Image Description and Details : NGC 7635 The Bubble Nebula captured by David Wills at PixelSkies, Castillejar, Spain

Red 583 x 30s
Green 1483 x 30s
Blue 468 x 30s
Ha 74 x 300s

21 hrs 8 mins hours in total.

Equipment used:

Telescope: Celestron 8" Edge HD

Camera: Xpress Trius SX-694 Pro Mono Cooled to -10C (Binned x2)

Image Scale: 0.8

Guiding: OAG

Filters: Astronomik Ha

Mount: iOptron CEM60 "Standard" GOTO Centre Balanced Equatorial Mount

Image Acquisition: Voyager

Observatory control: Lunatico Dragonfly

Stacking and Calibrating: Pixinsight

Processing: Pixinsight 1.8, Photoshop CC

Copyright: David Wills

A unique celestial object, a soap bubble-shaped nebula called ngc7635, discovered in 1787 by William Herschel, an English astronomer. The nebula is located in the constellation of Cassiopeia (between Cassiopeia and Cepheus in fact) and its diameter is about 10 light years. This bubble shape is designed thanks to the stellar wind created by the star SAO 20575, just next to it, a little off-centered, very dense and warm. This star is expected to explode as a supernovae in a few tens of millions of years.

This image results from the composition of photos taken with different color filters and in H-Alpha for fine details.