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Kitt Peak Nightly LTO Report For UT: 2026-09-20

Report Time (MST): 04:59                    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)	18.9	20.8	17.8	0.4
Dewpoint Temperature (°C)	3.7	8.8	-4.0	2.8
Relative humidity (%)	37	52	21	7.2
Wind Speed (mph)	16.0	21.6	7.1	2.1
Wind Direction (°)	199	306	241	0.2
4M Dome Temperature (°C)	20.3	22.8	18.8	1.0
4M Dome Dewpoint (°C)	5.9	8.2	1.4	1.1
4M Primary Mirror (°C)	19.0	19.1	18.9	0.0

Weather Comments:	Mostly clear all night with just a few scattered clouds. Wind generally from the southwest 5 to 20mph. Humidity between 20 and 55%
Recognized Hours:	( 9.5 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	No Observer	---	---	N/A	N/A
WIYN	Higuera	2026B-300001	NEID	N/A	1.3
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
	9.5	Shutdown		0	Weather
WIYN
	7.22	Scientific Research		2.28	Tele-Mechanical Problem	02:00 - 05:30
2Meter
	9.5	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	9.5	Shutdown		0	Weather

Observing Status

4 Meter	Shutdown for summer maintenance.
WIYN	NEID Queue Observing. Lost a little over 2 hours to ongoing collimation/optics issues that limited which targets could be observed. Seeing ranged from 1.19 to 1.45 arcsec as measured with NEID. Median seeing of 1.3 arcsec.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	A nice night.

Reported by:	Dave Summers

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