Other Names: Caldwell 27, SH2-105
Optics: Meade 10" ACF SCT at f/9.4
Mount: Paramount MX using
The SkyX Pro Camera: QSI 683WSG-8 Filters: Astrodon Ha 3nm, OIII 3nm
Exposure: 3140 Mins or
52.33 hours, [33.17 Ha, 19.17 OIII], 1800 & 1200s exposures, Binned 2x2
Accessories: Auto guided with Starlight Xpress
Adaptive Optics, Starlight Xpress
Lodestar &
PHD2.
FLI
Atlas focuser using
FocusMax 4.1.0.72 Location: Burlington, ON, Canada Date: Taken over several nights from August 5th, to September 22nd, 2017
Notes: data was acquired using
TSX Pro and
MaxPilote automation software.
Processing: Image calibration, & align in Maxim DL Pro. Levels, curves, cosmetic adjustments and crop/resize in Photoshop. BiColor mapped using the
Steve Cannistra method in PS & adjusted using selective color option. Calibrated w/32 Darks, 100 Bias, 50 Flats of each filter using natural sky flats. CCD temperature was -20C & -25C depending on the night. Image was taken from my backyard
Observatory.
Link to Ha Version: https://astromarina.zenfolio.com/p264248004/hc00d668f#hc00d668f The
Crescent Nebula is an
emission nebula in the constellation
Cygnus, about 5000
light-years away from
Earth. It was discovered by
Friedrich Wilhelm Herschel in 1792.
[2] 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 around 250,000
[3] to 400,000[
citation needed] years ago. The result of the collision is a shell and two
shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to
X-ray-emitting temperatures.