2015-09-16
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CDK20N

Sloan filters

John Kielkopf


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2017-04-11
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Reprocessed to add WCS with concurrent bias, flat and dark fields 


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ngc884_00074_g_dfw.fits
TARGET  =  NGC 884
EXPTIME  =  100.0
FILTER  =   g_(400-530)
DATE-OBS  =  2015-09-17T05:35:27.069
INSTRUME  =  

ngc884_00075_r_dfw.fits
TARGET  =  NGC 884
EXPTIME  =  100.0
FILTER  =   r_(530-700)
DATE-OBS  =  2015-09-17T05:38:17.903
INSTRUME  =  

ngc884_00076_i_dfw.fits
TARGET  =  NGC 884
EXPTIME  =  100.0
FILTER  =   i_(700-825)
DATE-OBS  =  2015-09-17T05:40:57.182
INSTRUME  =  


Color image composite locked to WCS positions

i -> r
r -> g
g -> b

Log map with zero set slightly above sky  to give dark background
g scale is 2x r and b