Proposal:
2013A-0351
Target of Oportunity:
No
Time Observed:
8.0
Time Engineering:
0.0
Time lost technical:
1.25
Time lost weather:
0.0
Time lost other:
0.0
Description:
Large scale structure in COSMOS field
Primary Investigator:
Dey
Email:
dey@noao.edu [1]
Institution:
NOAO
Instrument:
CTIO 4m DECam
Organization:
NOAO
Total Program Time:
9.25
Good night with good seeing (~1" in U and g). We think that the image quality in long exposures (>10 min) would be better if the focus was tweaked to follow changed in the truss temperature during the observation. Currently, it seems like the focus is only adjusted at the start of an observation. We can see the focus / image quality slowly deteriorate over the duration of an exposure.