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Kitt Peak Nightly LTO Report For UT: 2026-07-26

Report Time (MST): 03:35                    For access to all LTO-Reports go to: http://www-kpno.kpno.noirlab.edu/cgi-bin/ltoreport

4 Meter Weather Averages
From: UT = 01:00 (MST=6:00 PM) To: UT = 13:00 (MST=6:00 AM)

Elements	Mean	High	Low	AvDev
Air Temperature (°C)	22.9	24.6	20.1	0.9
Dewpoint Temperature (°C)	11.6	14.2	10.4	0.6
Relative humidity (%)	49	69	43	3.6
Wind Speed (mph)	17.5	34.7	1.8	5.7
Wind Direction (°)	300	48	32	1.2
4M Dome Temperature (°C)	24.2	26.5	23.1	1.0
4M Dome Dewpoint (°C)	12.2	13.6	11.5	0.5
4M Primary Mirror (°C)	21.9	22.1	21.3	0.1

Weather Comments:	Threatening clouds throughout the night. Wind ranged from 2.5mph-34.7mph, with a median in the high teens. Wind direction was primarily NW. Relative humidity ranged from 43%-69%, with a median around 50%.
Recognized Hours:	( 7.5 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	LO: Tyas; SOs: Yu (1st half, remote), Mukherjee (2nd half, remote)	---	DESI	N/A	N/A
WIYN	Higuera	2026A-300001	NEID	N/A	N/A
2.1 Meter	No Observer	---	---	N/A	N/A
Feed	No Observer	---	N/A	N/A	N/A
0.9 Meter	No Observer	---	---	N/A	N/A

Time Usage During The Night

Telescope	Hours Used	Night's Activity		Hours Lost	Time Lost Due To:	Time of Night (MST)
4Meter
	0	Scientific Research		7.5	Weather	20:30 - 04:30
WIYN
	0	Scientific Research		7.5	Weather	20:30 - 04:30
2Meter
	7.5	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	7.5	Shutdown		0	Weather

Observing Status

4 Meter	DESI Survey Observing. Entire night lost to weather.
WIYN	NEID Queue Observing. Entire night lost to weather.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	Threatening clouds throughout the night, no observing.

Reported by:	Ava Doty

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