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NGC 688- The Crescent Nebula
18' x 12'
5000 light years
2013 June 12 to 21
Hyperion 12.5" Astrograph
ST-402 - OAG
1 x 1
Luminance: 33 x 10'
Color: B 15x10', G 18x10', R 18x10'
Acquisition with CCD Commander & MaxIm DL
Calibration with CCD Stack2
Processing with PixInsight
The Crescent nebula is an emission type nebula. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding
with and energizing the slower moving wind ejected by the star when it became a red giant (courtesy Wikipedia). Being in the Milky Way
explains the multitude of surrounding stars.
Processed with PixInsight, without any sharpening. Acquisition was taken when the moon was half to 3/4 full (but one cannot dictate weather
and does what one can when the clouds are gone...). Even so, there is quite a bit of depth and while the result would certainly be much
better in a dark site, getting this 30 miles from NYC is like a treat.