2023B LDT Schedule

(Most column headers include added "mouse over" information.)
July 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Sat Jul-01 14.1 b b 98% 98% 20:48-00:28 00:28-04:09 0.0 / 3.7 0.0 / 3.7 0.5 0.5 E02 Y01 Ellsworth-Bowers Brewer Remote Remote DEVENY EXPRES DV1 (150g/mm,5000A) IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Sun Jul-02 14.3 b b 100% 100% 20:48-02:19 02:19-04:09 0.0 / 5.5 0.0 / 1.8 0.75 0.25 E02 Y01 Ellsworth-Bowers Brewer Remote Remote DEVENY EXPRES DV1 (150g/mm,5000A) IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Mon Jul-03 13.3 b b 99% 99% 20:48-02:20 02:20-04:10 0.0 / 5.5 0.0 / 1.8 0.75 0.25 E02 Y01 Ellsworth-Bowers Brewer Remote Remote DEVENY EXPRES DV1 (150g/mm,5000A) IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Tue Jul-04 12.3 b b 95% 94% 20:47-02:19 02:19-04:10 0.1 / 5.5 0.0 / 1.9 0.75 0.25 E02 Y01 Ellsworth-Bowers Brewer Remote Remote DEVENY EXPRES DV1 (150g/mm,5000A) IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Wed Jul-05 11.3 g b 89% 87% 20:47-03:49 03:49-04:11 0.8 / 7.0 0.0 / 0.4 0.95 0.05 E02 L25 Ellsworth-Bowers Schleicher Remote Remote DEVENY LMI DV1 (150g/mm,5000A) VR,R,CN,BC BM CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Thu Jul-06 10.3 g b b 80% 79% 79% 20:47-00:29 00:29-02:21 02:21-04:12 1.4 / 3.7 0.0 / 1.9 0.0 / 1.9 0.5 0.25 0.25 B05 Y01 L03 Brout Brewer Llama Remote Remote Remote DEVENY EXPRES EXPRES DV2 (300g/mm,4000A) BM CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Fri Jul-07 9.3 D g g 0% 70% 69% 20:47-22:38 22:38-00:29 00:29-04:12 1.2 / 1.9 0.7 / 1.9 0.0 / 3.7 0.25 0.25 0.5 L07 L03 L23 Devogele Llama Ellsworth-Bowers Remote Remote Remote LMI EXPRES DEVENY,LMI VR,OPEN DV6 (600g/mm,4900A),B,V,u,g,r,i BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV6 (600g/mm,4900A)
Sat Jul-08 8.3 g 58% 20:46-04:13 2.4 / 7.5 1.0 N03 Thomas Remote DEVENY,LMI VR,DV1 (150g/mm) BS BM OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Sun Jul-09 7.3 D 47% 20:46-04:14 2.9 / 7.5 1.0 T01 Rosenwasser Remote DEVENY DV4 BS JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV4 (400g/mm,8500A)
Mon Jul-10 6.3 D 36% 20:45-04:14 3.3 / 7.5 1.0 E04 Shutdown n/a n/a n/a
Tue Jul-11 5.3 D 26% 20:45-04:15 3.9 / 7.5 1.0 E04 Shutdown n/a n/a n/a
Wed Jul-12 4.3 D 17% 20:44-04:16 4.5 / 7.5 1.0 E04 Shutdown n/a n/a n/a
Thu Jul-13 3.3 D 10% 20:44-04:17 5.1 / 7.5 1.0 E04 Shutdown n/a n/a n/a
Fri Jul-14 2.3 D 5% 20:43-04:17 5.9 / 7.6 1.0 E04 Shutdown n/a n/a n/a
Sat Jul-15 1.3 D 2% 20:43-04:18 6.3 / 7.6 1.0 E04 Shutdown n/a n/a n/a
Sun Jul-16 0.3 D 0% 20:42-04:19 6.4 / 7.6 1.0 E04 Shutdown n/a n/a n/a
Mon Jul-17 0.4 D 0% 20:42-04:20 6.4 / 7.6 1.0 E04 Shutdown n/a n/a n/a
Tue Jul-18 1.4 D 0% 20:41-04:21 6.4 / 7.7 1.0 E04 Shutdown n/a n/a n/a
Wed Jul-19 2.4 D 5% 20:40-04:21 6.5 / 7.7 1.0 E04 Shutdown n/a BM BS n/a n/a
Thu Jul-20 3.4 D 10% 20:40-04:22 6.1 / 7.7 1.0 E04 Shutdown n/a BM BS n/a n/a
Fri Jul-21 4.4 D 17% 20:39-04:23 5.7 / 7.7 1.0 E04 Shutdown n/a BM BS n/a n/a
Sat Jul-22 5.4 D 24% 20:38-04:24 5.3 / 7.8 1.0 E04 Shutdown n/a IN BS n/a n/a
Sun Jul-23 6.4 D 33% 20:37-04:25 5.0 / 7.8 1.0 E04 Shutdown n/a IN BS n/a n/a
Mon Jul-24 7.4 D 43% 20:36-04:26 4.6 / 7.8 1.0 E01 Engineering LMI r BS OBS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Tue Jul-25 8.4 g D 52% 53% 20:35-21:35 21:35-04:27 0.0 / 1.0 4.1 / 6.9 0.13 0.87 E01 M05 Engineering Hammerstein Remote LMI DEVENY,LMI r u,g,r,i,z,DV2 (300g/mm,4000A) BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Wed Jul-26 9.4 g 64% 20:35-04:28 3.6 / 7.9 1.0 B03 Muirhead Remote DEVENY DV9 (1200g/mm) BM JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV9 (1200g/mm,5000A)
Thu Jul-27 10.4 b D 74% 74% 20:34-00:31 00:31-04:28 0.0 / 4.0 3.0 / 4.0 0.5 0.5 Y01 L23 Brewer Ellsworth-Bowers Remote Remote EXPRES DEVENY,LMI DV6 (600g/mm,4900A),u,g,r,i BM JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV6 (600g/mm,4900A)
Fri Jul-28 11.4 b D 83% 83% 20:33-00:31 00:31-04:29 0.0 / 4.0 2.2 / 4.0 0.5 0.5 Y01 L23 Brewer Ellsworth-Bowers Remote Remote EXPRES DEVENY,LMI DV6 (600g/mm,4900A),u,g,r,i BM JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV6 (600g/mm,4900A)
Sat Jul-29 12.4 b g 91% 91% 20:32-00:31 00:31-04:30 0.0 / 4.0 1.3 / 4.0 0.5 0.5 Y01 B05 Brewer Brout Remote Remote EXPRES DEVENY DV2 (300g/mm,4000A) IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Sun Jul-30 13.4 b 97% 20:31-04:31 0.1 / 8.0 1.0 E01 Engineering LMI r CS JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Mon Jul-31 14.4 b 100% 20:30-04:32 0.0 / 8.0 1.0 E01 Engineering LMI r CS JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)

