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Kitt Peak Nightly LTO Report For UT: 2026-08-09

Report Time (MST): 05:00                    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)	23.3	25.1	20.2	1.1
Dewpoint Temperature (°C)	9.2	13.7	4.6	1.4
Relative humidity (%)	41	64	28	6.6
Wind Speed (mph)	12.8	23.4	1.6	4.2
Wind Direction (°)	139	91	97	1.0
4M Dome Temperature (°C)	23.3	26.6	20.8	1.3
4M Dome Dewpoint (°C)	10.9	13.6	8.1	1.0
4M Primary Mirror (°C)	21.6	22.5	18.6	0.8

Weather Comments:	Clear with scattered clouds on surrounding horizon. Wind ranged from 1.6mph to 23.4mph with a median of 13.8mph out of the S, SE and ENE. Humidity ranged from 28% to 64% with a median of 40%.
Recognized Hours:	( 8 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	LO: Poppett; SOs: Xia (1st half - remote), Saulder (2nd half - remote)	---	DESI	N/A	1.3
WIYN	No Observer	2026B-300000	N/A	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
	8	Scientific Research		0	Weather	20:30 - 05:00
WIYN
	8	Maintenance		0	Weather
2Meter
	8	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	8	Shutdown		0	Weather

Observing Status

4 Meter	DESI Survey Observing. Seeing ranged from 1.1" to 3.4" with a median of 1.3" as measured by DESI.
WIYN	WIYN is shutdown for summer maintenance.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	Mostly clear with surrounding clouds and erratic humidity, temperature changes and seeing. Good observing overall.

Reported by:	Vince Tucker

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