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LTO Report

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

Report Time (MST): 05:10                    For access to all LTO-Reports go to:

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)-2.8-1.2-3.50.4
Dewpoint Temperature (°C)-8.0-5.6-11.61.4
Relative humidity (%)6784487.4
Wind Speed (mph)36.851.313.44.2
Wind Direction (°)2023151970.7
4M Dome Temperature (°C)
4M Dome Dewpoint (°C)
4M Primary Mirror (°C)

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 MeterNo Observer --- N/A N/A N/A
WIYNColon - remote - 2019A-0233 WHIRC N/A 1.2
2.1 MeterNo Observer --- N/A N/A N/A
FeedNo Observer --- N/A N/A N/A
0.9 MeterLee 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)
10.5 Shutdown      
5.25 Scientific Research 5.25 Weather 21:00 - 06:00
0.0 Scientific Research      
0.0 Scientific Research      
      3.25 Weather 21:00 - 06:00
      7.25 Instrument Problem 18:00 - 06:00

Observing Status
4 MeterMayall shutdown in preparation for DESI.
WIYNSeeing ranged from 1 to 1.5. No problems other than humidity.
2.1 MeterNot Scheduled
FeedNot Scheduled
0.9 MeterLost the entire night due to a problem with noise on the ccd

CommentsA wild night on the humidity roller coaster.

Reported by:Karen Butler

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