2027A LDT Schedule

(Most column headers include added "mouse over" information.)

January 2027 - 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	Jan-01	5.7	D D	0% 24%	18:24-00:28 00:28-06:32	5.5 / 6.1 2.8 / 6.1	0.5 0.5	tbd tbd					IN OW
Sat	Jan-02	4.7	D D	0% 16%	18:25-00:29 00:29-06:32	5.6 / 6.1 3.8 / 6.0	0.5 0.5	tbd tbd					IN OW
Sun	Jan-03	3.7	D D	0% 9%	18:25-00:29 00:29-06:32	5.5 / 6.1 4.8 / 6.0	0.5 0.5	tbd tbd					IN
Mon	Jan-04	2.7	D D	0% 5%	18:26-00:29 00:29-06:32	5.5 / 6.0 5.6 / 6.0	0.5 0.5	tbd tbd					CS
Tue	Jan-05	1.7	D D	0% 0%	18:27-00:29 00:29-06:32	5.5 / 6.0 5.6 / 6.0	0.5 0.5	tbd tbd					BM
Wed	Jan-06	0.7	D D	0% 0%	18:28-00:30 00:30-06:33	5.5 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					BM CS
Thu	Jan-07	0.3	D D	0% 0%	18:28-00:31 00:31-06:33	5.5 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					BM OW
Fri	Jan-08	1.3	D D	0% 0%	18:29-00:31 00:31-06:33	5.5 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					IN OW
Sat	Jan-09	2.3	D D	4% 0%	18:30-00:31 00:31-06:33	5.2 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					IN OW
Sun	Jan-10	3.3	D D	9% 0%	18:31-00:31 00:31-06:33	4.2 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					IN
Mon	Jan-11	4.3	D D	15% 0%	18:32-00:32 00:32-06:33	3.3 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					CS
Tue	Jan-12	5.3	D D	24% 0%	18:32-00:33 00:33-06:33	2.3 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					CS
Wed	Jan-13	6.3	D D	33% 0%	18:33-00:32 00:32-06:32	1.3 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					BM CS
Thu	Jan-14	7.3	g D	43% 0%	18:34-00:33 00:33-06:32	0.3 / 6.0 5.5 / 6.0	0.5 0.5	tbd tbd					BM OW
Fri	Jan-15	8.3	g D	54% 54%	18:35-00:34 00:34-06:32	0.0 / 6.0 4.8 / 6.0	0.5 0.5	tbd tbd					IN OW
Sat	Jan-16	9.3	g D	65% 66%	18:36-00:34 00:34-06:32	0.0 / 6.0 3.6 / 6.0	0.5 0.5	tbd tbd					IN OW
Sun	Jan-17	10.3	b g	75% 77%	18:37-00:34 00:34-06:32	0.0 / 6.0 2.4 / 6.0	0.5 0.5	tbd tbd					IN
Mon	Jan-18	11.3	b g	85% 86%	18:38-00:35 00:35-06:31	0.0 / 6.0 1.2 / 5.9	0.5 0.5	tbd tbd
Tue	Jan-19	12.3	b b	92% 94%	18:38-00:35 00:35-06:31	0.0 / 6.0 0.1 / 5.9	0.5 0.5	tbd tbd
Wed	Jan-20	13.3	b b	98% 98%	18:39-00:35 00:35-06:31	0.0 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Thu	Jan-21	14.3	b b	100% 100%	18:40-00:36 00:36-06:31	0.0 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Fri	Jan-22	14.3	b b	99% 99%	18:41-00:35 00:35-06:30	0.0 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Sat	Jan-23	13.3	b b	96% 95%	18:42-00:36 00:36-06:30	0.4 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Sun	Jan-24	12.3	g b	90% 89%	18:43-00:36 00:36-06:29	1.6 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Mon	Jan-25	11.3	g b	81% 80%	18:44-00:36 00:36-06:29	2.7 / 5.9 0.0 / 5.9	0.5 0.5	tbd tbd
