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Kitt Peak Nightly LTO Report For UT: 2026-01-22

Report Time (MST): 04:30                    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)	9.7	10.8	8.9	0.3
Dewpoint Temperature (°C)	-18.5	-11.1	-23.4	3.3
Relative humidity (%)	12	23	7	3.6
Wind Speed (mph)	16.2	24.7	3.9	3.2
Wind Direction (°)	165	344	329	0.9
4M Dome Temperature (°C)	10.9	12.3	10.2	0.5
4M Dome Dewpoint (°C)	-14.1	-10.6	-16.5	1.8
4M Primary Mirror (°C)	8.2	9.3	7.5	0.4

Weather Comments:	Nearly completely overcast skies all night. 20% humidity until 2200 when it fell to 10%. 20mph winds out of the south until 2200 when it jumped to 30mph. After 0100 the winds began to fall back to 10mph.
Recognized Hours:	( 11.25 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	LO: Landriau (on site); SOs: Gassert (1st half, remote); Fawcett (2nd half, remote)	---	DESI	N/A	N/A
WIYN	Fernandez	2025B-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		11.25	Weather	19:00 - 06:30
WIYN
	0	Scientific Research		11.25	Weather	19:00 - 06:30
2Meter
	11.25	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	11.25	Shutdown		0	Weather

Observing Status

4 Meter	DESI Survey Observing. Lost entire night to clouds.
WIYN	NEID Queue. Lost entire night to clouds.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	No science done tonight.

Reported by:	Anthony Paat

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