A Bubble in Cassiopeia

Admittedly, this target has always intrigued me but it has escaped because of competing interests in this constellation. Well the adage “better late than never” fits the capturing of this target. Meet the Bubble Nebula (NGC 7635), a hydrogen-rich region emission nebula located in the constellation of Cassiopeia.

The “bubble” is created by a flow of air ejected from the massive hot, young central star SAO 2057. The nebula lies approximately 8,000 light years away from Earth, and is measured some 10 light years across. To place in perspective, it is larger than twice the distance from Earth to its nearest star. Wow! That’s incomprehensibly large!

Rise of Cassiopeia (shot with iPhone 14)

The wide field image of NGC 7635 and surrounds shows the hydrogen alpha and oxygen 3 rich regions, which together make for a beautiful rendition. Make sure to zoom into the center of the image to see the bubble. At the bottom left corner is portion of the Lobster Claw Nebula (Sh2-157), a target that we will soon explore… if skies permit. In the meantime, remember to look up and experience an amazing Universe!

Gear: AA Hypercam 26C, Askar 80 PHQ, HEM27 mount, Optolong L-Ultimate; ZWO OAG + AA120mc

Exif: 68 x 5-min lights; Gain 200, Offset 3, TEC @ 10 degrees; 20 darks,

SharpCap, PHD2; AstroPixelProcessor, PixInsight; Photoshop


  1. Wow! I am constantly amazed with the amount of color, texture, and detail that is now possible. Astrophotography has really come a long way! Nice job, me son! 👍💯😃

      1. Yes definitely an interesting Target and I’m sure revisiting a number of times! 😎👍

  2. Hi Drexel. I really enjoyed your commentary. Do you have a still image? Because I am nearly blind, I can’t see the video unfortunately. If you don’t have a still image, that’s ok. Thanks.

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