Tue	Jan-26	10.3	D g	71% 71%	18:45-00:37 00:37-06:28	3.7 / 5.9 0.0 / 5.8	0.5 0.5	tbd tbd
Wed	Jan-27	9.3	D g	61% 61%	18:46-00:36 00:36-06:28	4.8 / 5.8 0.0 / 5.9	0.5 0.5	tbd tbd
Thu	Jan-28	8.3	D g	0% 50%	18:47-00:37 00:37-06:27	5.3 / 5.8 0.5 / 5.8	0.5 0.5	tbd tbd
Fri	Jan-29	7.3	D g	0% 40%	18:47-00:37 00:37-06:27	5.3 / 5.8 1.5 / 5.8	0.5 0.5	tbd tbd
Sat	Jan-30	6.3	D D	0% 31%	18:48-00:37 00:37-06:26	5.3 / 5.8 2.5 / 5.8	0.5 0.5	tbd tbd
Sun	Jan-31	5.3	D D	0% 22%	18:49-00:38 00:38-06:26	5.3 / 5.8 3.5 / 5.8	0.5 0.5	tbd tbd

February 2027 - 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
Mon	Feb-01	4.3	D D	0% 14%	18:50-00:37 00:37-06:25	5.3 / 5.8 4.3 / 5.8	0.5 0.5	tbd tbd
Tue	Feb-02	3.3	D D	0% 8%	18:51-00:38 00:38-06:24	5.3 / 5.8 5.1 / 5.8	0.5 0.5	tbd tbd
Wed	Feb-03	2.3	D D	0% 4%	18:52-00:37 00:37-06:24	5.2 / 5.8 5.3 / 5.8	0.5 0.5	tbd tbd
Thu	Feb-04	1.3	D D	0% 0%	18:53-00:38 00:38-06:23	5.2 / 5.8 5.3 / 5.8	0.5 0.5	tbd tbd
Fri	Feb-05	0.3	D D	0% 0%	18:54-00:38 00:38-06:22	5.2 / 5.7 5.3 / 5.7	0.5 0.5	tbd tbd
Sat	Feb-06	0.7	D D	0% 0%	18:55-00:38 00:38-06:21	5.2 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Sun	Feb-07	1.7	D D	2% 0%	18:56-00:38 00:38-06:21	5.2 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Mon	Feb-08	2.7	D D	5% 0%	18:57-00:38 00:38-06:20	4.5 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Tue	Feb-09	3.7	D D	11% 0%	18:57-00:38 00:38-06:19	3.5 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Wed	Feb-10	4.7	D D	18% 0%	18:58-00:38 00:38-06:18	2.5 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Thu	Feb-11	5.7	D D	28% 0%	18:59-00:38 00:38-06:17	1.5 / 5.7 5.2 / 5.7	0.5 0.5	tbd tbd
Fri	Feb-12	6.7	g D	38% 0%	19:00-00:38 00:38-06:16	0.4 / 5.6 5.2 / 5.6	0.5 0.5	tbd tbd
Sat	Feb-13	7.7	g D	49% 49%	19:01-00:38 00:38-06:15	0.0 / 5.6 4.4 / 5.6	0.5 0.5	tbd tbd
Sun	Feb-14	8.7	g D	60% 61%	19:02-00:38 00:38-06:14	0.0 / 5.6 3.2 / 5.6	0.5 0.5	tbd tbd
Mon	Feb-15	9.7	b g	71% 73%	19:03-00:38 00:38-06:13	0.0 / 5.6 2.1 / 5.6	0.5 0.5	tbd tbd
Tue	Feb-16	10.7	b g	81% 83%	19:04-00:38 00:38-06:12	0.0 / 5.6 1.1 / 5.6	0.5 0.5	tbd tbd
Wed	Feb-17	11.7	b b	90% 91%	19:04-00:38 00:38-06:11	0.0 / 5.6 0.2 / 5.5	0.5 0.5	tbd tbd
