HET Night Report Reader

Civil Date	Ephemerides
2026-04-20	Sunset			Sunrise			Moon
	Set	12°	18°	18°	12°	Rise	Rise	Set
	01:34	02:21	02:52	10:56	11:27	12:15	-	05:35
Night Length	8:04		Sunset Temperature

On-Duty Personnel
Resident Astronomer	Telescope Operator
Sergey Rostopchin	Justen Pautzke

Overlaps
TO Overlap	RA Overlap
Amy Westfall	-

Other Personnel	none

Guests	none

Open/Close Log
Open time	Outdoor temp	Truss temp	Close time	Reason	Time open
01:31	13.0	12.9	02:37	clouds	01:06
03:17	11.6	12.9	06:02	dew point	02:45
06:51	11.5	12.8	11:38	twilight	04:47
Total Time Open					8:38

Program	Night Priority	Science
02:52	Idle due to weather (high humidity, clouds)
03:12	Science
05:16	Idle due to weather (high humidity)
06:46	Science

Stack Data
Start	Stop	ee50	ee80	Hefi Focus	Mars Focus	Outside Temp	Dome Temp	Truss Temp	Wind Direction	Wind Speed	Stack Type
02:00	02:35	0.56	0.99	85	-3810	12.5	13.1	13.0	197	11	First of Night
↪ Comments			exposure time during measurement manually set to 1/125s
11:30	11:36	0.94	1.54	170	-3434	13.2	12.1	12.2	186	10	Post-Observing

Problem Reports					no PRs

TO Comments	Storms and moderate humidity early in the night, then clear and calm with slowly decreasing humidity. No issues.

