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Kitt Peak Nightly LTO Report For UT: 2025-12-07

Report Time (MST): 06:43                    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)	8.1	10.5	7.0	0.4
Dewpoint Temperature (°C)	-4.2	-1.7	-7.2	1.2
Relative humidity (%)	42	53	33	4.6
Wind Speed (mph)	15.2	24.3	8.4	2.7
Wind Direction (°)	292	2	70	0.6
4M Dome Temperature (°C)	8.1	9.9	7.1	0.4
4M Dome Dewpoint (°C)	-3.2	-1.2	-5.3	1.0
4M Primary Mirror (°C)	8.2	8.4	7.5	0.1

Weather Comments:	Clear skies all night. Humidity started around 20% then steadily rose to 50%. Winds below 10mph after sunset increased to 20mph after midnight.
Recognized Hours:	( 11.5 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	LOs (on site): Kahn (1st quarter), Elliott (rest of the night); SO (on site): Bouchard	---	DESI	N/A	1.0
WIYN	Fernandez	2025B-300001	NEID	N/A	0.8
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
	11.45	Scientific Research		0.05	Misc. Problems	20:30 - 21:00
WIYN
	11.5	Scientific Research		0	Weather
2Meter
	11.5	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	11.5	Shutdown		0	Weather

Observing Status

4 Meter	DESI Survey Observing. Only lost 3 mins to the VC caravan. No other time lost. Seeing Range: 0.8-1.6 arcsec, Median: 1.0 arcsec.
WIYN	NEID Q Observing. No time lost. Seeing Range: 0.65-1.4 arcsec, MedianL 0.8 arcsec.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	A moon bright night.

Reported by:	Amy Robertson

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