Thu	Feb-18	12.7	b b	96% 97%	19:05-00:38 00:38-06:10	0.0 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Fri	Feb-19	13.7	b b	99% 100%	19:06-00:37 00:37-06:09	0.0 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Sat	Feb-20	14.7	b b	100% 100%	19:07-00:38 00:38-06:08	0.0 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Sun	Feb-21	14.1	b b	98% 97%	19:08-00:37 00:37-06:07	0.0 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Mon	Feb-22	13.1	g b	93% 92%	19:09-00:38 00:38-06:06	1.0 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Tue	Feb-23	12.1	g b	86% 85%	19:10-00:37 00:37-06:05	2.1 / 5.5 0.0 / 5.5	0.5 0.5	tbd tbd
Wed	Feb-24	11.1	g b	78% 77%	19:11-00:38 00:38-06:04	3.2 / 5.5 0.0 / 5.4	0.5 0.5	tbd tbd
Thu	Feb-25	10.1	D g	68% 68%	19:11-00:36 00:36-06:03	4.2 / 5.4 0.0 / 5.5	0.5 0.5	tbd tbd
Fri	Feb-26	9.1	D g	0% 58%	19:12-00:37 00:37-06:01	4.9 / 5.4 0.3 / 5.4	0.5 0.5	tbd tbd
Sat	Feb-27	8.1	D g	0% 48%	19:13-00:36 00:36-06:00	4.9 / 5.4 1.3 / 5.4	0.5 0.5	tbd tbd
Sun	Feb-28	7.1	D D	0% 38%	19:14-00:37 00:37-05:59	4.9 / 5.4 2.2 / 5.4	0.5 0.5	tbd tbd

March 2027 - 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
Mon	Mar-01	6.1	D D	0% 29%	19:15-00:36 00:36-05:58	4.9 / 5.3 3.0 / 5.4	0.5 0.5	tbd tbd
Tue	Mar-02	5.1	D D	0% 21%	19:16-00:36 00:36-05:56	4.8 / 5.3 3.8 / 5.3	0.5 0.5	tbd tbd
Wed	Mar-03	4.1	D D	0% 13%	19:16-00:36 00:36-05:55	4.8 / 5.3 4.4 / 5.3	0.5 0.5	tbd tbd
Thu	Mar-04	3.1	D D	0% 8%	19:17-00:35 00:35-05:54	4.8 / 5.3 4.8 / 5.3	0.5 0.5	tbd tbd
Fri	Mar-05	2.1	D D	0% 0%	19:18-00:36 00:36-05:53	4.8 / 5.3 4.8 / 5.3	0.5 0.5	tbd tbd
Sat	Mar-06	1.1	D D	0% 0%	19:19-00:35 00:35-05:51	4.8 / 5.3 4.8 / 5.3	0.5 0.5	tbd tbd
Sun	Mar-07	0.1	D D	0% 0%	19:20-00:35 00:35-05:50	4.8 / 5.2 4.8 / 5.2	0.5 0.5	tbd tbd
Mon	Mar-08	0.9	D D	0% 0%	19:21-00:34 00:34-05:49	4.7 / 5.2 4.8 / 5.2	0.5 0.5	tbd tbd
Tue	Mar-09	1.9	D D	3% 0%	19:21-00:35 00:35-05:47	4.6 / 5.2 4.7 / 5.2	0.5 0.5	tbd tbd
Wed	Mar-10	2.9	D D	8% 0%	19:22-00:34 00:34-05:46	3.5 / 5.2 4.7 / 5.2	0.5 0.5	tbd tbd
Thu	Mar-11	3.9	D D	15% 0%	19:23-00:34 00:34-05:45	2.5 / 5.2 4.7 / 5.2	0.5 0.5	tbd tbd
Fri	Mar-12	4.9	D D	24% 0%	19:24-00:33 00:33-05:43	1.3 / 5.2 4.7 / 5.2	0.5 0.5	tbd tbd
Sat	Mar-13	5.9	g D	34% 0%	19:25-00:33 00:33-05:42	0.2 / 5.1 4.7 / 5.2	0.5 0.5	tbd tbd
Sun	Mar-14	6.9	g D	45% 46%	19:26-00:33 00:33-05:41	0.0 / 5.1 3.7 / 5.1	0.5 0.5	tbd tbd
Mon	Mar-15	7.9	g D	56% 57%	19:26-00:33 00:33-05:39	0.0 / 5.1 2.7 / 5.1	0.5 0.5	tbd tbd
Tue	Mar-16	8.9	g g	68% 69%	19:27-00:33 00:33-05:38	0.0 / 5.1 1.8 / 5.1	0.5 0.5	tbd tbd
