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NGC 7635


NGC 7635: Bubble Nebula in Cassiopeia

RA = 20h 21 min; Dec = 61 deg 12 min

Date & Site:

Imaged on 08/27/13; Runningman Observatory, Carlsbad, CA

Clear; average transparency, average seeing


Telescope: Astro-Tech 8" RC OTA F8 FL= 1625 mm

Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with Astrodon filters;

Prime focus guiding


Exposures: 3 hrs 10 min of Ha; 50 min each OIII and SII for a total of 4 hrs 50 min

Color mapped by assigning Ha to Red; OIII to blue and SII to green

FOV = 17.4 x 15.4 arc minutes

This planetary nebula was created from massive outflow of a Wolf-Rayet 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. The "bubble" is surrounded by a large region of diffuse hydrogen.

Located 11,000 light years away

The bubble itself is 10 light years across.

Cropped and reduced 60% from original

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