Proposal:
2012B-0001
Target of Oportunity:
No
Time Observed:
10.25
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
Institution:
Fermilab
Instrument:
CTIO 4m DECam
Total Program Time:
10.25
Louver windows and windscreen were kept closed for most of the time because of wind.
Telescope pointing offset measured at beginning of night: RA = -11.8"; Dec=1.8. Residual offsets after pointing correction: RA=-2.0"; Dec=5.0"
We notice that Y band exposures tend to have systematically larger ellipticity than other filters.