RA Comments	none

Observations
File	Target/QID	Exp Start	Exposure	Overhead	Program	Instrument Configuration	Data Type	IQ	Dimm	SkySBrt	Skytrans	SNR	Comments	Charge
lrs20000019_02	dark	00:00	360			LRS2	cal							Yes
virus0000015_02	dark	00:00	360			VIRUS	cal							Yes
lrs20000019_03	dark	00:07	360			LRS2	cal							Yes
virus0000015_03	dark	00:07	360			VIRUS	cal							Yes
0001	twilight	01:34	298.2			HPF	cal					494		Yes
lrs20000001_01	skyflat	01:40	7			LRS2	cal							Yes
lrs20000002_01	skyflat	01:41	10			LRS2	cal							Yes
lrs20000003_01	skyflat	01:42	13			LRS2	cal							Yes
lrs20000004_01	skyflat	01:43	16			LRS2	cal							Yes
lrs20000005_01	skyflat	01:44	22			LRS2	cal							Yes
lrs20000006_01	skyflat	01:46	30			LRS2	cal							Yes
virus0000001_01	skyflat	01:48	7			VIRUS	cal							Yes
virus0000002_01	skyflat	01:50	10			VIRUS	cal							Yes
virus0000003_01	skyflat	01:51	14			VIRUS	cal							Yes
virus0000004_01	skyflat	01:52	18			VIRUS	cal							Yes
virus0000005_01	skyflat	01:54	26			VIRUS	cal							Yes
0002	LFC Cal	02:01	106.5			HPF	cal							Yes
0003	LFC Cal	02:03	106.5			HPF	cal							Yes
0004	LFC Cal	02:06	106.5			HPF	cal							Yes
virus0000006_01	parallel	03:19	1435			VIRUS	sci							Yes
lrs20000007_01	QID 16	03:19	1435	7.1	PSU26-2-005	LRS2-R	sci	1.57		20.80	0.95			Yes
0005	LFC Cal	03:20	106.5			HPF	cal							Yes
0006	LFC Cal	03:22	106.5			HPF	cal							Yes
0007	LFC Cal	03:24	106.5			HPF	cal							Yes
virus0000007_01	parallel	03:51	300			VIRUS	sci							Yes
0008	LFC Cal	03:52	106.5			HPF	cal							Yes
lrs20000008_01	QID 598	03:52	300	9.0	PSU26-2-001	LRS2-R	sci	1.39		20.61	1.13			P4
0009	LFC Cal	03:54	106.5			HPF	cal							Yes
0010	QID 677	04:08	969.1	10.8	UT26-2-007	HPF	sci	1.55		20.22	0.92	24		Yes
virus0000008_01	parallel	04:08	2047			VIRUS	sci							Yes
0011	QID 677	04:25	969.1	0.8	UT26-2-007	HPF	sci	1.51		20.29	0.94	28		Yes
virus0000009_01	parallel	04:48	300			VIRUS	sci							Yes
0012	LFC Cal	04:49	106.5			HPF	cal							Yes
lrs20000009_01	QID 604	04:49	300	8.0	PSU26-2-001	LRS2-R	sci	1.64		20.80	0.97			P4
0013	LFC Cal	04:51	106.5			HPF	cal							Yes
virus0000010_01	parallel	04:59	300			VIRUS	sci							Yes
0014	LFC Cal	05:00	106.5			HPF	cal							Yes
lrs20000010_01	QID 617	05:00	300	6.0	PSU26-2-001	LRS2-R	sci	1.63		20.97	0.86			P4
0015	LFC Cal	05:02	106.5			HPF	cal							Yes
0016	LFC Cal	05:11	106.5			HPF	cal							Yes
lrs20000011_01	QID 605	05:11	300	6.0	PSU26-2-001	LRS2-R	sci	1.66		20.87	0.82			P4
virus0000011_01	parallel	05:11	300			VIRUS	sci							Yes
0017	LFC Cal	05:14	106.5			HPF	cal							Yes
0018	LFC Cal	05:23	106.5			HPF	cal							Yes
lrs20000012_01	QID 828	05:23	3000	7.0	PSU26-2-011	LRS2-B	sci	1.46	4.20	21.87	0.83		Telescope closed due to high humidity	No
virus0000012_01	parallel	05:23	3000			VIRUS	sci							Yes
0019	LFC Cal	05:25	106.5			HPF	cal							Yes
0020	LFC Cal	05:28	106.5			HPF	cal							Yes
