GSPC-II Program GOAL: • extend GSPC-I photometry to B = V ˜ 20 • add R band to calibrate red second- epoch surveys HOW: • take B,V,R CCD exposures centered at GSPC-I faintest star OR • conveniently close to POSS-II centers (for POSS-II offset plates)
GSPC -II Program. GOAL: extend GSPC-I photometry to B = V ˜ 20 add R band to calibrate red second-epoch surveys. HOW: take B,V,R CCD exposures centered at GSPC-I faintest star OR conveniently close to POSS-II centers (for POSS-II offset plates). The Data. - PowerPoint PPT Presentation
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GSPC-II Program
GOAL:
• extend GSPC-I photometry to B = V ˜ 20
• add R band to calibrate red second-epoch surveysHOW:
• take B,V,R CCD exposures centered at GSPC-I faintest star OR
• conveniently close to POSS-II centers (for POSS-II offset plates)
The Data
• Given the long time span of this survey project, data come from different telescopes as well as different CCD cameras
• Size of camera fields vary from ˜ 3.5 arc minutes to ˜20 arc minutes
• Pixel scale ranges from ˜ 0.35 arc seconds/pixel to ˜ 0.7 arc seconds/pixel
• When appropriate, both long and short exposures are acquired
• Pre-selected sets of standard stars from the Landolt catalog are observed each night