obtain the sky brightness in optical b, v, and r photometric bands above dome a site
Post on 23-Feb-2016
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• Obtain the sky brightness in optical B, V, and R photometric bands above Dome A site
• To measure the cloud cover extent during the 2009 and 2010 winter seasons• Extended to 2011 by NSF
• To provide aurora and airglow statistics
• Photometry of bright target stars in field with unprecedented window function
$ Meet budget of ~$50k (NSF OPP/AST award) excluding logistical costs• All logistical costs provided by
PRIC/China collaboration
Gattini-DomeAGoals of experiment
• 90o FoV transit camera + Optic ‘IFW’ filter wheel (B, V, R, >650nm)
• Apogee Alta ‘U4000’ 2kx2k interline CCD with 7.4 micron pixels
• AF DX Fisheye-Nikkor 10.5mm f/2.8G ED results in ~2.4arcmin/pix,
aperture ~few mm
• Continuous observations:– 100s B 30s B– 100s V 30s V– 100s R 30s R– 100s OH 30s OH– 100s dark– BIAS frame– REPEAT
Camera, Data
V sky brightness, whole season
• CAUTION: more work needed to assess effect of imperfect baffling (are we measuring true sky brightness or instrument performance?)
Photometry
• Strongly suspect “cloud” equals local snow obscuration lifted by wind in many cases
‘Cloud’ cover
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