Wed	Mar-17	9.9	b g	78% 80%	19:28-00:32 00:32-05:36	0.0 / 5.1 1.1 / 5.1	0.5 0.5	tbd tbd
Thu	Mar-18	10.9	b b	87% 88%	19:29-00:32 00:32-05:35	0.0 / 5.0 0.4 / 5.0	0.5 0.5	tbd tbd
Fri	Mar-19	11.9	b b	94% 95%	19:30-00:31 00:31-05:34	0.0 / 5.0 0.0 / 5.0	0.5 0.5	tbd tbd
Sat	Mar-20	12.9	b b	98% 99%	19:31-00:32 00:32-05:32	0.0 / 5.0 0.0 / 5.0	0.5 0.5	tbd tbd
Sun	Mar-21	13.9	b b	100% 100%	19:31-00:31 00:31-05:31	0.0 / 5.0 0.0 / 5.0	0.5 0.5	tbd tbd
Mon	Mar-22	14.8	b b	99% 99%	19:32-00:31 00:31-05:29	0.0 / 5.0 0.0 / 5.0	0.5 0.5	tbd tbd
Tue	Mar-23	13.8	b b	96% 95%	19:33-00:30 00:30-05:28	0.4 / 5.0 0.0 / 5.0	0.5 0.5	tbd tbd
Wed	Mar-24	12.8	g b	90% 90%	19:34-00:30 00:30-05:26	1.5 / 4.9 0.0 / 4.9	0.5 0.5	tbd tbd
Thu	Mar-25	11.8	g b	83% 83%	19:35-00:30 00:30-05:25	2.6 / 4.9 0.0 / 4.9	0.5 0.5	tbd tbd
Fri	Mar-26	10.8	D b	75% 75%	19:36-00:29 00:29-05:23	3.6 / 4.9 0.0 / 4.9	0.5 0.5	tbd tbd
Sat	Mar-27	9.8	D g	0% 66%	19:36-00:29 00:29-05:22	4.4 / 4.9 0.2 / 4.9	0.5 0.5	tbd tbd
Sun	Mar-28	8.8	D g	0% 56%	19:37-00:29 00:29-05:20	4.3 / 4.9 1.1 / 4.8	0.5 0.5	tbd tbd
Mon	Mar-29	7.8	D g	0% 46%	19:38-00:29 00:29-05:19	4.3 / 4.8 1.8 / 4.8	0.5 0.5	tbd tbd
Tue	Mar-30	6.8	D D	0% 37%	19:39-00:28 00:28-05:18	4.3 / 4.8 2.5 / 4.8	0.5 0.5	tbd tbd
Wed	Mar-31	5.8	D D	0% 28%	19:40-00:28 00:28-05:16	4.3 / 4.8 3.0 / 4.8	0.5 0.5	tbd tbd

April 2027 - 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
Thu	Apr-01	4.8	D D	0% 19%	19:41-00:27 00:27-05:15	4.3 / 4.8 3.5 / 4.8	0.5 0.5	tbd tbd
Fri	Apr-02	3.8	D D	0% 12%	19:42-00:28 00:28-05:13	4.3 / 4.8 4.0 / 4.8	0.5 0.5	tbd tbd
Sat	Apr-03	2.8	D D	0% 6%	19:43-00:27 00:27-05:12	4.2 / 4.7 4.2 / 4.8	0.5 0.5	tbd tbd
Sun	Apr-04	1.8	D D	0% 0%	19:43-00:27 00:27-05:10	4.2 / 4.7 4.2 / 4.7	0.5 0.5	tbd tbd
Mon	Apr-05	0.8	D D	0% 0%	19:44-00:27 00:27-05:09	4.2 / 4.7 4.2 / 4.7	0.5 0.5	tbd tbd
Tue	Apr-06	0.2	D D	0% 0%	19:45-00:26 00:26-05:07	4.2 / 4.7 4.2 / 4.7	0.5 0.5	tbd tbd
Wed	Apr-07	1.2	D D	1% 0%	19:46-00:26 00:26-05:06	4.2 / 4.7 4.2 / 4.7	0.5 0.5	tbd tbd
Thu	Apr-08	2.2	D D	5% 0%	19:47-00:26 00:26-05:04	3.4 / 4.7 4.1 / 4.6	0.5 0.5	tbd tbd
Fri	Apr-09	3.2	D D	12% 0%	19:48-00:26 00:26-05:03	2.2 / 4.6 4.1 / 4.6	0.5 0.5	tbd tbd
Sat	Apr-10	4.2	D D	21% 0%	19:49-00:25 00:25-05:02	1.1 / 4.6 4.1 / 4.6	0.5 0.5	tbd tbd
Sun	Apr-11	5.2	g D	31% 0%	19:50-00:25 00:25-05:00	0.0 / 4.6 4.1 / 4.6	0.5 0.5	tbd tbd
Mon	Apr-12	6.2	g D	42% 42%	19:51-00:24 00:24-04:59	0.0 / 4.5 3.2 / 4.6	0.5 0.5	tbd tbd
