2017-02-25
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CDK20N

John Kielkopf

Sloan griz filter set


M61
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5 exposures each at 100 seconds
scaled dark and flat-fielded
astrometry added
coadded with swarp for an equivalent 500 seconds in each filter

Color image is a square-root stretch composited in ds9 -rgb
Map is i -> red, r -> green, g -> blue