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NGC 7635 (Bubble Nebula, LBN 548, Sh 2-162) - bright emission nebula in Cassiopeia

Narrowband SHO combination (SHO sequence taken on 24.08.2012) (Click for a larger view 1600 x 1600 px)

 

Narrowband SHO combination - 100% crop (Click for a larger view 1600 x 1600 px)

 

Narrowband Ha (Click for a larger view 1600 x 1600 px)

 

LRGB combination (LRGB sequence taken on 19.07.2012) (Click for a larger view 1200 x 1200 px)

 

Details

NGC 7635 (Bubble Nebula, LBN 548, Sh 2-162) - bright emission nebula in Cassiopeia

Discovered by William Herschel in 1787.

NGC 7635 is located about 11000 light years away and is known as The Bubble Nebula. The image reveals an expanding shell of glowing gas surrounding a hot, massive star in our Milky Way Galaxy cataloged as BD+602522. The strong stellar winds of material and radiation is produced by the bright star at the left into the bubble . This star is 10 to 20 times more massive than our Sun and several hundred thousand times more luminous. A fierce stellar wind and intense radiation from that star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud.

North is up. The Horizontal FOV is about 36' (slight crop from original FOV). The image almost centered at:

Right Ascension 23 : 20.7 (h:m)
Declination +61 : 12 (deg:m)
Distance 11 (kly)
Brightness - (mag)
Apparent Dimension

15 (arc min)

Seeing: Pickering 8 rating - Very Good to Excellent
Optic(s): RC 12" with Astro-Physics corrector @ f/5.4
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik Ha, OIII, SII, and L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-07-19 (LRGB) and 2012-08-24 (Narrowband)
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

Ha = 105 min, OIII = 45 min, SII = 60 min, subs. 15 min, Bin1, Total Exposure Time narrowband- 210 min

L=30 min, R = 30 min, G = 30 min, B = 30 min, subs. 10 min, Bin 1, Total Exposure Time - 120 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided
Processing:

PixInsight / PS

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