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Horsehead Nebula in Ha



B 33 and IC 434: Horsehead Nebula in Orion

RA= 5 hrs 40 min; Dec = -2 deg 27 min

Date & Site:

Imaged on 10/25/16; Joshua Tree National Park

Conditions: temps in the low 50's; calm; very good seeing


Telescope: DSI RC10c

Guider: SBIG guidehead/Hutech OAG5

Mount: AP 1100 CP3
Camera: ST-10XME; CFW10; Astrodon 3nm Ha filter



Exposures: 2 hours of Ha (15 minute subs)

This nebula is located just to the south of Alnitak, the farthest west star on Orion's Belt.

Ionized hydrogen gas behind the dark nebula is ignited by the nearby bright star Sigma Orinis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming.

The Horsehead Nebula is approximately 1500 light years away.

(image reduced to 60% of original size)

FOV = 23 x 15 arc minutes

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