August 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Tue Aug-01 14.0 b 99% 20:29-04:33 0.0 / 8.1 1.0 E01 Engineering LMI r CS BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Wed Aug-02 13.0 b b 97% 96% 20:28-00:30 00:30-04:34 0.0 / 4.0 0.0 / 4.1 0.5 0.5 E01 E01 Engineering Engineering LMI LMI r r BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Thu Aug-03 12.0 b b 91% 90% 20:26-00:31 00:31-04:35 0.3 / 4.1 0.0 / 4.1 0.5 0.5 E01 E01 Engineering Engineering LMI LMI r r BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Fri Aug-04 11.0 g b 83% 82% 20:25-00:30 00:30-04:36 0.8 / 4.1 0.0 / 4.1 0.5 0.5 L24 E01 Levine Engineering Remote GWAVES,POETS,LMI LMI VR,RC,r r BM IN OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Sat Aug-05 10.0 g 73% 20:24-04:37 1.3 / 8.2 1.0 E02 Ellsworth-Bowers Remote DEVENY DV1 (150g/mm,5000A) IN JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV1 (150g/mm,5000A)
Sun Aug-06 9.0 g g 62% 61% 20:23-02:34 02:34-04:38 1.8 / 6.2 0.0 / 2.1 0.75 0.25 E01 Y01 Engineering Brewer Remote LMI EXPRES r IN JF OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Mon Aug-07 8.0 D g 51% 51% 20:22-00:30 00:30-04:39 2.3 / 4.1 0.0 / 4.2 0.5 0.5 N05 Y01 Trilling Brewer On-Site Remote LMI EXPRES g,r,i,z IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Tue Aug-08 7.0 D 41% 20:21-04:40 2.9 / 8.3 1.0 B02 Muirhead Remote DEVENY DV3 (300g/mm) CS BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV3 (300g/mm,6750A)
Wed Aug-09 6.0 D 31% 20:20-04:41 3.6 / 8.3 1.0 B03 Muirhead Remote DEVENY DV9 (1200g/mm) BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV9 (1200g/mm,5000A)
Thu Aug-10 5.0 D D D 0% 22% 21% 20:18-00:30 00:30-02:35 02:35-04:41 3.6 / 4.2 0.7 / 2.1 0.0 / 2.1 0.5 0.25 0.25 T01 L07 L03 Rosenwasser Devogele Llama Remote Remote Remote DEVENY LMI EXPRES DV4 VR,OPEN BM BS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV4 (400g/mm,8500A)
Fri Aug-11 4.0 D D 0% 14% 20:17-00:29 00:29-04:42 3.6 / 4.2 1.6 / 4.2 0.5 0.5 T01 Y01 Rosenwasser Brewer Remote Remote DEVENY EXPRES DV4 BM ES OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV4 (400g/mm,8500A)
Sat Aug-12 3.0 D D 0% 8% 20:16-00:30 00:30-04:43 3.7 / 4.2 2.5 / 4.2 0.5 0.5 N09 B05 Oldroyd Brout Remote Remote LMI DEVENY VR,g,r,i DV2 (300g/mm,4000A) IN ES OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Sun Aug-13 2.0 D 3% 20:15-04:44 7.2 / 8.5 1.0 L17 Wasserman Remote LMI VR IN CS OPEN DARK OH C3 BC I R V B UC OPEN u g r i z CN RC VR C2 DV2 (300g/mm,4000A)
Mon Aug-14 1.0 D D 0% 0% 20:13-00:29 00:29-04:45 3.7 / 4.3 3.7 / 4.3 0.5 0.5 E01 L14 Engineering Massey Remote LMI DEVENY,EXPRES,LMI r WC,WN,CT,B,V,R,DV5 IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Tue Aug-15 0.0 D D 0% 0% 20:12-00:29 00:29-04:46 3.7 / 4.3 3.8 / 4.3 0.5 0.5 L24 L23 Levine Ellsworth-Bowers Remote Remote GWAVES,POETS,LMI DEVENY,LMI VR,RC,r DV6 (600g/mm,4900A),B,V,u,g,r,i CS BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV6 (600g/mm,4900A)
Wed Aug-16 1.0 D D D 0% 0% 0% 20:11-22:20 22:20-00:29 00:29-04:47 1.6 / 2.1 2.1 / 2.1 3.8 / 4.3 0.25 0.25 0.5 L07 L03 L14 Devogele Llama Massey Remote Remote Remote LMI EXPRES DEVENY,EXPRES,LMI VR,OPEN WC,WN,CT,B,V,R,DV5 BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Thu Aug-17 2.0 D D 0% 0% 20:09-00:29 00:29-04:48 3.8 / 4.3 3.8 / 4.3 0.5 0.5 Y01 L14 Brewer Massey Remote Remote EXPRES DEVENY,EXPRES,LMI WC,WN,CT,B,V,R,DV5 BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Fri Aug-18 3.0 D 6% 20:08-04:49 7.6 / 8.7 1.0 T03 Fodor Remote DEVENY DV5 (500g/mm 5500A) BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Sat Aug-19 4.0 D 12% 20:07-04:50 7.4 / 8.7 1.0 T03 Fodor Remote DEVENY DV5 (500g/mm 5500A) IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Sun Aug-20 5.0 D 19% 20:05-04:51 7.0 / 8.8 1.0 T03 Fodor Remote DEVENY DV5 (500g/mm 5500A) IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Mon Aug-21 6.0 D 28% 20:04-04:51 6.6 / 8.8 1.0 M05 Hammerstein Remote DEVENY,LMI u,g,r,i,z,DV2 (300g/mm,4000A) IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Tue Aug-22 7.0 D D 37% 0% 20:02-00:27 00:27-04:52 2.2 / 4.4 3.9 / 4.4 0.5 0.5 L03 L14 Llama Massey Remote Remote EXPRES DEVENY,EXPRES,LMI WC,WN,CT,B,V,R,DV5 CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Wed Aug-23 8.0 g D 48% 0% 20:01-00:27 00:27-04:53 1.7 / 4.4 3.9 / 4.4 0.5 0.5 Y01 L14 Brewer Massey Remote Remote EXPRES DEVENY,EXPRES,LMI WC,WN,CT,B,V,R,DV5 BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Thu Aug-24 9.0 g D 59% 0% 20:00-00:27 00:27-04:54 1.0 / 4.5 3.9 / 4.5 0.5 0.5 E01 L14 Engineering Massey Remote QWSSI DEVENY,EXPRES,LMI WC,WN,CT,B,V,R,DV5 BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Fri Aug-25 10.0 g g g D 69% 69% 70% 0% 19:58-22:12 22:18-22:48 22:12-00:27 00:27-04:55 0.0 / 2.2 0.0 / 0.5 0.1 / 2.2 4.0 / 4.5 0.25 0.06 0.25 0.5 L04 M01 L16 L14 Sikora Andreoni van Belle Massey Remote ToO Remote Remote EXPRES DEVENY,LMI EXPRES DEVENY,EXPRES,LMI u,g,r,i,z WC,WN,CT,B,V,R,DV5 BM IN OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Sat Aug-26 11.0 b D 80% 80% 19:57-00:26 00:26-04:56 0.0 / 4.5 3.0 / 4.5 0.5 0.5 E01 B05 Engineering Brout Remote LMI DEVENY r DV2 (300g/mm,4000A) IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Sun Aug-27 12.0 g b 89% 88% 19:55-04:57 22:04-23:04 1.9 / 9.0 0.0 / 1.0 1.0 0.11 L18 M01 Richey-Yowell Andreoni Remote ToO EXPRES DEVENY,LMI u,g,r,i,z IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Mon Aug-28 13.0 b 95% 19:54-04:58 0.6 / 9.1 1.0 L15 van Belle Remote QWSSI IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Tue Aug-29 14.0 b 99% 19:52-04:58 0.0 / 9.1 1.0 L15 van Belle Remote QWSSI CS BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Wed Aug-30 14.8 b b 100% 100% 19:51-04:59 22:02-22:32 0.0 / 9.1 0.0 / 0.5 1.0 0.05 L13 M01 Horch Andreoni Remote ToO QWSSI DEVENY,LMI 577nm,658nm,808nm,880nm u,g,r,i,z BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Thu Aug-31 13.8 b 98% 19:50-05:00 0.0 / 9.2 1.0 L13 Horch Remote QWSSI 577nm,658nm,808nm,880nm BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)

