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Bubble Nebula



NGC7635- Bubble Nebula in Cassiopeia

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

Date & Site:

October 9-10, 2015; Mount Palomar

Conditions: mixed seeing; 67 degrees; mild winds to calm


Telescope: TEC 140 Refractor; 980mm fl at f/7

Mount: AP1100 GOTCP3
Camera: ST-10XME; CFW10; Hutech OAG5 with autoguider

Astrodon Ha (3nm) and RGB filters


Exposures: 4 hrs of Ha, 45 minutes each of RGB for a total of 6.25 Hrs.

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.

The bubble itself is 10 light years across.

Field of View = 52 x 35 arc minutes

Reduced 69% of original size

11,000 light years away

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