NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star. 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 star SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight, Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm) & Astrodon SII (3nm), A
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 2800 x 1832
Dates: 24th to 28th Sep. '18
Astrodon Ha 25 x 20'
Astrodon OIII 16x 20'
Astrodon SII 12 x 20'
Total Time: 17 Hours 40 Minutes
Center (RA, Dec):(350.184, 61.182)
Center (RA, hms):23h 20m 44.119s
Center (Dec, dms):+61° 10' 56.484"
Size:45.9 x 30.1 arcmin
Pixel scale:0.984 arcsec/pixel
Orientation:Up is 351 degrees E of N