September 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Fri Sep-01 12.8 b 93% 19:48-05:01 0.0 / 9.2 1.0 L18 Richey-Yowell Remote EXPRES BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Sat Sep-02 11.8 b b 86% 86% 19:47-05:02 23:00-23:30 0.4 / 9.2 0.0 / 0.5 1.0 0.05 L18 M01 Richey-Yowell Andreoni Remote ToO EXPRES DEVENY,LMI u,g,r,i,z IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Sun Sep-03 10.8 g 77% 19:45-05:03 1.0 / 9.3 1.0 L04 Sikora Remote EXPRES IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Mon Sep-04 9.8 D D g g 67% 0% 67% 65% 19:44-22:04 19:44-20:14 22:04-02:43 02:43-05:03 1.6 / 2.3 0.0 / 0.5 0.0 / 4.7 0.0 / 2.3 0.25 0.05 0.5 0.25 L07 M03 N07 Y01 Devogele Ye Emery Brewer Remote ToO Remote Remote LMI DEVENY,LMI,NIHTS LMI EXPRES VR,OPEN OH,CN,BC,RC,DV2 (300g/mm) g,r,i,z,VR IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Tue Sep-05 8.8 g D 57% 0% 19:42-05:04 21:00-21:30 2.2 / 9.4 0.5 / 0.5 1.0 0.05 L17 M01 Wasserman Andreoni Remote ToO LMI DEVENY,LMI VR u,g,r,i,z CS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV2 (300g/mm,4000A)
Wed Sep-06 7.8 D g 46% 46% 19:41-00:23 00:23-05:05 3.0 / 4.7 0.0 / 4.7 0.5 0.5 L08 B06 Kareta Schmidt Remote Remote LMI DEVENY g,r,i,z,CN,CO+,BC DV3 (300g/mm 6750A) BM JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV3 (300g/mm,6750A)
Thu Sep-07 6.8 D 36% 19:39-05:06 3.8 / 9.4 1.0 L04 Sikora Remote EXPRES BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV2 (300g/mm,4000A)
Fri Sep-08 5.8 D D 27% 0% 19:38-05:07 21:00-21:30 4.8 / 9.5 0.5 / 0.5 1.0 0.05 B07 M01 Ould Rouis Andreoni Remote ToO DEVENY DEVENY,LMI DV2 (300g/mm,4000A) u,g,r,i,z BS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV2 (300g/mm,4000A)
Sat Sep-09 4.8 D D 0% 18% 19:36-00:22 00:22-05:08 4.2 / 4.8 1.5 / 4.8 0.5 0.5 B05 L06 Brout Kunovac Remote Remote DEVENY EXPRES DV2 (300g/mm,4000A) IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV2 (300g/mm,4000A)
Sun Sep-10 3.8 D D 0% 11% 19:35-00:21 00:21-05:08 4.3 / 4.8 2.5 / 4.8 0.5 0.5 L01 L08 Moskovitz Kareta Remote Remote DEVENY,LMI,NIHTS DEVENY u,g,r,i,z,VR,DV1 (150g/mm) DV1 IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR CT DV1 (150g/mm,5000A)
Mon Sep-11 2.8 D D 0% 6% 19:33-00:21 00:21-05:09 4.3 / 4.8 3.5 / 4.8 0.5 0.5 L24 L14 Levine Massey Remote Remote GWAVES,POETS,LMI DEVENY,EXPRES,LMI VR,RC,r WC,WN,CT,B,V,R,DV5 CS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV5 (500g/mm,5500A)
Tue Sep-12 1.8 D D 0% 2% 19:32-21:56 21:56-05:10 1.9 / 2.4 6.8 / 7.2 0.25 0.75 Y01 L06 Brewer Kunovac Remote Remote EXPRES EXPRES CS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Wed Sep-13 0.8 D D 0% 0% 19:30-00:21 00:21-05:11 4.3 / 4.8 4.3 / 4.8 0.5 0.5 L03 B06 Llama Schmidt Remote Remote EXPRES DEVENY DV3 (300g/mm 6750A) BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV3 (300g/mm,6750A)
Thu Sep-14 0.2 b D D 0% 0% 0% 18:59-19:29 19:29-05:11 05:11-05:41 0.0 / 0.0 8.7 / 9.7 0.0 / 0.0 0. 1.0 0. L10 L11 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Fri Sep-15 1.2 D D 0% 0% 19:27-00:20 00:20-05:12 4.4 / 4.9 4.4 / 4.9 0.5 0.5 E02 B01 Ellsworth-Bowers Saunders Remote Remote DEVENY POETS DV1 (150g/mm,5000A) B,R,z,890nm BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV1 (150g/mm,5000A)
Sat Sep-16 2.2 D b D 0% 4% 0% 19:26-00:19 18:40-19:09 00:19-05:13 4.4 / 4.9 0.0 / 0.0 4.4 / 4.9 0.5 0.05 0.5 L24 M03 B01 Levine Ye Saunders Remote ToO Remote GWAVES,POETS,LMI DEVENY,LMI,NIHTS POETS VR,r,890nm OH,CN,BC,RC,DV2 (300g/mm) B,R,z,890nm BS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV1 (150g/mm,5000A)
Sun Sep-17 3.2 D b D 8% 8% 0% 19:24-00:19 18:41-19:02 00:19-05:14 4.4 / 4.9 0.0 / 0.0 4.4 / 4.9 0.5 0.05 0.5 Y01 M03 L08 Brewer Ye Kareta Remote ToO Remote EXPRES DEVENY,LMI,NIHTS DEVENY OH,CN,BC,RC,DV2 (300g/mm) DV1 IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV1 (150g/mm,5000A)
Mon Sep-18 4.2 D D 15% 0% 19:23-05:15 21:00-21:30 8.5 / 9.9 0.5 / 0.5 1.0 0.05 M06 M01 Bauer Andreoni Remote ToO LMI DEVENY,LMI g,r,i,VR,OH,CN,BC,RC,C2,C3 u,g,r,i,z IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR CT DV2 (300g/mm,4000A)
Tue Sep-19 5.2 D 23% 19:21-05:15 8.0 / 9.9 1.0 M05 Hammerstein Remote DEVENY,LMI u,g,r,i,z,DV2 (300g/mm,4000A) CS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR CT DV2 (300g/mm,4000A)
Wed Sep-20 6.2 D 32% 19:20-05:16 7.3 / 9.9 1.0 L04 Sikora Remote EXPRES BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR CT DV2 (300g/mm,4000A)
Thu Sep-21 7.2 D D 43% 0% 19:18-00:18 00:18-05:17 2.1 / 5.0 4.5 / 5.0 0.5 0.5 L01 M08 Moskovitz Ye Remote Remote DEVENY,LMI,NIHTS LMI,NIHTS u,g,r,i,z,VR,DV1 (150g/mm) g,r,i,z,VR,OH,CN,BC,RC,C2,C3,UC BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Fri Sep-22 8.2 g g D 54% 54% 0% 19:17-21:47 21:47-00:17 00:17-05:18 0.0 / 2.5 1.1 / 2.5 4.5 / 5.0 0.25 0.25 0.5 L03 L07 B06 Llama Devogele Schmidt Remote Remote Remote EXPRES LMI DEVENY VR,OPEN DV3 (300g/mm 6750A) BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)
Sat Sep-23 9.2 g D 66% 0% 19:15-00:17 00:17-05:18 0.0 / 5.0 4.5 / 5.0 0.5 0.5 B05 L06 Brout Kunovac Remote Remote DEVENY EXPRES DV2 (300g/mm,4000A) CS BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sun Sep-24 10.2 g 77% 19:14-05:19 3.4 / 10.1 1.0 L04 Sikora Remote EXPRES IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Mon Sep-25 11.2 b g 86% 86% 19:12-00:16 00:16-05:20 0.0 / 5.1 2.1 / 5.1 0.5 0.5 Y01 L06 Brewer Kunovac Remote Remote EXPRES EXPRES IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Sep-26 12.2 b g 94% 94% 19:11-02:49 02:49-05:21 0.0 / 7.6 0.9 / 2.5 0.75 0.25 L06 Y01 Kunovac Brewer Remote Remote EXPRES EXPRES IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Sep-27 13.2 b b b 98% 98% 99% 19:10-00:15 00:15-02:49 02:49-05:22 0.0 / 5.1 0.0 / 2.6 0.0 / 2.5 0.5 0.25 0.25 E01 L03 B04 Engineering Llama Ye Remote Remote LMI EXPRES EXPRES r BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Sep-28 14.2 b b b 100% 100% 100% 19:08-21:42 21:42-02:48 02:48-05:22 0.0 / 2.6 0.0 / 5.1 0.0 / 2.6 0.25 0.5 0.25 L21 E01 B04 Hanley Engineering Ye Remote Remote EXPRES,NIHTS LMI EXPRES r BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Sep-29 14.4 b b 99% 99% 19:07-00:15 00:15-05:23 0.0 / 5.1 0.0 / 5.1 0.5 0.5 E01 B06 Engineering Schmidt Remote LMI DEVENY r DV3 (300g/mm 6750A) BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)
Sat Sep-30 13.4 b b 96% 95% 19:05-00:15 00:15-05:24 0.0 / 5.2 0.0 / 5.2 0.5 0.5 E01 L06 Engineering Kunovac Remote LMI EXPRES r BS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)

