NGC 7635, also known as the Bubble Nebula, 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.
Imaging Data:
Provo, Utah
Bortle 5 sky
Date: 7/14,15,16/2023
Exposure = 180s X 340 (17h) of which 131 were used for 6h 33m
Binning = 1×1
Camera Temperature = 0 deg C
Camera Gain = 100
Filter = IDAS-NBZ Narrowband Filter
Camera: ASI2600MC PRO in Hyperstar IV configuration.
Telescope: Celestron 1100 Edge HD
Mount: 10Micron GM1000HPS
Processed with DSS, PI and PS