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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 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 November 1787 by William Herschel.
LBN 540 is an emission nebula located in the constellation Cassiopeia, approximately 11,000 light-years from Earth. Also called the Lobster Claw It gets its name from its distinctive shape. The nebula is characterized by bright, glowing gas and dust, sculpted by the powerful stellar winds of massive, young stars within it.
M52 Star Cluster lies to the left of the Bubble Nebula in this image.
Imaging telescope: Takahashi FSQ130ED
Imaging camera: ASI 2600MM
Mount: JTW Trident P75
Guiding telescope: Takahashi FS60CB
Guiding camera: QHY 5L II M
Focal Extender / Reducer: 0.73X
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor, PixInsight.
Filters: Astrodon Ha (3nm), Astrodon SII (3nm), Astrodon OIII (3nm), Astrodon RGB.
Accessories: Robofocus Focuser controlled by Lunatico Armadillo, ATIK EFW 3, RB Focus Gaius, RB Focus Excalibur.
Dates: 25th Sep. – 2nd Oct. 2025
Frames: (Total)
Astrodon Ha 30 x 600″
Astrodon SII 30 x 600″
Astrodon OIII 30 x 600″
Astrodon RGB 3 x 60 x 60″
Total integration = 18 Hours .