October 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Sun Oct-01 12.4 g b b b 90% 89% 89% 88% 19:04-21:39 21:39-00:14 00:14-02:50 02:50-05:25 0.2 / 2.6 0.0 / 2.6 0.0 / 2.6 0.0 / 2.6 0.25 0.25 0.25 0.25 L07 E01 L03 Y01 Devogele Engineering Llama Brewer Remote Remote Remote LMI LMI EXPRES EXPRES VR,OPEN r IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Mon Oct-02 11.4 g b 82% 81% 19:02-00:14 00:14-05:25 0.8 / 5.2 0.0 / 5.2 0.5 0.5 L06 L19 Kunovac Iyer Remote Remote EXPRES DEVENY DV1 (150g/mm,5000A),OG570 IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Tue Oct-03 10.4 g 73% 19:01-05:26 1.6 / 10.4 1.0 L04 Sikora Remote EXPRES IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Oct-04 9.4 g g 63% 62% 19:00-00:13 00:13-05:27 2.4 / 5.2 0.0 / 5.2 0.5 0.5 B05 Y01 Brout Brewer Remote Remote DEVENY EXPRES DV2 (300g/mm,4000A) BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Oct-05 8.4 g 53% 18:58-05:28 3.3 / 10.5 1.0 B07 Ould Rouis Remote DEVENY DV8 BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV8 (831g/mm,8000A)
Fri Oct-06 7.4 D g 42% 42% 18:57-00:12 00:12-05:28 4.3 / 5.2 0.0 / 5.3 0.5 0.5 L24 Y01 Levine Brewer Remote Remote GWAVES,POETS,LMI EXPRES VR,RC,r BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sat Oct-07 6.4 D D g 0% 33% 32% 18:56-21:34 21:34-02:51 02:51-05:29 2.1 / 2.6 3.1 / 5.3 0.0 / 2.6 0.25 0.5 0.25 L07 B05 Y01 Devogele Brout Brewer Remote Remote Remote LMI DEVENY EXPRES VR,OPEN DV2 (300g/mm,4000A) BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sun Oct-08 5.4 D D 0% 24% 18:54-00:12 00:12-05:30 4.8 / 5.3 1.5 / 5.3 0.5 0.5 L14 B06 Massey Schmidt Remote Remote EXPRES,LMI DEVENY WC,WN,CT,B,V,R DV3 (300g/mm 6750A) IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV3 (300g/mm,6750A)
Mon Oct-09 4.4 D 16% 18:53-05:31 7.3 / 10.6 1.0 L01 Moskovitz Remote DEVENY,LMI,NIHTS u,g,r,i,z,VR,DV1 (150g/mm) IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV1 (150g/mm,5000A)
Tue Oct-10 3.4 D D D 0% 0% 10% 18:52-21:32 21:32-02:51 02:51-05:31 2.2 / 2.7 5.3 / 5.3 0.8 / 2.7 0.25 0.5 0.25 L21 L08 E01 Hanley Kareta Engineering Remote Remote EXPRES,NIHTS DEVENY LMI DV1 r IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV1 (150g/mm,5000A)
Wed Oct-11 2.4 D 5% 18:50-05:32 9.2 / 10.7 1.0 B07 Ould Rouis Remote DEVENY DV2 (300g/mm,4000A) BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Thu Oct-12 1.4 b D D 0% 1% 1% 18:20-18:49 18:49-05:33 05:33-06:02 0.0 / 0.0 9.8 / 10.7 0.0 / 0.0 0. 1.0 0. L10 L11 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Fri Oct-13 0.4 b D D 0% 0% 0% 18:19-18:48 18:48-04:34 04:34-05:34 0.0 / 0.0 9.3 / 9.8 0.5 / 1.0 0. 0.91 0.09 L10 L11 B04 Thirouin Thirouin Ye Remote Remote Remote LMI LMI EXPRES VR,r VR,g,r,i,z BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Sat Oct-14 0.6 D D 0% 0% 18:47-04:35 04:35-05:35 9.3 / 9.8 0.5 / 1.0 0.91 0.09 M05 B04 Hammerstein Ye Remote Remote DEVENY,LMI EXPRES u,g,r,i,z,DV2 (300g/mm,4000A) BS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Sun Oct-15 1.6 D D 0% 0% 18:45-04:35 04:35-05:35 9.3 / 9.8 0.5 / 1.0 0.91 0.09 L12 B04 Grundy Ye Remote Remote LMI EXPRES VR,g,r,i,z IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z WC WN VR CT DV2 (300g/mm,4000A)
Mon Oct-16 2.6 D D 5% 0% 18:44-00:10 00:10-05:36 5.0 / 5.4 5.0 / 5.4 0.5 0.5 L14 L08 Massey Kareta Remote Remote DEVENY,EXPRES,LMI LMI WC,WN,CT,B,V,R,DV5 g,r,i,z,CN,CO+,BC IN CS OPEN DARK OH C3 BC CO+ R V B RC OPEN CN g r i z WC WN VR CT DV5 (500g/mm,5500A)
Tue Oct-17 3.6 D 11% 18:43-05:37 9.7 / 10.9 1.0 L24 Levine Remote GWAVES,POETS,LMI VR,r,890nm BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR CT DV2 (300g/mm,4000A)
Wed Oct-18 4.6 b D D 18% 19% 0% 18:12-18:42 18:42-05:38 05:38-06:07 0.0 / 0.0 9.0 / 10.9 0.0 / 0.0 0. 1.0 0. L10 L11 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR CT DV2 (300g/mm,4000A)
Thu Oct-19 5.6 D 28% 18:41-05:38 8.1 / 10.9 1.0 L12 Grundy Remote LMI VR,g,r,i,z BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR CT DV2 (300g/mm,4000A)
Fri Oct-20 6.6 D 39% 18:39-05:39 7.1 / 11.0 1.0 L17 Wasserman Remote LMI VR BS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR CT DV2 (300g/mm,4000A)
Sat Oct-21 7.6 g D 51% 0% 18:38-00:09 00:09-05:40 0.9 / 5.5 5.0 / 5.5 0.5 0.5 E02 M08 Ellsworth-Bowers Ye Remote Remote DEVENY LMI,NIHTS DV1 (150g/mm,5000A) g,r,i,z,VR,OH,CN,BC,RC,C2,C3,UC BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR UC DV1 (150g/mm,5000A)
Sun Oct-22 8.6 g D 62% 62% 18:37-00:09 00:09-05:41 0.0 / 5.5 4.8 / 5.5 0.5 0.5 L23 E01 Ellsworth-Bowers Engineering Remote DEVENY,LMI LMI DV6 (600g/mm,4900A),B,V,u,g,r,i r IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN WN VR UC DV6 (600g/mm,4900A)
Mon Oct-23 9.6 g 74% 18:36-05:42 3.5 / 11.1 1.0 B07 Ould Rouis Remote DEVENY DV2 (300g/mm,4000A) IN CS OPEN DARK OH C3 BC I R V B U OPEN u g r i z CN WN VR Oiii DV2 (300g/mm,4000A)
Tue Oct-24 10.6 g 84% 18:35-05:42 2.4 / 11.1 1.0 B03 Muirhead Remote DEVENY DV9 (1200g/mm) CS JF OPEN DARK OH C3 BC I R V B U OPEN u g r i z CN WN VR Oiii DV9 (1200g/mm,5000A)
Wed Oct-25 11.6 b 92% 18:34-05:43 1.2 / 11.2 1.0 T04 Smith On-Site LMI,DEVENY DV5 (+GG420),HαOn,HαOff,U,B,V,R,I BM OBS OPEN DARK OH C3 BC I R V B U OPEN u g r i z HαOn HαOff VR Oiii DV5 (500g/mm,5500A)
Thu Oct-26 12.6 b 97% 18:33-05:44 0.1 / 11.2 1.0 L05 Archer Remote LMI V BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z HαOn HαOff VR Oiii DV2 (300g/mm,4000A)
Fri Oct-27 13.6 b 100% 18:32-05:45 0.0 / 11.2 1.0 L05 Archer Remote LMI V BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z HαOn HαOff VR UC DV2 (300g/mm,4000A)
Sat Oct-28 14.6 b b 100% 100% 18:31-00:09 00:09-05:46 0.0 / 5.6 0.0 / 5.6 0.5 0.5 E01 E01 Engineering Engineering LMI LMI r r IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Sun Oct-29 14.1 b 98% 18:30-05:47 0.0 / 11.3 1.0 E01 Engineering LMI r IN JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Mon Oct-30 13.1 b 94% 18:29-05:47 0.0 / 11.3 1.0 E02 Ellsworth-Bowers Remote DEVENY DV1 (150g/mm,5000A) CS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Tue Oct-31 12.1 b 87% 18:28-05:48 0.7 / 11.3 1.0 B08 Hermes On-Site DEVENY DV4 CS OBS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV4 (400g/mm,8500A)

