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NGC7635 - Bubble Nebula - HaSgOIII | by Cristiano Secci
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NGC7635 - Bubble Nebula - HaSgOIII

NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is a 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. 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.


Technical Data:

OTA: SkyWatcher Newton 200mm F/5

Mount: iOptron CEM60

Camera: ZWO ASI 1600 MM-C, cooled at -20C

Guide Camera: QHY-5LII Mono

Guide Scope: ArteSky 60mm F/4

Filters: Optolong Ha, OIII

Baader Coma Corrector MPCIII

Software: Sequence Generator Pro, PHD2, Deep Sky Stacker, PS

Bicolor Image with Synthetic Green channel created by following the technique of Steve Cannistra


30 frames in total, Gain 139 - Offset 21

Ha 20x120s (40m)

OIII 10x120s (20m)

Total Integration Time: 1 hour

15 Bias

11 Darks

50 Flats (25 for each channel)


1 fave
Uploaded on October 20, 2018