0021	LFC Cal	06:23	106.5			HPF	cal							Yes
0022	LFC Cal	06:25	106.5			HPF	cal							Yes
0023	LFC Cal	06:27	106.5			HPF	cal							Yes
lrs20000013_01	parallel	06:51	360			LRS2	sci							Yes
virus0000013_01	QID 556	06:51	360	5.0	UT26-2-016	VIRUS	sci	1.92		22.01	0.83			Yes
0024	LFC Cal	06:52	106.5			HPF	cal							Yes
0025	LFC Cal	06:54	106.5			HPF	cal							Yes
lrs20000013_02	parallel	06:58	360			LRS2	sci							Yes
virus0000013_02	QID 556	06:58	360	1.0	UT26-2-016	VIRUS	sci	1.71		22.01	0.84			Yes
lrs20000013_03	parallel	07:06	360			LRS2	sci							Yes
virus0000013_03	QID 556	07:06	360	2.0	UT26-2-016	VIRUS	sci	1.69	1.30	22.04	0.84			Yes
0026	LFC Cal	07:17	106.5			HPF	cal							Yes
virus0000014_01	parallel	07:17	2400			VIRUS	sci							Yes
lrs20000014_01	QID 824	07:17	2400	5.0	PSU26-2-011	LRS2-B	sci	1.59	1.18	22.18	0.86			Yes
0027	LFC Cal	07:20	106.5			HPF	cal							Yes
0028	LFC Cal	07:22	106.5			HPF	cal							Yes
0029	QID 173	08:04	170.4	7.2	UT26-2-011	HPF	sci	1.46	1.05	20.18	0.79	231		Yes
0030	LFC Cal	08:14	106.5			HPF	cal							Yes
virus0000015_01	parallel	08:14	1800			VIRUS	sci							Yes
lrs20000015_01	QID 830	08:14	1800	7.0	PSU26-2-011	LRS2-B	sci	1.59	1.35	22.16	0.90			Yes
0031	LFC Cal	08:16	106.5			HPF	cal							Yes
0032	LFC Cal	08:19	106.5			HPF	cal							Yes
0033	LFC Cal	08:53	106.5			HPF	cal							Yes
virus0000016_01	parallel	08:53	2400			VIRUS	sci							Yes
lrs20000016_01	QID 834	08:53	2400	9.0	PSU26-2-011	LRS2-B	sci	1.62	1.08	22.16	0.89			Yes
0034	LFC Cal	08:55	106.5			HPF	cal							Yes
0035	LFC Cal	08:58	106.5			HPF	cal							Yes
lrs20000017_01	1812095_056_E	09:39	120	6.0		LRS2	spec	1.88	1.23	22.11	0.81			Yes
lrs20000018_01	1812095_066_E	09:43	120	2.0		LRS2	spec	1.73	1.02	20.88	0.89			Yes
0036	LFC Cal	09:50	106.5			HPF	cal							Yes
virus0000017_01	parallel	09:50	1800			VIRUS	sci							Yes
lrs20000019_01	QID 459	09:50	1800	5.0	UT26-2-018	LRS2-B	sci	1.51	1.18	22.09	0.82			Yes
0037	LFC Cal	09:52	106.5			HPF	cal							Yes
0038	LFC Cal	09:55	106.5			HPF	cal							Yes
virus0000018_01	parallel	10:23	900			VIRUS	sci							Yes
0039	LFC Cal	10:24	106.5			HPF	cal							Yes
lrs20000020_01	QID 460	10:24	900	4.0	UT26-2-018	LRS2-R	sci	1.64	1.27	20.91	1.05			Yes
0040	LFC Cal	10:26	106.5			HPF	cal							Yes
0041	LFC Cal	10:28	106.5			HPF	cal							Yes
virus0000019_01	parallel	10:43	2047			VIRUS	sci							Yes
0042	QID 803	10:44	969.1	4.8	PSU26-2-015	HPF	sci	1.72	1.22	20.10	0.88	144		Yes
0043	QID 803	11:01	969.1	0.8	PSU26-2-015	HPF	sci	1.87	1.82	20.04	0.87	144		Yes
0044	LFC Cal	11:19	106.5			HPF	cal							Yes
0045	HR6036_tell_std	11:23	330.2	6.5		HPF	telluric	2.09	1.91	19.08	0.92			Yes
lrs20000021_01	bias	11:30	0			LRS2	cal							Yes
virus0000020_01	bias	11:31	0			VIRUS	cal							Yes
virus0000021_01	Cd-A	11:34	15		ENG26-2-002	VIRUS	cal							Yes
virus0000022_01	Hg	11:35	15		ENG26-2-002	VIRUS	cal							Yes
0046	Dark	11:45	319.5			HPF	cal							Yes