Tue	Apr-13	7.2	g D	53% 54%	19:52-00:25 00:25-04:57	0.0 / 4.5 2.4 / 4.5	0.5 0.5	tbd tbd
Wed	Apr-14	8.2	g g	65% 66%	19:52-00:24 00:24-04:56	0.0 / 4.5 1.7 / 4.5	0.5 0.5	tbd tbd
Thu	Apr-15	9.2	b g	75% 76%	19:53-00:24 00:24-04:54	0.0 / 4.5 1.1 / 4.5	0.5 0.5	tbd tbd
Fri	Apr-16	10.2	b g	84% 85%	19:54-00:23 00:23-04:53	0.0 / 4.5 0.6 / 4.5	0.5 0.5	tbd tbd
Sat	Apr-17	11.2	b b	92% 92%	19:55-00:24 00:24-04:52	0.0 / 4.5 0.1 / 4.5	0.5 0.5	tbd tbd
Sun	Apr-18	12.2	b b	97% 97%	19:56-00:23 00:23-04:50	0.0 / 4.5 0.0 / 4.5	0.5 0.5	tbd tbd
Mon	Apr-19	13.2	b b	99% 100%	19:57-00:23 00:23-04:49	0.0 / 4.4 0.0 / 4.4	0.5 0.5	tbd tbd
Tue	Apr-20	14.2	b b	100% 100%	19:58-00:22 00:22-04:48	0.0 / 4.4 0.0 / 4.4	0.5 0.5	tbd tbd
Wed	Apr-21	14.1	b b	98% 98%	19:59-00:23 00:23-04:46	0.0 / 4.4 0.0 / 4.4	0.5 0.5	tbd tbd
Thu	Apr-22	13.1	g b	94% 94%	20:00-00:22 00:22-04:45	0.9 / 4.4 0.0 / 4.4	0.5 0.5	tbd tbd
Fri	Apr-23	12.1	g b	88% 88%	20:01-00:23 00:23-04:43	1.9 / 4.4 0.0 / 4.3	0.5 0.5	tbd tbd
Sat	Apr-24	11.1	D b	81% 81%	20:02-00:22 00:22-04:42	2.8 / 4.3 0.0 / 4.3	0.5 0.5	tbd tbd
Sun	Apr-25	10.1	D b	73% 73%	20:03-00:22 00:22-04:41	3.6 / 4.3 0.0 / 4.3	0.5 0.5	tbd tbd
Mon	Apr-26	9.1	D g	0% 64%	20:04-00:21 00:21-04:40	3.7 / 4.3 0.5 / 4.3	0.5 0.5	tbd tbd
Tue	Apr-27	8.1	D g	0% 54%	20:05-00:22 00:22-04:38	3.7 / 4.3 1.1 / 4.3	0.5 0.5	tbd tbd
Wed	Apr-28	7.1	D g	0% 45%	20:06-00:21 00:21-04:37	3.7 / 4.2 1.6 / 4.3	0.5 0.5	tbd tbd
Thu	Apr-29	6.1	D D	0% 35%	20:07-00:21 00:21-04:36	3.7 / 4.2 2.1 / 4.2	0.5 0.5	tbd tbd
Fri	Apr-30	5.1	D D	0% 26%	20:08-00:21 00:21-04:35	3.6 / 4.2 2.5 / 4.2	0.5 0.5	tbd tbd

May 2027 - 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	May-01	4.1	D D	0% 18%	20:09-00:21 00:21-04:33	3.6 / 4.2 2.9 / 4.2	0.5 0.5	tbd tbd
Sun	May-02	3.1	D D	0% 10%	20:10-00:21 00:21-04:32	3.6 / 4.2 3.4 / 4.2	0.5 0.5	tbd tbd
Mon	May-03	2.1	D D	0% 5%	20:11-00:21 00:21-04:31	3.6 / 4.2 3.6 / 4.2	0.5 0.5	tbd tbd
Tue	May-04	1.1	D D	0% 0%	20:12-00:21 00:21-04:30	3.6 / 4.2 3.6 / 4.2	0.5 0.5	tbd tbd
Wed	May-05	0.1	D D	0% 0%	20:13-00:20 00:20-04:29	3.5 / 4.1 3.6 / 4.2	0.5 0.5	tbd tbd
Thu	May-06	0.9	D D	0% 0%	20:14-00:21 00:21-04:27	3.5 / 4.1 3.5 / 4.1	0.5 0.5	tbd tbd
Fri	May-07	1.9	D D	4% 0%	20:15-00:20 00:20-04:26	3.2 / 4.1 3.5 / 4.1	0.5 0.5	tbd tbd
Sat	May-08	2.9	D D	10% 0%	20:16-00:21 00:21-04:25	2.1 / 4.1 3.5 / 4.1	0.5 0.5	tbd tbd
Sun	May-09	3.9	D D	18% 0%	20:17-00:20 00:20-04:24	1.1 / 4.0 3.5 / 4.1	0.5 0.5	tbd tbd
Mon	May-10	4.9	g D	28% 0%	20:18-00:20 00:20-04:23	0.3 / 4.0 3.5 / 4.0	0.5 0.5	tbd tbd
