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ENR CTIO Blanco 4-m 2013-01-22

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Date: 
Tuesday, January 22, 2013
Telescope: 
CTIO Blanco 4-m
Submitter: 
Lyndsay Old
Submitter Email: 
ppxlo@nottingham.ac.uk
Observer Support: 
Hernan Tirado
Night Assistant: 
Alberto Alvarez
Also Present: 
DG, KH, AM, CM
Problems: 
  • 18:41 local time: encountered a problem with the Backplane 1 Vsub panel on the telemetry viewer. View displayed 'No data' however SISI interlock viewer did not show any errors. Fixed eventually by restarting the instance.
  • 21:38 local time: some kind of problem with the air support, telops moved to the zenith and problem was fixed within ~10minutes.

Problems from the second half of the night:

  • Previous nights of this run for our time domain survey have produced images that suffered from elongation in the RA drection. Ellipticitiy measurements were very often greater than 0.1. Tonight, however, the first 2.5 hours of the second half (5:04 through 7:30 UT) had generally good image quality. Then, for our pass through the survey sequence between 7:35 and 8:43 UT the elongation returned and again produced elevated ellipticity measurements. We did a fourth pass through (only Y band) starting at 8:48 UT and running into twilight and these images again were good. We suspect that reducing the frequency of short slews (of order the FoV) may reduce the elongation effects, but this is only a weakly constrained correlation with non-statistical analysis.
Comments: 

Good night on the whole: seeing got down to ~0.7''.

Second half also very good. Cloudless sky.smiley

Conditions: 
General Conditions
Temperature Max: 
18.60
Temperature Min: 
15.70
Humidity Max: 
63
Humidity Min: 
21
Wind Speed Max: 
6.30
Wind Speed Min: 
0.00
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky : 
0
2nd Quarter
Clouds: 
Clear
Seeing Value: 
0.80
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Seeing Value: 
1.00
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2012B-0003
Target of Oportunity: 
No
Time Observed: 
4.0
Time Engineering: 
0.25
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
des sv
Primary Investigator: 
Frieman
Email: 
frieman@fnal.gov
Institution: 
Fermilab
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
4.25
Proposal: 
2012B-0363
Target of Oportunity: 
No
Time Observed: 
4.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Time Domain survey
Primary Investigator: 
Bloom
Email: 
cklein@berkeley.edu
Institution: 
U.Berkeley
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
4
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2013-01-22 8.0 0.25 0.0 0.0 0.0 8.25