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| Classification: |
Bright Diffuse Emission Nebula / Caldwell C11 / Sh2-162 |
| Constellation: |
Cassiopeia (Cas) |
| Object Location: |
Ra 23h 21m 28s Dec +61° 17’35° (current) |
| Size & Distance: |
15x15 Apx 7,100 light-years |
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| Date & Location: |
07-26-14 Palomar Mountain |
| Exposure: |
SHO-RGB 60, 60, 60, 2, 2, 2, Sll=R, Ha=G, Olll=B, 6 x 10ea RGB 4 x 2 ea. (bin 1x1). |
| Optics: |
Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160 F/L 940mm |
| Mount: |
Astro-Physics 1200 GTO / ATS 10x36 pier. |
| Camera: |
FLI-MLx694 @-20c / CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG. |
| Filters: |
Astrodon 3nm Ha, Sll, Olll |
| Software: |
MaxImDL 6.03, Photoshop CC, CCDStack, Topaz |
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| Notes: |
Sky conditions: Average seeing, calm winds, Temp 75°
Image Field of view is 36 x 45 arcmin. Image Scale 0.72 arcsec/pix
RGB were used just for the stars.
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NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude star. 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.
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