0047	Quartz FCU	11:57	74.5			HPF	cal							Yes
0048	Quartz FCU	11:58	74.5			HPF	cal							Yes
0049	Quartz FCU	12:00	74.5			HPF	cal							Yes
0050	Quartz FCU	12:02	74.5			HPF	cal							Yes
0051	Quartz FCU	12:04	74.5			HPF	cal							Yes
0052	Quartz FCU	12:05	74.5			HPF	cal							Yes
0053	Quartz FCU	12:07	74.5			HPF	cal							Yes
0054	Alpha Bright Cal	12:09	85.2			HPF	cal							Yes
0055	Alpha Bright Cal	12:11	85.2			HPF	cal							Yes
0056	Alpha Bright Cal	12:13	85.2			HPF	cal							Yes
0057	Alpha Bright Cal	12:15	85.2			HPF	cal							Yes
0058	LFC FCU	12:18	106.5			HPF	cal							Yes
0059	LFC FCU	12:20	106.5			HPF	cal							Yes
0060	LFC FCU	12:23	106.5			HPF	cal							Yes
0061	LFC FCU	12:25	106.5			HPF	cal							Yes
0062	LFC FCU	12:27	106.5			HPF	cal							Yes
0063	LFC FCU	12:30	106.5			HPF	cal							Yes
0064	LFC Cal	12:33	106.5			HPF	cal							Yes
0065	LFC Cal	12:35	106.5			HPF	cal							Yes
0066	Etalon Cal	12:43	159.8			HPF	cal							Yes
0067	Etalon Cal	12:46	159.8			HPF	cal							Yes
0068	Etalon Cal	12:49	159.8			HPF	cal							Yes
0069	Etalon Cal	12:52	159.8			HPF	cal							Yes
0070	UNe Slave Cal	12:56	426			HPF	cal							Yes
0071	UNe Slave Cal	13:03	426			HPF	cal							Yes
0072	UNe Slave Cal	13:11	426			HPF	cal							Yes
0073	UNe Slave Cal	13:19	426			HPF	cal							Yes
0074	UNe Slave Cal	13:27	426			HPF	cal							Yes
0075	UNe Slave Cal	13:35	426			HPF	cal							Yes
0062	LFC Cal	21:55	106.5			HPF	cal							Yes
lrs20009900_01	bias	22:06	0			LRS2	cal							Yes
virus0009900_01	flat_Qth	22:07	20			VIRUS	cal							Yes
virus0009901_01	bias	22:08	0			VIRUS	cal							Yes
lrs20009901_01	flat_ldls_long_B	22:09	20			LRS2	cal							Yes
virus0009902_01	dark	22:10	15			VIRUS	cal							Yes
lrs20009902_01	Cd-A_B	22:11	29			LRS2	cal							Yes
lrs20009903_01	FeAr_R	22:13	15			LRS2	cal							Yes
lrs20009904_01	Hg_B	22:14	15			LRS2	cal							Yes
0063	Dark	22:17	319.5			HPF	cal							Yes
0064	Quartz FCU	22:23	74.5			HPF	cal							Yes
0065	Quartz FCU	22:25	74.5			HPF	cal							Yes
0066	Quartz FCU	22:27	74.5			HPF	cal							Yes
0067	Quartz FCU	22:29	74.5			HPF	cal							Yes
0068	Quartz FCU	22:31	74.5			HPF	cal							Yes
0069	Quartz FCU	22:32	74.5			HPF	cal							Yes
0070	Quartz FCU	22:34	74.5			HPF	cal							Yes
0071	Alpha Bright Cal	22:36	85.2			HPF	cal							Yes
0072	Alpha Bright Cal	22:38	85.2			HPF	cal							Yes
0073	Alpha Bright Cal	22:40	85.2			HPF	cal							Yes
0074	Alpha Bright Cal	22:42	85.2			HPF	cal							Yes
0075	LFC FCU	22:45	106.5			HPF	cal							Yes
0076	LFC FCU	22:47	106.5			HPF	cal							Yes
0077	LFC Cal	22:50	106.5			HPF	cal							Yes
0078	LFC Cal	22:52	106.5			HPF	cal							Yes
0079	Etalon Cal	22:55	159.8			HPF	cal							Yes
0080	UNe Slave Cal	22:59	426			HPF	cal							Yes
lrs20000012_01	flat_Qth_R	22:59	15			LRS2	cal							Yes
lrs20000012_02	flat_Qth_R	23:01	15			LRS2	cal							Yes
lrs20000012_03	flat_Qth_R	23:02	15			LRS2	cal							Yes
