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NGC 688- The Crescent Nebula
Object
Imaging
Processing
Object type
Size
Magnitude
Constellation
Distance
Size
Magnitude
Constellation
Distance
Emission Nebula
18' x 12'
7.4
Cygnus
5000 light years
18' x 12'
7.4
Cygnus
5000 light years
Date
Location
Telescope
Mount
Camera
Guiding
Binning
Exposures
Total Time
Location
Telescope
Mount
Camera
Guiding
Binning
Exposures
Total Time
2013 June 12 to 21
Pleasantville, NY
Hyperion 12.5" Astrograph
MI-250
FLI ML-16803
ST-402 - OAG
1 x 1
Luminance: 33 x 10'
Color: B 15x10', G 18x10', R 18x10'
14 hours
Pleasantville, NY
Hyperion 12.5" Astrograph
MI-250
FLI ML-16803
ST-402 - OAG
1 x 1
Luminance: 33 x 10'
Color: B 15x10', G 18x10', R 18x10'
14 hours
Acquisition with CCD Commander & MaxIm DL
Calibration with CCD Stack2
Processing with PixInsight
Calibration with CCD Stack2
Processing with PixInsight
Comments
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.
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.