Tue	May-11	5.9	g D	39% 40%	20:19-00:21 00:21-04:22	0.0 / 4.0 3.1 / 4.0	0.5 0.5	tbd tbd
Wed	May-12	6.9	g D	51% 51%	20:20-00:20 00:20-04:21	0.0 / 4.0 2.5 / 4.0	0.5 0.5	tbd tbd
Thu	May-13	7.9	g D	62% 63%	20:21-00:20 00:20-04:20	0.0 / 4.0 1.9 / 4.0	0.5 0.5	tbd tbd
Fri	May-14	8.9	b g	72% 73%	20:21-00:20 00:20-04:19	0.0 / 4.0 1.4 / 4.0	0.5 0.5	tbd tbd
Sat	May-15	9.9	b g	82% 82%	20:22-00:20 00:20-04:18	0.0 / 4.0 1.0 / 4.0	0.5 0.5	tbd tbd
Sun	May-16	10.9	b g	89% 90%	20:23-00:21 00:21-04:17	0.0 / 4.0 0.5 / 3.9	0.5 0.5	tbd tbd
Mon	May-17	11.9	b b	95% 95%	20:24-00:20 00:20-04:16	0.0 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Tue	May-18	12.9	b b	98% 99%	20:25-00:20 00:20-04:16	0.0 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Wed	May-19	13.9	b b	100% 100%	20:26-00:21 00:21-04:15	0.0 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Thu	May-20	14.6	b b	99% 99%	20:27-00:20 00:20-04:14	0.0 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Fri	May-21	13.6	b b	97% 96%	20:28-00:20 00:20-04:13	0.1 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Sat	May-22	12.6	g b	92% 92%	20:29-00:21 00:21-04:12	0.9 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Sun	May-23	11.6	g b	86% 86%	20:30-00:21 00:21-04:12	1.6 / 3.9 0.0 / 3.9	0.5 0.5	tbd tbd
Mon	May-24	10.6	D b	79% 79%	20:31-00:21 00:21-04:11	2.3 / 3.8 0.0 / 3.8	0.5 0.5	tbd tbd
Tue	May-25	9.6	D b	71% 71%	20:32-00:21 00:21-04:10	2.8 / 3.8 0.0 / 3.8	0.5 0.5	tbd tbd
Wed	May-26	8.6	D g	0% 62%	20:32-00:21 00:21-04:10	3.2 / 3.8 0.1 / 3.8	0.5 0.5	tbd tbd
Thu	May-27	7.6	D g	0% 52%	20:33-00:21 00:21-04:09	3.1 / 3.8 0.5 / 3.8	0.5 0.5	tbd tbd
Fri	May-28	6.6	D g	0% 42%	20:34-00:21 00:21-04:09	3.1 / 3.8 0.9 / 3.8	0.5 0.5	tbd tbd
Sat	May-29	5.6	D D	0% 32%	20:35-00:22 00:22-04:08	3.1 / 3.8 1.3 / 3.8	0.5 0.5	tbd tbd
Sun	May-30	4.6	D D	0% 23%	20:36-00:22 00:22-04:08	3.1 / 3.8 1.8 / 3.8	0.5 0.5	tbd tbd
Mon	May-31	3.6	D D	0% 15%	20:36-00:21 00:21-04:07	3.1 / 3.8 2.3 / 3.8	0.5 0.5	tbd tbd

June 2027 - 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	Jun-01	2.6	D D	0% 8%	20:37-00:22 00:22-04:07	3.1 / 3.8 2.8 / 3.8	0.5 0.5	tbd tbd
Wed	Jun-02	1.6	D D	0% 3%	20:38-00:22 00:22-04:06	3.1 / 3.7 3.1 / 3.7	0.5 0.5	tbd tbd
Thu	Jun-03	0.6	D D	0% 0%	20:39-00:22 00:22-04:06	3.1 / 3.7 3.1 / 3.7	0.5 0.5	tbd tbd
Fri	Jun-04	0.4	D D	0% 0%	20:39-00:22 00:22-04:05	3.0 / 3.7 3.1 / 3.7	0.5 0.5	tbd tbd
Sat	Jun-05	1.4	D D	2% 0%	20:40-00:22 00:22-04:05	3.0 / 3.7 3.1 / 3.7	0.5 0.5	tbd tbd
