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Kitt Peak Nightly LTO Report For UT: 2019-02-18

Report Time (MST): 05:10                    For access to all LTO-Reports go to: http://www-kpno.kpno.noao.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)	-2.8	-1.2	-3.5	0.4
Dewpoint Temperature (°C)	-8.0	-5.6	-11.6	1.4
Relative humidity (%)	67	84	48	7.4
Wind Speed (mph)	36.8	51.3	13.4	4.2
Wind Direction (°)	202	315	197	0.7
4M Dome Temperature (°C)	0.0	0.0	0.0
4M Dome Dewpoint (°C)	0.0	0.0	0.0
4M Primary Mirror (°C)	0.0	0.0	0.0

Weather Comments:	Mostly clear until around 4am when thin clouds below the level of the mountain formed and began streaming up over the mountain. Humidity fluctuated between 60 and 100 percent. Twenty to thirty mph wind out of the SE
Recognized Hours:	( 10.5 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	No Observer	---	N/A	N/A	N/A
WIYN	Colon - remote -	2019A-0233	WHIRC	N/A	1.2
2.1 Meter	No Observer	---	N/A	N/A	N/A
Feed	No Observer	---	N/A	N/A	N/A
0.9 Meter	Lee	2019A-0918	HDI	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
	10.5	Shutdown
WIYN
	5.25	Scientific Research		5.25	Weather	21:00 - 06:00
2Meter
	0.0	Scientific Research
Feed
	0.0	Scientific Research
W0_9m
				3.25	Weather	21:00 - 06:00
				7.25	Instrument Problem	18:00 - 06:00

Observing Status

4 Meter	Mayall shutdown in preparation for DESI.
WIYN	Seeing ranged from 1 to 1.5. No problems other than humidity.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Lost the entire night due to a problem with noise on the ccd

Comments	A wild night on the humidity roller coaster.

Reported by:	Karen Butler

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