November 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Wed Nov-01 11.1 g b 79% 78% 18:27-00:08 00:08-05:49 1.6 / 5.7 0.0 / 5.7 0.5 0.5 L23 E02 Ellsworth-Bowers Ellsworth-Bowers Remote Remote DEVENY,LMI DEVENY DV6 (600g/mm,4900A),B,V,u,g,r,i DV1 (150g/mm,5000A) BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV6 (600g/mm,4900A)
Thu Nov-02 10.1 D g g 0% 70% 68% 18:26-21:17 21:17-04:50 04:50-05:50 2.4 / 2.9 0.2 / 7.5 0.0 / 1.0 0.25 0.66 0.09 L21 L23 M07 Hanley Ellsworth-Bowers Ye Remote Remote Remote EXPRES,NIHTS DEVENY,LMI LMI DV6 (600g/mm,4900A),B,V,u,g,r,i r BM JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV6 (600g/mm,4900A)
Fri Nov-03 9.1 D g g 0% 60% 58% 18:26-21:17 21:17-04:51 04:51-05:51 2.4 / 2.9 1.2 / 7.6 0.0 / 1.0 0.25 0.66 0.09 N01 L08 M07 Trujillo Kareta Ye On-Site Remote Remote LMI LMI LMI,DEVENY VR,V,I,g,r g,r,i,z,CN,CO+,BC r,DV1 BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Sat Nov-04 8.1 D g g 0% 50% 48% 18:25-21:17 21:17-04:52 04:52-05:52 2.4 / 2.9 2.2 / 7.6 0.0 / 1.0 0.25 0.66 0.09 N01 L01 M07 Trujillo Moskovitz Ye On-Site Remote Remote LMI DEVENY,LMI,NIHTS LMI,DEVENY VR,V,I,g,r u,g,r,i,z,VR,DV1 (150g/mm) r,DV1 BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Sun Nov-05 7.1 D g 0% 40% 18:24-00:08 00:08-05:52 5.2 / 5.7 0.3 / 5.7 0.5 0.5 M08 E02 Ye Ellsworth-Bowers Remote Remote LMI,NIHTS DEVENY g,r,i,z,VR,OH,CN,BC,RC,C2,C3,UC DV1 (150g/mm,5000A) BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Mon Nov-06 6.1 D D D g 0% 0% 31% 30% 18:23-21:15 21:15-00:08 00:08-05:53 04:29-05:09 2.4 / 2.9 2.9 / 2.9 1.3 / 5.8 0.0 / 0.7 0.25 0.25 0.5 0.06 L21 E01 L19 M01 Hanley Engineering Iyer Andreoni Remote Remote ToO EXPRES,NIHTS LMI DEVENY DEVENY,LMI r DV1 (150g/mm,5000A),OG570 u,g,r,i,z BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Tue Nov-07 5.1 D D 0% 22% 18:22-21:15 21:15-05:54 2.4 / 2.9 5.1 / 8.7 0.25 0.75 L21 E01 Hanley Engineering Remote EXPRES,NIHTS LMI r CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Nov-08 4.1 D D D 0% 0% 15% 18:22-21:15 21:15-00:09 00:09-05:55 2.4 / 2.9 2.9 / 2.9 3.2 / 5.8 0.25 0.25 0.5 B04 L07 E01 Ye Devogele Engineering Remote Remote EXPRES LMI LMI VR,OPEN r BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Nov-09 3.1 D D 0% 8% 18:21-21:15 21:15-05:56 2.4 / 2.9 7.0 / 8.7 0.25 0.75 B04 B02 Ye Muirhead Remote Remote EXPRES DEVENY DV3 (300g/mm) BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)
Fri Nov-10 2.1 D D 0% 3% 18:20-00:09 00:09-05:57 5.3 / 5.8 5.1 / 5.8 0.5 0.5 M04 L08 Ricotti Kareta Remote Remote LMI LMI V,I g,r,i,z,CN,CO+,BC BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Sat Nov-11 1.1 D D 0% 0% 18:20-00:08 00:08-05:58 5.3 / 5.8 5.3 / 5.8 0.5 0.5 M04 L01 Ricotti Moskovitz Remote Remote LMI DEVENY,LMI,NIHTS V,I u,g,r,i,z,VR,DV1 (150g/mm) IN GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Sun Nov-12 0.1 D D 0% 0% 18:19-00:09 00:09-05:58 5.3 / 5.8 5.3 / 5.8 0.5 0.5 M04 M05 Ricotti Hammerstein Remote Remote LMI DEVENY,LMI V,I u,g,r,i,z,DV2 (300g/mm,4000A) IN JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Mon Nov-13 0.9 D D 0% 0% 18:18-00:09 00:09-05:59 5.3 / 5.8 5.3 / 5.8 0.5 0.5 M04 E02 Ricotti Ellsworth-Bowers Remote Remote LMI DEVENY V,I DV1 (150g/mm,5000A) IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Tue Nov-14 1.9 D 0% 18:18-06:00 10.7 / 11.7 1.0 N08 Tegler Remote LMI B,V,R CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Wed Nov-15 2.9 D 8% 18:17-06:01 10.6 / 11.7 1.0 N08 Tegler Remote LMI B,V,R BM CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Thu Nov-16 3.9 D 15% 18:17-06:02 9.6 / 11.8 1.0 L17 Wasserman Remote LMI VR BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Fri Nov-17 4.9 D D 25% 24% 18:16-06:03 18:47-19:44 8.4 / 11.8 0.0 / 0.9 1.0 0.08 B07 M01 Ould Rouis Andreoni Remote ToO DEVENY DEVENY,LMI DV2 (300g/mm,4000A) u,g,r,i,z BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV2 (300g/mm,4000A)
Sat Nov-18 5.9 D D 35% 0% 18:16-00:10 00:10-06:04 1.9 / 5.9 5.4 / 5.9 0.5 0.5 L08 N09 Kareta Oldroyd Remote Remote DEVENY LMI DV1 VR,g,r,i IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Sun Nov-19 6.9 D g 47% 46% 18:15-06:05 19:24-20:23 6.1 / 11.8 0.0 / 1.0 1.0 0.08 N03 M01 Thomas Andreoni Remote ToO DEVENY,LMI DEVENY,LMI DV1 (150g/mm) u,g,r,i,z IN JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN CO+ VR UC DV1 (150g/mm,5000A)
Mon Nov-20 7.9 g D 59% 59% 18:15-00:11 00:11-06:05 0.0 / 5.9 4.9 / 5.9 0.5 0.5 L22 M08 Hanley Ye Remote Remote EXPRES,NIHTS LMI,NIHTS g,r,i,z,VR,OH,CN,BC,RC,C2,C3,UC CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Nov-21 8.9 g D 70% 71% 18:15-00:10 00:10-06:06 0.0 / 5.9 3.8 / 5.9 0.5 0.5 L22 N06 Hanley Strauss Remote Remote EXPRES,NIHTS LMI VR CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Nov-22 9.9 b g 80% 81% 18:14-00:11 00:11-06:07 0.0 / 6.0 2.7 / 5.9 0.5 0.5 L22 E02 Hanley Ellsworth-Bowers Remote Remote EXPRES,NIHTS DEVENY DV1 (150g/mm,5000A) BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Thu Nov-23 10.9 b b g 88% 89% 89% 18:14-21:12 21:12-03:10 03:10-06:08 0.0 / 3.0 0.0 / 6.0 1.6 / 3.0 0.25 0.5 0.25 E01 N07 L07 Engineering Emery Devogele Remote Remote LMI LMI LMI r g,r,i,z,VR VR,OPEN BM BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Nov-24 11.9 b 95% 18:14-06:09 0.4 / 11.9 1.0 L04 Sikora Remote EXPRES BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sat Nov-25 12.9 b b 98% 99% 18:14-00:11 00:11-06:10 0.0 / 6.0 0.0 / 6.0 0.5 0.5 L22 E01 Hanley Engineering Remote EXPRES,NIHTS LMI r BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sun Nov-26 13.9 b b 100% 100% 18:13-00:12 00:12-06:10 0.0 / 6.0 0.0 / 6.0 0.5 0.5 E01 E01 Engineering Engineering LMI LMI r r CS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Mon Nov-27 14.8 b b 99% 99% 18:13-00:12 00:12-06:11 0.0 / 6.0 0.0 / 6.0 0.5 0.5 L22 E01 Hanley Engineering Remote EXPRES,NIHTS LMI r CS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Nov-28 13.8 b 97% 18:13-06:12 0.0 / 12.0 1.0 L18 Richey-Yowell Remote EXPRES CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Nov-29 12.8 b 92% 18:13-06:13 0.5 / 12.0 1.0 L18 Richey-Yowell Remote EXPRES BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Nov-30 11.8 g 85% 18:13-06:14 1.5 / 12.0 1.0 B03 Muirhead Remote DEVENY DV3 BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)

