Bubble Nebula, also known as NGC 7635 , Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel.
The Lobster Claw Nebula (Sharpless 157), is a bright emission nebula, and is clearly visible at the bottom.
Captured by: Ahmed Rizwan Khan
Dates: April 5, 2019, April 6, 2019, April 7, 2019
Telescope: SkyWatcher Esprit 100 ED f/5.5 APO
Imaging camera: ZWO ASI1600MM-Cool
Mount: Skywatcher NEQ6 Pro
Guiding telescope: Solomark F60 60mm guidescope
Guiding camera: QHY5L-II Mono Guide Cam
Software: Pleiades Astrophoto PixInsight 1.8
Filters: Astronomik 6nm OIII, Astronomik 6 nm Ha, Astronomik 6nm SII
Accessory:Lakeside Electronic Focuser
Resolution: 4257×3408
Frames:
- Astronomik 6 nm Ha: 80×300″ bin 1×1
- Astronomik 6nm OIII: 80×300″ bin 1×1
- Astronomik 6nm SII: 80×300″ bin 1×1
Integration: 20.0 hours
Darks: ~100
Flats: ~50
Bias: ~100
Avg. Moon age: 1.07 days
Avg. Moon phase: 1.95%
Bortle Dark-Sky Scale: 8.00
Astrometry.net job: 2652116
RA center: 349.339 degrees
DEC center: 60.368 degrees
Pixel scale: 1.413 arcsec/pixel
Orientation: 285.438 degrees
Field radius: 1.070 degrees
Data source: Backyard
