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ENR CTIO Blanco 4-m 2013-09-15

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Date: 
Sunday, September 15, 2013
Telescope: 
CTIO Blanco 4-m
Submitter: 
Maayane Soumagnac
Submitter Email: 
mts@star.ucl.ac.uk
Observer Support: 
Alberto Alvarez
Night Assistant: 
Leonardo Paredes
Problems: 
*Problems*
 
# At 8.29 pm the comfort display is not working and we get similar errors to the previous night: see night summary for MJD 56542): the image builder is complaining that ccds extensions are missing
# At 8.30 load in Kentools gives this error for exposure 234126: Unexpected eof in HdrRead
# We reconfigure and take a new exposure
# At 8.33 after reconfiguration we still have the same error
# We could not turn Vsub off
# We restarted SISPY
# At 8.46 the comfort display comes back
# The exposures which did not work are between 234126 and 234130 which was about 17 minutes. 
# The first one working was 234130
# Exposure 234130 looks weird 234131 and 234132 looks ok
# As a result of this incident, we did not take standards.
Comments: 
*Minor Problems and Relevant Information*
 
# When taking the flat fields in the evening, we get slightly higher counts in Z and Y than the nominal.
# At 9 pm the wind was 15 mph, so we closed the lateral louvers and raiseddDECaB1anc04mDECamObserver the screens
# At 10 pm: the humidity is high and therefore the seeing is quite bad. We double check with the other telescopes operators that they get the same bad seeing as us (2.36 at 10.04).
# QR crashed at 10 pm. With the help of Ann we restarted it and it is now working
# At 22.30 the wind speed was lower so we opened the louvers back
# At 11:46 we got an error message when loading in Kenttools: Unexpected eof in HdrRead. It then works after several times. This then happened again several times. 
# If the observer console disappears, and we have to press F5 in order to reload it, all the previously taken images taken to a certain point do not show anymore in the exposures history. And then for the current active exposure, it does not show wether it is delivered or not. Is this a gui problem?
# at 3.51 am after 234417, the queue went empty. We had to press "go" to make it work again. obstac was running all the time (it's not that it disabled itself like before, it just let the queue run empty)
# at 4.05 am, the wind speed is 15 mph, and the ellipticity increases, so we ask the operator to close the louvers.
# The seeing went very high towards the end: 3.16 arcsec for the last exposure 234510!
Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Wind: 
High
Seeing Value: 
2.50
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky : 
1
2nd Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Wind: 
High
Seeing Value: 
2.50
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
1
3rd Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Wind: 
High
Seeing Value: 
2.50
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
1
4th Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Wind: 
High
Seeing Value: 
2.50
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
1
Program: 
Proposal: 
2012B-0001
Target of Oportunity: 
yes
Time Observed: 
10.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Dark Energy Survey
Primary Investigator: 
Josh Frieman
Email: 
frieman@fnal.gov
Institution: 
CTIO
Instrument: 
CTIO 4m DECam
Organization: 
Chile
Total Program Time: 
10
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2013-09-15 10.0 0.0 0.0 0.0 0.0 10