Sun	Jun-06	2.4	D D	8% 0%	20:41-00:23 00:23-04:05	2.5 / 3.7 3.0 / 3.7	0.5 0.5	tbd tbd
Mon	Jun-07	3.4	D D	16% 0%	20:41-00:23 00:23-04:05	1.7 / 3.7 3.0 / 3.7	0.5 0.5	tbd tbd
Tue	Jun-08	4.4	D D	25% 0%	20:42-00:24 00:24-04:04	1.1 / 3.7 3.0 / 3.7	0.5 0.5	tbd tbd
Wed	Jun-09	5.4	g D	36% 0%	20:42-00:24 00:24-04:04	0.6 / 3.7 3.0 / 3.7	0.5 0.5	tbd tbd
Thu	Jun-10	6.4	g D	48% 0%	20:43-00:23 00:23-04:04	0.1 / 3.7 3.0 / 3.7	0.5 0.5	tbd tbd
Fri	Jun-11	7.4	g D	59% 59%	20:44-00:23 00:23-04:04	0.0 / 3.6 2.6 / 3.7	0.5 0.5	tbd tbd
Sat	Jun-12	8.4	g D	69% 70%	20:44-00:24 00:24-04:04	0.0 / 3.7 2.1 / 3.7	0.5 0.5	tbd tbd
Sun	Jun-13	9.4	b g	79% 79%	20:45-00:24 00:24-04:04	0.0 / 3.6 1.6 / 3.7	0.5 0.5	tbd tbd
Mon	Jun-14	10.4	b g	86% 87%	20:45-00:24 00:24-04:04	0.0 / 3.6 1.1 / 3.7	0.5 0.5	tbd tbd
Tue	Jun-15	11.4	b g	93% 93%	20:45-00:25 00:25-04:04	0.0 / 3.7 0.5 / 3.6	0.5 0.5	tbd tbd
Wed	Jun-16	12.4	b b	97% 97%	20:46-00:25 00:25-04:04	0.0 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Thu	Jun-17	13.4	b b	99% 99%	20:46-00:25 00:25-04:04	0.0 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Fri	Jun-18	14.4	b b	100% 100%	20:46-00:26 00:26-04:04	0.0 / 3.7 0.0 / 3.6	0.5 0.5	tbd tbd
Sat	Jun-19	13.9	b b	99% 98%	20:47-00:26 00:26-04:04	0.0 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Sun	Jun-20	12.9	b b	96% 95%	20:47-00:26 00:26-04:04	0.0 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Mon	Jun-21	11.9	g b	91% 90%	20:47-00:26 00:26-04:05	0.5 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Tue	Jun-22	10.9	g b	85% 84%	20:47-00:27 00:27-04:05	1.0 / 3.7 0.0 / 3.6	0.5 0.5	tbd tbd
Wed	Jun-23	9.9	g b	77% 76%	20:48-00:27 00:27-04:05	1.4 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Thu	Jun-24	8.9	D g	68% 68%	20:48-00:27 00:27-04:06	1.8 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Fri	Jun-25	7.9	D g	59% 58%	20:48-00:27 00:27-04:06	2.2 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Sat	Jun-26	6.9	D g	49% 49%	20:48-00:27 00:27-04:06	2.7 / 3.6 0.0 / 3.6	0.5 0.5	tbd tbd
Sun	Jun-27	5.9	D g	0% 38%	20:48-00:27 00:27-04:07	3.0 / 3.6 0.1 / 3.7	0.5 0.5	tbd tbd
Mon	Jun-28	4.9	D D	0% 28%	20:48-00:27 00:27-04:07	3.0 / 3.6 0.7 / 3.7	0.5 0.5	tbd tbd
Tue	Jun-29	3.9	D D	0% 19%	20:48-00:27 00:27-04:08	3.0 / 3.6 1.3 / 3.7	0.5 0.5	tbd tbd
Wed	Jun-30	2.9	D D	0% 10%	20:48-00:27 00:27-04:08	3.0 / 3.6 2.0 / 3.7	0.5 0.5	tbd tbd

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, T=UToledo, W=Weizmann, 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.

