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LTO Report

Kitt Peak Nightly LTO Report For UT: 2017-12-10

Report Time (MST): 06:20                    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)9.912.27.31.4
Dewpoint Temperature (°C)-14.7-12.3-16.41.0
Relative humidity (%)1623123.0
Wind Speed (mph)
Wind Direction (°)101343800.1
4M Dome Temperature (°C)8.910.27.00.9
4M Dome Dewpoint (°C)-12.4-9.4-16.51.3
4M Primary Mirror (°C)

Weather Comments: Variable overcast all night. Moderate to strong winds from the east 20-50mph at the summit but lower on the southern end of the mountain.
Recognized Hours: ( 11.5 )      18 degree twilight + 0.5 hr.

Observer Information
Telescope Observer Prop. # Instrument Detector Seeing
4 MeterRobles, Dickenson 2016A-0453 MOSAIC N/A 1.7
WIYNGosnell - remote 2017B-0089 HYDRA STA1 1.5
2.1 MeterRiddle 2015B-3001 Visitor N/A N/A
FeedNo Observer --- N/A N/A N/A
0.9 MeterDeliyannis 2017B-0922 HDI N/A 1.4

Time Usage During The Night
Telescope Hours Used Night's Activity   Hours Lost Time Lost
Due To:
Time of
Night (MST)
9.25 Scientific Research   1.5 Weather 21:00 - 06:30
      0.75 Instrument Problem 02:00 - 04:30
8.0 Scientific Research        
3.5 Other        
11.5 Other        
0.0 Scientific Research      
      11.5 Weather 18:30 - 06:30

Observing Status
4 MeterLost 45 minutes between 2100 and 2145 when we had to close for high winds. Lost 45 minutes at the end of the night because of clouds. Lost 45 minutes to a Mosaic timeout and an instance of images not being read to disk. In both cases, restarting Mosaic solved the problem. Seeing ranged from 1.3 to 2.7 arcsec. Typical seeing was around 1.7 arcsec.
WIYNThe PMS fluid chiller faulted at the start of the night, requiring a couple of restarts to get going. See MSR 25968 for details. No other problems. Seeing ranged from 1.2 to greater than 2.5 arcsecs as estimated from the fops. Typical seeing around 1.5 arcsec.
2.1 MeterNo answer when called at 0544.
FeedNot Scheduled
0.9 MeterNo technical problems, but no useful data because of the clouds. Did manage a focus observation, which yielded a seeing of 1.4 arcsec.

CommentsAlthough never deemed threatening, the clouds made it a difficult observing night.

Reported by:Dave Summers

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