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LTO Report

Kitt Peak Nightly LTO Report For UT: 2018-12-13

Report Time (MST): 06:08                    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)
Dewpoint Temperature (°C)-6.8-2.5-14.11.8
Relative humidity (%)5162266.6
Wind Speed (mph)28.443.815.04.0
Wind Direction (°)314266521.0
4M Dome Temperature (°C)
4M Dome Dewpoint (°C)
4M Primary Mirror (°C)

Weather Comments: Gusting winds increasing from 5-10 mph. to around 25 mph. slowly through the night, and moving from south to north at the same pace. Humidity erratic until about 22:00. I smoothed out after that, but stayed below the ODI or telescope closing threshold. Colder tonight than it has been.
Recognized Hours: ( 11.5 )      18 degree twilight + 0.5 hr.

Observer Information
Telescope Observer Prop. # Instrument Detector Seeing
4 MeterNo Observer 2018A-0922 N/A N/A N/A
WIYNRosenwasser -remote- 2018B-0377 ODI N/A 2.3
2.1 MeterNo Observer --- N/A N/A N/A
FeedNo Observer --- N/A N/A N/A
0.9 MeterHui, Graykowski, Ye --- 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)
11.5 Shutdown      
10.75 Scientific Research   0.75 Weather 19:30 - 20:30
0.0 Scientific Research      
0.0 Scientific Research      
10.5 Scientific Research   1.0 Instrument Problem 19:00 - 06:00

Observing Status
4 MeterMayall shutdown in preparation for DESI.
WIYNLost 0.75 hr. to humitiy above ODI's limit. Seeing some "wind shake"? in images - see MSR #27580. See was not at all good tonight the range was from about 0.53 to 4.4 arcseconds, median around 2.3 arcseconds. Note the 0.53 arcsecond seeing was only a cople images at the very start of the night.
2.1 MeterNot Scheduled
FeedNot Scheduled
0.9 MeterLost about an hour total to shutter problems throughout the night. No seeing measurements taken.

CommentsWith all that it was beautifully clear tonight.

Reported by:Doug Williams

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