9/9/2023
SH 2-157 Lobster Claw Nebula and NGC 7635 Bubble Nebula
Sh2-157 is a nebula with a weak emission but of considerable extension visible in the constellation of Cassiopeia; it is located on the Perseus Arm and is directly connected to the large OB Cassiopeia OB2 association. The northern part of the cloud has a ring shape, caused by the action of the stellar wind of several giant stars, while the southern sector appears excited by the luminous radiation of stars of spectral class O.
Inside it there is a cluster of very young stars, which represents the latest generation of a star formation process that includes the same Cas OB2 association and the nearby open cluster NGC 7510. Wikipedia
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. Wikipedia
Imaging Data:
Provo, Utah
Bortle 5 sky
Date: 9/8/2023
Exposure= 180s X 136 for 6 hours and 48 minutes
Binning = 1×1
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