December 2023 - LDT
DoW Date Moon days Dark Code Max moon Illum Time Range (MST) No moon/ night hrs Frac night Prog ID Principal Remote Instrument Requested Filters/Gratings TO Intended LMI Filter Setup Intended DeVeny Grating
Fri Dec-01 10.8 g 77% 18:13-06:15 2.5 / 12.0 1.0 B07 Ould Rouis Remote DEVENY DV8 BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV8 (831g/mm,8000A)
Sat Dec-02 9.8 D g 68% 67% 18:13-00:14 00:14-06:15 3.5 / 6.0 0.0 / 6.0 0.5 0.5 B06 B02 Schmidt Muirhead Remote Remote DEVENY DEVENY DV3 (300g/mm 6750A) DV3 (300g/mm) BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)
Sun Dec-03 8.8 g 58% 18:13-06:16 4.5 / 12.1 1.0 N02 Trilling On-Site DEVENY,LMI g,r,i,z,DV1 IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Mon Dec-04 7.8 D g 49% 48% 18:13-03:16 03:16-06:17 5.5 / 9.1 0.0 / 3.0 0.75 0.25 L06 Y01 Kunovac Brewer Remote Remote EXPRES EXPRES IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Dec-05 6.8 D g g 0% 39% 38% 18:13-00:15 00:15-05:18 05:18-06:18 5.5 / 6.0 0.9 / 5.0 0.0 / 1.0 0.5 0.42 0.08 M08 E02 M07 Ye Ellsworth-Bowers Ye Remote Remote Remote LMI,NIHTS DEVENY LMI g,r,i,z,VR,OH,CN,BC,RC,C2,C3,UC DV1 (150g/mm,5000A) r CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Wed Dec-06 5.8 D g 30% 29% 18:13-05:18 05:18-06:18 7.3 / 11.1 0.0 / 1.0 0.92 0.08 L17 M07 Wasserman Ye Remote Remote LMI LMI VR r CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Dec-07 4.8 b D D 0% 21% 20% 17:41-18:13 18:13-05:19 05:19-06:19 0.0 / 0.0 8.3 / 11.1 0.0 / 1.0 0. 0.92 0.08 L10 L09 M07 Thirouin Thirouin Ye Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z r BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Dec-08 3.8 D 13% 18:13-06:20 9.3 / 12.1 1.0 M06 Bauer Remote LMI g,r,i,VR,OH,CN,BC,RC,C2,C3 BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sat Dec-09 2.8 D 7% 18:13-06:21 10.4 / 12.1 1.0 T03 Fodor Remote DEVENY DV5 (500g/mm 5500A) BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV5 (500g/mm,5500A)
Sun Dec-10 1.8 D 2% 18:13-06:21 11.1 / 12.1 1.0 T03 Fodor Remote DEVENY DV5 (500g/mm 5500A) IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV5 (500g/mm,5500A)
Mon Dec-11 0.8 b D D 0% 0% 0% 17:42-18:14 18:14-06:22 06:22-06:53 0.0 / 0.0 11.1 / 12.1 0.0 / 0.0 0. 1.0 0. L10 L11 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Dec-12 0.2 b D D 0% 0% 0% 17:42-18:14 18:14-06:23 06:23-06:54 0.0 / 0.0 11.1 / 12.2 0.0 / 0.0 0. 1.0 0. L10 L11 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r CS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Dec-13 1.2 D 0% 18:14-06:23 11.2 / 12.2 1.0 B07 Ould Rouis Remote DEVENY DV2 (300g/mm,4000A) BM ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Dec-14 2.2 D D 6% 0% 18:14-21:16 21:16-06:24 2.4 / 3.0 8.6 / 9.1 0.25 0.75 Y01 L06 Brewer Kunovac Remote Remote EXPRES EXPRES BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Dec-15 3.2 D D D 12% 0% 0% 18:15-21:17 21:17-00:20 00:20-06:25 1.2 / 3.0 3.0 / 3.0 5.6 / 6.1 0.25 0.25 0.5 N01 L07 T02 Trujillo Devogele Donnelly On-Site Remote On-Site LMI LMI DEVENY VR,V,I,g,r VR,OPEN DV5 (500g/mm) BM JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV5 (500g/mm,5500A)
Sat Dec-16 4.2 D D D 21% 21% 0% 18:15-21:17 21:17-00:20 00:20-06:25 0.0 / 3.0 3.0 / 3.0 5.6 / 6.1 0.25 0.25 0.5 N01 Y01 T02 Trujillo Brewer Donnelly On-Site Remote On-Site LMI EXPRES DEVENY VR,V,I,g,r DV5 (500g/mm) BS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV5 (500g/mm,5500A)
Sun Dec-17 5.2 D D 32% 0% 18:15-00:21 00:21-06:26 1.8 / 6.1 5.6 / 6.1 0.5 0.5 N05 T02 Trilling Donnelly Remote On-Site LMI DEVENY g,r,i,z DV5 (500g/mm) IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV5 (500g/mm,5500A)
Mon Dec-18 6.2 g D 44% 0% 18:16-00:22 00:22-06:26 0.7 / 6.1 5.6 / 6.1 0.5 0.5 B06 B02 Schmidt Muirhead Remote Remote DEVENY DEVENY DV3 (300g/mm 6750A) DV3 (300g/mm) CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV3 (300g/mm,6750A)
Tue Dec-19 7.2 g D 55% 55% 18:16-00:22 00:22-06:27 0.0 / 6.1 5.1 / 6.1 0.5 0.5 L01 N04 Moskovitz Emery Remote Remote DEVENY,LMI,NIHTS DEVENY u,g,r,i,z,VR,DV1 (150g/mm) DV1 CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Wed Dec-20 8.2 b g D 64% 67% 0% 17:45-18:17 18:17-06:27 06:27-06:59 0.0 / 0.0 4.0 / 12.2 0.0 / 0.0 0. 1.0 0. L10 L09 L10 Thirouin Thirouin Thirouin Remote Remote Remote LMI LMI LMI VR,r VR,g,r,i,z VR,r CS JJ OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Dec-21 9.2 g 77% 18:17-06:28 2.9 / 12.2 1.0 M05 Hammerstein Remote DEVENY,LMI u,g,r,i,z,DV2 (300g/mm,4000A) JF IN OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Dec-22 10.2 b b g 84% 85% 86% 18:18-21:20 21:20-00:23 00:23-06:28 0.0 / 3.0 0.0 / 3.0 1.8 / 6.1 0.25 0.25 0.5 L16 Y01 N04 van Belle Brewer Emery Remote Remote Remote EXPRES EXPRES DEVENY DV1 BS JF OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)
Sat Dec-23 11.2 b 93% 18:18-06:29 0.7 / 12.2 1.0 L20 Richey-Yowell Remote DEVENY DV8 (831g/mm,8000A),OG570 BS KK OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV8 (831g/mm,8000A)
Sun Dec-24 12.2 b b 97% 96% 18:19-06:29 21:12-22:12 0.0 / 12.2 0.0 / 1.0 1.0 0.08 E01 M01 Engineering Andreoni ToO LMI DEVENY,LMI r u,g,r,i,z IN BS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Mon Dec-25 13.2 b b b 99% 99% 100% 18:19-00:25 00:25-03:27 03:27-06:30 0.0 / 6.1 0.0 / 3.0 0.0 / 3.0 0.5 0.25 0.25 E01 L16 B04 Engineering van Belle Ye Remote Remote LMI EXPRES EXPRES r IN CS OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Tue Dec-26 14.2 b b b b 100% 100% 100% 100% 18:20-21:22 21:22-00:25 00:25-03:28 03:28-06:30 0.0 / 3.0 0.0 / 3.0 0.0 / 3.0 0.0 / 3.0 0.25 0.25 0.25 0.25 E01 L16 Y01 B04 Engineering van Belle Brewer Ye Remote Remote Remote LMI EXPRES EXPRES EXPRES r CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Wed Dec-27 14.1 b b b 99% 98% 98% 18:21-21:23 21:23-03:28 03:28-06:30 0.0 / 3.0 0.0 / 6.1 0.0 / 3.0 0.25 0.5 0.25 L16 E01 Y01 van Belle Engineering Brewer Remote Remote EXPRES LMI EXPRES r CS ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Thu Dec-28 13.1 b b b 95% 95% 94% 18:21-21:23 21:23-03:29 03:29-06:31 0.2 / 3.0 0.0 / 6.1 0.0 / 3.0 0.25 0.5 0.25 L16 L01 Y01 van Belle Moskovitz Brewer Remote Remote Remote EXPRES DEVENY,LMI,NIHTS EXPRES u,g,r,i,z,VR,DV1 (150g/mm) IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Fri Dec-29 12.1 g b b 90% 90% 89% 18:22-21:24 21:24-00:26 00:26-06:31 1.2 / 3.0 0.0 / 3.0 0.0 / 6.1 0.25 0.25 0.5 L07 L16 L20 Devogele van Belle Richey-Yowell Remote Remote Remote LMI EXPRES DEVENY VR,OPEN DV8 (831g/mm,8000A),OG570 IN ES OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV8 (831g/mm,8000A)
Sat Dec-30 11.1 g b b b 84% 83% 83% 82% 18:22-00:27 00:27-01:27 00:27-03:29 03:29-06:31 2.2 / 6.1 0.0 / 1.0 0.0 / 3.0 0.0 / 3.0 0.5 0.08 0.25 0.25 L12 M01 L16 Y01 Grundy Andreoni van Belle Brewer Remote ToO Remote Remote LMI DEVENY,LMI EXPRES EXPRES VR,g,r,i,z u,g,r,i,z BS GM OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV2 (300g/mm,4000A)
Sun Dec-31 10.1 g b b 76% 75% 74% 18:23-00:27 00:27-03:30 03:30-06:32 3.1 / 6.1 0.0 / 3.0 0.0 / 3.0 0.5 0.25 0.25 L12 Y01 E01 Grundy Brewer Engineering Remote Remote LMI EXPRES LMI VR,g,r,i,z r BS VST OPEN DARK OH C3 BC I R V B RC OPEN u g r i z CN C2 VR UC DV1 (150g/mm,5000A)

Note: Half-night handover times are calculated for local astronomical midnight.