lrs20000012_04	flat_Qth_R	23:03	15			LRS2	cal							Yes
lrs20000012_05	flat_Qth_R	23:04	15			LRS2	cal							Yes
lrs20000013_01	flat_ldls_long_B	23:06	20			LRS2	cal							Yes
0081	UNe Slave Cal	23:07	426			HPF	cal							Yes
lrs20000013_02	flat_ldls_long_B	23:07	20			LRS2	cal							Yes
lrs20000013_03	flat_ldls_long_B	23:08	20			LRS2	cal							Yes
lrs20000014_01	Cd-A_B	23:10	29			LRS2	cal							Yes
lrs20000014_02	Cd-A_B	23:11	29			LRS2	cal							Yes
lrs20000014_03	Cd-A_B	23:12	29			LRS2	cal							Yes
0082	UNe Slave Cal	23:14	426			HPF	cal							Yes
lrs20000015_01	FeAr_R	23:14	15			LRS2	cal							Yes
lrs20000015_02	FeAr_R	23:15	15			LRS2	cal							Yes
lrs20000015_03	FeAr_R	23:16	15			LRS2	cal							Yes
lrs20000016_01	Hg_R	23:18	20			LRS2	cal							Yes
lrs20000016_02	Hg_R	23:19	20			LRS2	cal							Yes
lrs20000016_03	Hg_R	23:20	20			LRS2	cal							Yes
lrs20000017_01	Hg_B	23:22	15			LRS2	cal							Yes
0083	UNe Slave Cal	23:22	426			HPF	cal							Yes
lrs20000017_02	Hg_B	23:23	15			LRS2	cal							Yes
lrs20000017_03	Hg_B	23:24	15			LRS2	cal							Yes
0084	UNe Slave Cal	23:30	426			HPF	cal							Yes
virus0000011_01	flat_ldls_long	23:31	15			VIRUS	cal							Yes
virus0000011_02	flat_ldls_long	23:32	15			VIRUS	cal							Yes
virus0000011_03	flat_ldls_long	23:33	15			VIRUS	cal							Yes
virus0000012_01	Cd-A	23:35	15			VIRUS	cal							Yes
virus0000012_02	Cd-A	23:36	15			VIRUS	cal							Yes
0085	UNe Slave Cal	23:38	426			HPF	cal							Yes
virus0000012_03	Cd-A	23:38	15			VIRUS	cal							Yes
virus0000013_01	Hg	23:39	15			VIRUS	cal							Yes
virus0000013_02	Hg	23:41	15			VIRUS	cal							Yes
virus0000013_03	Hg	23:42	15			VIRUS	cal							Yes
lrs20000018_01	bias	23:43	0			LRS2	cal							Yes
virus0000014_01	bias	23:43	0			VIRUS	cal							Yes
lrs20000018_02	bias	23:44	0			LRS2	cal							Yes
virus0000014_02	bias	23:44	0			VIRUS	cal							Yes
lrs20000018_03	bias	23:45	0			LRS2	cal							Yes
virus0000014_03	bias	23:45	0			VIRUS	cal							Yes
lrs20000018_04	bias	23:46	0			LRS2	cal							Yes
virus0000014_04	bias	23:46	0			VIRUS	cal							Yes
lrs20000018_05	bias	23:47	0			LRS2	cal							Yes
virus0000014_05	bias	23:47	0			VIRUS	cal							Yes
lrs20000018_06	bias	23:48	0			LRS2	cal							Yes
lrs20000018_07	bias	23:48	0			LRS2	cal							Yes
virus0000014_06	bias	23:48	0			VIRUS	cal							Yes
virus0000014_07	bias	23:49	0			VIRUS	cal							Yes
lrs20000018_08	bias	23:49	0			LRS2	cal							Yes
virus0000014_08	bias	23:50	0			VIRUS	cal							Yes
lrs20000018_09	bias	23:50	0			LRS2	cal							Yes
virus0000014_09	bias	23:50	0			VIRUS	cal							Yes
lrs20000018_10	bias	23:51	0			LRS2	cal							Yes
virus0000014_10	bias	23:51	0			VIRUS	cal							Yes
lrs20000018_11	bias	23:52	0			LRS2	cal							Yes
virus0000014_11	bias	23:52	0			VIRUS	cal							Yes
lrs20000019_01	dark	23:53	360			LRS2	cal							Yes
virus0000015_01	dark	23:53	360			VIRUS	cal							Yes