Some clouds around, mostly clear.
High frequency readout noise can be seen in the images.
All darks before 0019 are bad - blank mask was not in, light in dome
good darks 60sx2 are 23-27
darks 4s are 28-32
6:29pm start sky flats
J-band flats are 33-42, counts ~13,000
J-band flats 43-52, counts ~5,000
6:43pm finished sky flats
6:58pm collimated, ~0.9" median seeing, background still bright
7:00pm Started integrating on 0850 (Ken's target), first image is 0053
8:10pm First noticed some smearing of images, changing over field and with time, might apply to all previous images. Seeing still looks good (~0.65")
9:30pm Stopped integrating on 0850, switching over to COSMOS (Linhua's target) for spectroscopy
9:32pm COSMOS acquisition
9:46pm Started integrating with longslit on target, seeing ~0.8", first image is 0117
10:02pm Pickup noise not apparent in spec data
10:19pm Some clouds, might be clearing soon, it is not very bad. the seeing is 0.7-0.8"
11:52pm New sequence of exposure. the seeing is 0.6"
12:41am seeing is 0.5" to
1:58am go to the standard ukirt_fs128 good standard star
2:38am go to J1306. seeing is 0.4"-0.5''
6:10am The observing is done.
- 03 Mar 2013