Note: Nominal night duration is from Nautical Twilight (12deg) to Nautical Twilight.

Program ID codes: L=Lowell, B=BU, G=UT/KASI(IGRINS), M=UMd/GSFC, N=NAU, NL=Joint NAU/Lowell, T=UToledo, X=External, Y=Yale, E=Engineering

Dark code (D=dark, g=gray, b=bright) methodology: At a time resolution of 1 minute, calculate the fractional illumination of the moon for the allocated time (ignoring time during astronomical/nautical/civil twilights & setting to zero for when the moon is below the horizon). Determine the dark code from the mean value of this metric where D=dark for <={0}, g=gray for <={1}, and b=bright for >0.7.

Remote: If entry is "Remote Requested", then remote observing request is pending and not yet approved. If entry is "Remote" then remote request is approved. If entry is blank, or is "On-Site", then observers are expected to be on-site at LDT.

Bolded red items are Time Critical Observations, during which ToO interrupts will not be accepted.

Italicized gray items are engineering optional interrupts (EOI) for brief testing. Principal will be notified before the start of the prior night if any of this time will be used for a quick engineering test.

2023B Approved Target of Opportunity (ToO) Programs
Program ID Principal ToO Type Time Allocated (hours) Time Remaining (hours) Requested Instrument & Filters/Grating
L02 Moskovitz Slow 6.00 6.00 DEVENY,LMI,NIHTS: u,g,r,i,z,VR,DV1 (150g/mm,preferred) or DV2 (300g/mm)
L07 Devogele Slow 2.00 2.00 LMI: VR,OPEN
L08 Kareta Slow 4.00 4.00 LMI,DEVENY: g,r,i,z,CN,CO+,BC,DV1
L10 Thirouin Slow 2.00 2.00 LMI: ,VR,r'
M01 Andreoni Rapid 8.00 8.00 DEVENY,LMI: u,g,r,i,z,DV2 (300g/mm,4000A)
M01 Andreoni Slow 24.00 15.00 DEVENY,LMI: u,g,r,i,z
M02 Cenko Rapid 2.00 2.00 DEVENY,LMI: DV2
M03 Ye Slow 2.00 0.50 DEVENY,LMI,NIHTS: OH,CN,BC,RC,DV2 (300g/mm)
M07 Ye Rapid 3.00 3.00 LMI: r
Totals 53.00 42.50

On nights when the DeVeny is not in use, it should be left in the following configuration in order to be ready for ToO programs:

	Grating: DV2 (300 lines / mm, 4000A blaze)
	Grating tilt: 22.28
	Collimator Focus: 11.25 mm
	Slit Width: 1.5" (0.23 mm)
	Rear Filter Wheel: Clear
	Front Filter Wheel: Clear

Targets of Opportunity (ToO) requests: 1) will only be accepted for approved ToO programs. 2) will not be accepted during any Time Critical Observation (TCO). 3) May be requested during engineering time (programs designated ENN), but will be accepted, delayed, or rejected at the discretion of the Principal or Lead Engineer for that engineering time. Click here to link to LDT policies regarding ToO programs.

Operations Staff (Position) email at lowell.edu:
    Timothy Ellsworth-Bowers (SuppAst) TB; tbowers@
    Jose Fernandez (LDTNtOpsMgr) JF; jfernandez@
    Jane Jedlink (Safety) JJ; jjedlink@
    Kyler Kuehn (DirTech) KK; kkuehn@
    Stephen Levine (Ast/TelSci/DirEd) SL; sel@
    Beck Maier (TelOp) BM; emaier@
    Gavin Moriarty (Safety) GM; gmoriarty@
    Ishara Nisley (TelOp) IN; inisley@
    Observer (Observer) OBS;
    Ben Shafransky (TelOp) BS; bshafransky@
    Cecilia Siqueiros (TelOp) CS; csiqueiros@
    Evelyn Starling (Safety) ES; estarling@
    Visitor (Visitor) VST;

Summary of dates on which approved programs are scheduled (note some dates are partial nights):
B01 Saunders           2023-09-15, 2023-09-16
B02 Muirhead           2023-08-08, 2023-11-09, 2023-12-02, 2023-12-18
B03 Muirhead           2023-07-26, 2023-08-09, 2023-10-24, 2023-11-30
B04 Ye                 2023-09-27, 2023-09-28, 2023-10-13, 2023-10-14, 2023-10-15, 2023-11-08
                       2023-11-09, 2023-12-25, 2023-12-26
B05 Brout              2023-07-06, 2023-07-29, 2023-08-12, 2023-08-26, 2023-09-09, 2023-09-23
                       2023-10-04, 2023-10-07
B06 Schmidt            2023-09-06, 2023-09-13, 2023-09-22, 2023-09-29, 2023-10-08, 2023-12-02
                       2023-12-18
B07 Ould Rouis         2023-09-08, 2023-10-05, 2023-10-11, 2023-10-23, 2023-11-17, 2023-12-01
                       2023-12-13
B08 Hermes             2023-10-31
L01 Moskovitz          2023-09-10, 2023-09-21, 2023-10-09, 2023-11-04, 2023-11-11, 2023-12-19
                       2023-12-28
L02 Moskovitz          
L03 Llama              2023-07-06, 2023-07-07, 2023-08-10, 2023-08-16, 2023-08-22, 2023-09-13
                       2023-09-22, 2023-09-27, 2023-10-01
L04 Sikora             2023-08-25, 2023-09-03, 2023-09-07, 2023-09-20, 2023-09-24, 2023-10-03
                       2023-11-24
L05 Archer             2023-10-26, 2023-10-27
L06 Kunovac            2023-09-09, 2023-09-12, 2023-09-23, 2023-09-25, 2023-09-26, 2023-09-30
                       2023-10-02, 2023-12-04, 2023-12-14
L07 Devogele           2023-07-07, 2023-08-10, 2023-08-16, 2023-09-04, 2023-09-22, 2023-10-01
                       2023-10-07, 2023-11-08, 2023-11-23, 2023-12-15, 2023-12-29
L08 Kareta             2023-09-06, 2023-09-10, 2023-09-17, 2023-10-10, 2023-10-16, 2023-11-03
                       2023-11-10, 2023-11-18
L09 Thirouin           2023-12-07, 2023-12-20
L10 Thirouin           2023-09-14, 2023-10-12, 2023-10-13, 2023-10-18, 2023-12-07, 2023-12-11
                       2023-12-12, 2023-12-20
L11 Thirouin           2023-09-14, 2023-10-12, 2023-10-13, 2023-10-18, 2023-12-11, 2023-12-12
L12 Grundy             2023-10-15, 2023-10-19, 2023-12-30, 2023-12-31
L13 Horch              2023-08-30, 2023-08-31
L14 Massey             2023-08-14, 2023-08-16, 2023-08-17, 2023-08-22, 2023-08-23, 2023-08-24
                       2023-08-25, 2023-09-11, 2023-10-08, 2023-10-16
L15 van Belle          2023-08-28, 2023-08-29
L16 van Belle          2023-08-25, 2023-12-22, 2023-12-25, 2023-12-26, 2023-12-27, 2023-12-28
                       2023-12-29, 2023-12-30
L17 Wasserman          2023-08-13, 2023-09-05, 2023-10-20, 2023-11-16, 2023-12-06
L18 Richey-Yowell      2023-08-27, 2023-09-01, 2023-09-02, 2023-11-28, 2023-11-29
L19 Iyer               2023-10-02, 2023-11-06
L20 Richey-Yowell      2023-12-23, 2023-12-29
L21 Hanley             2023-09-28, 2023-10-10, 2023-11-02, 2023-11-06, 2023-11-07
L22 Hanley             2023-11-20, 2023-11-21, 2023-11-22, 2023-11-25, 2023-11-27
L23 Ellsworth-Bowers   2023-07-07, 2023-07-27, 2023-07-28, 2023-08-15, 2023-10-22, 2023-11-01
                       2023-11-02
L24 Levine             2023-08-04, 2023-08-15, 2023-09-11, 2023-09-16, 2023-10-06, 2023-10-17
L25 Schleicher         2023-07-05
M01 Andreoni           2023-08-25, 2023-08-27, 2023-08-30, 2023-09-02, 2023-09-05, 2023-09-08
                       2023-09-18, 2023-11-06, 2023-11-17, 2023-11-19, 2023-12-24, 2023-12-30
M02 Cenko              
M03 Ye                 2023-09-04, 2023-09-16, 2023-09-17
M04 Ricotti            2023-11-10, 2023-11-11, 2023-11-12, 2023-11-13
M05 Hammerstein        2023-07-25, 2023-08-21, 2023-09-19, 2023-10-14, 2023-11-12, 2023-12-21
M06 Bauer              2023-09-18, 2023-12-08
M07 Ye                 2023-11-02, 2023-11-03, 2023-11-04, 2023-12-05, 2023-12-06, 2023-12-07
M08 Ye                 2023-09-21, 2023-10-21, 2023-11-05, 2023-11-20, 2023-12-05
N01 Trujillo           2023-11-03, 2023-11-04, 2023-12-15, 2023-12-16
N02 Trilling           2023-12-03
N03 Thomas             2023-07-08, 2023-11-19
N04 Emery              2023-12-19, 2023-12-22
N05 Trilling           2023-08-07, 2023-12-17
N06 Strauss            2023-11-21
N07 Emery              2023-09-04, 2023-11-23
N08 Tegler             2023-11-14, 2023-11-15
N09 Oldroyd            2023-08-12, 2023-11-18
T01 Rosenwasser        2023-07-09, 2023-08-10, 2023-08-11
T02 Donnelly           2023-12-15, 2023-12-16, 2023-12-17
T03 Fodor              2023-08-18, 2023-08-19, 2023-08-20, 2023-12-09, 2023-12-10
T04 Smith              2023-10-25
Y01 Brewer             2023-07-01, 2023-07-02, 2023-07-03, 2023-07-04, 2023-07-06, 2023-07-27
                       2023-07-28, 2023-07-29, 2023-08-06, 2023-08-07, 2023-08-11, 2023-08-17
                       2023-08-23, 2023-09-04, 2023-09-12, 2023-09-17, 2023-09-25, 2023-09-26
                       2023-10-01, 2023-10-04, 2023-10-06, 2023-10-07, 2023-12-04, 2023-12-14
                       2023-12-16, 2023-12-22, 2023-12-26, 2023-12-27, 2023-12-28, 2023-12-30
                       2023-12-31
E01 Engineering        2023-07-24, 2023-07-25, 2023-07-30, 2023-07-31, 2023-08-01, 2023-08-02
                       2023-08-03, 2023-08-04, 2023-08-06, 2023-08-14, 2023-08-24, 2023-08-26
                       2023-09-27, 2023-09-28, 2023-09-29, 2023-09-30, 2023-10-01, 2023-10-10
                       2023-10-22, 2023-10-28, 2023-10-29, 2023-11-06, 2023-11-07, 2023-11-08
                       2023-11-23, 2023-11-25, 2023-11-26, 2023-11-27, 2023-12-24, 2023-12-25
                       2023-12-26, 2023-12-27, 2023-12-31
E02 Ellsworth-Bowers   2023-07-01, 2023-07-02, 2023-07-03, 2023-07-04, 2023-07-05, 2023-08-05
                       2023-09-15, 2023-10-21, 2023-10-30, 2023-11-01, 2023-11-05, 2023-11-13
                       2023-11-22, 2023-12-05
E04 Shutdown           2023-07-10, 2023-07-11, 2023-07-12, 2023-07-13, 2023-07-14, 2023-07-15
                       2023-07-16, 2023-07-17, 2023-07-18, 2023-07-19, 2023-07-20, 2023-07-21
                       2023-07-22, 2023-07-23