2027A Approved Target of Opportunity (ToO) Programs
Program ID	Principal	ToO Type	Time Allocated (hours)	Time Remaining (hours)	Requested Instrument & Filters/Grating
Totals			0.00	0.00

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@
    Kyler Kuehn (DirTech) KK; kkuehn@
    Stephen Levine (Ast/TelSci) SL; sel@
    Beck Maier (TelOp) BM; emaier@
    Ishara Nisley (TelOp) IN; inisley@
    Observer (Observer) OBS;
    Safety Tech (Safety Tech) ST;
    Ben Shafransky (TelOp) BS; bshafransky@
    Cecilia Siqueiros (TelOp) CS; csiqueiros@
    Kathryn Turrentine (Safety) KT; kturrentine@
    Visitor (Visitor) VST;
    Olivia Weiss (TelOp) OW; oweiss@

Summary of dates on which approved programs are scheduled (note some dates are partial nights):
tbd                    2027-01-01, 2027-01-02, 2027-01-03, 2027-01-04, 2027-01-05, 2027-01-06
                       2027-01-07, 2027-01-08, 2027-01-09, 2027-01-10, 2027-01-11, 2027-01-12
                       2027-01-13, 2027-01-14, 2027-01-15, 2027-01-16, 2027-01-17, 2027-01-18
                       2027-01-19, 2027-01-20, 2027-01-21, 2027-01-22, 2027-01-23, 2027-01-24
                       2027-01-25, 2027-01-26, 2027-01-27, 2027-01-28, 2027-01-29, 2027-01-30
                       2027-01-31, 2027-02-01, 2027-02-02, 2027-02-03, 2027-02-04, 2027-02-05
                       2027-02-06, 2027-02-07, 2027-02-08, 2027-02-09, 2027-02-10, 2027-02-11
                       2027-02-12, 2027-02-13, 2027-02-14, 2027-02-15, 2027-02-16, 2027-02-17
                       2027-02-18, 2027-02-19, 2027-02-20, 2027-02-21, 2027-02-22, 2027-02-23
                       2027-02-24, 2027-02-25, 2027-02-26, 2027-02-27, 2027-02-28, 2027-03-01
                       2027-03-02, 2027-03-03, 2027-03-04, 2027-03-05, 2027-03-06, 2027-03-07
                       2027-03-08, 2027-03-09, 2027-03-10, 2027-03-11, 2027-03-12, 2027-03-13
                       2027-03-14, 2027-03-15, 2027-03-16, 2027-03-17, 2027-03-18, 2027-03-19
                       2027-03-20, 2027-03-21, 2027-03-22, 2027-03-23, 2027-03-24, 2027-03-25
                       2027-03-26, 2027-03-27, 2027-03-28, 2027-03-29, 2027-03-30, 2027-03-31
                       2027-04-01, 2027-04-02, 2027-04-03, 2027-04-04, 2027-04-05, 2027-04-06
                       2027-04-07, 2027-04-08, 2027-04-09, 2027-04-10, 2027-04-11, 2027-04-12
                       2027-04-13, 2027-04-14, 2027-04-15, 2027-04-16, 2027-04-17, 2027-04-18
                       2027-04-19, 2027-04-20, 2027-04-21, 2027-04-22, 2027-04-23, 2027-04-24
                       2027-04-25, 2027-04-26, 2027-04-27, 2027-04-28, 2027-04-29, 2027-04-30
                       2027-05-01, 2027-05-02, 2027-05-03, 2027-05-04, 2027-05-05, 2027-05-06
                       2027-05-07, 2027-05-08, 2027-05-09, 2027-05-10, 2027-05-11, 2027-05-12
                       2027-05-13, 2027-05-14, 2027-05-15, 2027-05-16, 2027-05-17, 2027-05-18
                       2027-05-19, 2027-05-20, 2027-05-21, 2027-05-22, 2027-05-23, 2027-05-24
                       2027-05-25, 2027-05-26, 2027-05-27, 2027-05-28, 2027-05-29, 2027-05-30
                       2027-05-31, 2027-06-01, 2027-06-02, 2027-06-03, 2027-06-04, 2027-06-05
                       2027-06-06, 2027-06-07, 2027-06-08, 2027-06-09, 2027-06-10, 2027-06-11
                       2027-06-12, 2027-06-13, 2027-06-14, 2027-06-15, 2027-06-16, 2027-06-17
                       2027-06-18, 2027-06-19, 2027-06-20, 2027-06-21, 2027-06-22, 2027-06-23
                       2027-06-24, 2027-06-25, 2027-06-26, 2027-06-27, 2027-06-28, 2027-06-29
                       2027-06-30


ID  PI Name            Title
tbd

Latest as of 2026-10-16T05:07:21.944272+00:00 UTC