ID  PI Name            Title
B01 Saunders           Uranus Upper Atmospheric Temperatures from a Stellar Occultation
B02 Muirhead           A Fresh Look at M-Dwarfs: Fundamental Properties of Mid-to-Late M dwarfs using Atmospheric Retrievals
B03 Muirhead           Brief but Spectacular: New Windows into the Physics of Common Envelope Evolution
B04 Ye                 Linewidth Resolved Spectra of Bright Cometary Comae with EXPRES
B05 Brout              Facilitating the Current Generation of Low-Redshift Supernova Cosmology.
B06 Schmidt            The Temporal Variability of Solid State O2 on Europa
B07 Ould Rouis         Discerning merger remnants among field white dwarfs
B08 Hermes             AS709
L01 Moskovitz          The Mission Accessible Near-Earth Object Survey (MANOS)
L02 Moskovitz          NEO Rapid Response: Close Encounters of the Asteroid Kind
L03 Llama              Yale Exoplanet Survey
L04 Sikora             Phase-Resolved Emission Spectroscopy of the Ultra-hot Juipter MASCARA-5 b
L05 Archer             Updating the Ephemerides of Transiting Exoplanets with Exoplanet Watch
L06 Kunovac            Exploring the origins of sub-Neptune planets by measuring stellar obliquities
L07 Devogele           Second lunation NEO follow-up
L08 Kareta             The Eventually Mission Accessible Centaur Survey (EMACS)
L09 Thirouin           Physical Characterization of Main Belt Comets
L10 Thirouin           Twilight Asteroids: Target of Opportunity and Survey
L11 Thirouin           The fraction of contact binaries in the trans-Neptunian belt
L12 Grundy             Mutual events in the trans-Neptunian belt
L13 Horch              Toward New Orbits and Masses of Nearby Low Mass Binary Stars with QWSSI
L14 Massey             A Deep Search for Wolf-Rayet Stars in M31, Take II
L15 van Belle          Bowling for Turkeys: Searching for Triple Systems in Young Disk Wide Binaries
L16 van Belle          A Search of Stellar Companions for Non-Transiting Planets
L17 Wasserman          Astrometric Measures of Centaurs and Kuiper Belt Object
L18 Richey-Yowell      Optical Flare Rate and Magnetic Activity Indicator Relationships of K Stars
L19 Iyer               Metallicites of Hyades Cluster M-dwarfs
L20 Richey-Yowell      Determining the Evolution of K Dwarf Chromospheres with Age and Rotation
L21 Hanley             Constraining the vertical abundances of haze and methane on Titan
L22 Hanley             Salts on Europa's Surface
L23 Ellsworth-Bowers   Young Open Clusters as Tracers of Galactic Environment
L24 Levine             Occultations of Bodies in the Outer Solar System
L25 Schleicher         The Complex Rotational State of Comet 103P/Hartley 2 and How it is Changing
M01 Andreoni           ToO Observations of Gravitational Wave Counterparts in the Fourth LIGO-Virgo-KAGRA Observing Run
M02 Cenko              Target of Opportunity Transient Follow-Up with LDT
M03 Ye                 ToO for Unanticipated Solar System Phenomena
M04 Ricotti            Gathering Data on Ghostly Halos
M05 Hammerstein        Classically Scheduled Imaging and Spectroscopy of Transients and Their Host Galaxies
M06 Bauer              Observations of CO + CO2 Active Comets Observed by NEOWISE - Year 11B
M07 Ye                 Observations of near-Sun comets
M08 Ye                 Observations of Comets and Asteroids
N01 Trujillo           Recovery of Extreme trans-Neptunian Objects in search of a Distant Massive Planet
N02 Trilling           Observations of mission-target asteroids
N03 Thomas             Red Main Belt Asteroids
N04 Emery              A search for hydrated material on red objects
N05 Trilling           Follow-up of interesting asteroids detected in ZTF/SNAPS
N06 Strauss            Follow-up lightcurve observations of an eclipsing binary asteroid
N07 Emery              Colors of small Polana asteroid family members
N08 Tegler             Is the Outer Solar System Red Stuff Destroyed Within 5 AU of the Sun?
N09 Oldroyd            Confirmation and Characterization of Unusual Active Bodies
T01 Rosenwasser        Spectroscopy of the HSC Polar Ring Catalog
T02 Donnelly           Can't Take the Heat: Looking for Relationships Between Optical Emission Lines and Dust Emission
T03 Fodor              Early Warning Signs of Quenching
T04 Smith              ASTR4880
Y01 Brewer             Yale Exoplanet Survey
E01 Engineering        Night Engineering
E02 Ellsworth-Bowers   ENGINEERING: Measuring the Atmospheric Extinction at LDT
E04 Shutdown           Summer Shutdown
New users needing training:
2023-07-06: B05 Brout: Brout is a new LDT and DeVeny user.
2023-08-25: L04 Sikora: Sikora is a new user.  Will be trained on EXPRES by J. Llama.
2023-10-02: L19 Iyer: Iyer is a new user, who will be trained by Richey-Yowell.
2023-10-26: L05 Archer: Zellem is a new observer.
2023-11-02: M07 Ye: Q. Zhang is a new user.
2023-11-10: M04 Ricotti: K. Hamilton-Campos is a new observer.
2023-12-03: N02 Trilling: New DeVeny users.
2023-12-15: T02 Donnelly: Donnelly will be new on-site observer (has observed remotely before).

Latest as of 2023-12-31T18:10:54.474417 UTC