Horsehead and Flame Nebulas (Bruce Rohrlach)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: Horsehead nebula · IC 434 · NGC 2023 · NGC 2024 · The star Alnitak (ζOri)

Horsehead and Flame Nebulas, Bruce Rohrlach

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Horsehead and Flame Nebulas

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Horsehead and Flame Nebulas

Clockwise from bottom-left:

1. Flame Nebula (NGC 2024) - an emission nebula in Orion and parent to a cluster of young stars embedded within the nebula. Several broad dust lanes bisect the nebula. The emission wavelengths are primarily due to hydrogen which is ionised and made to luminesce by radiation from the eastern-most star in Orions Belt - Alnitak.

2. Alnitak (the brightest 'star' in this image) is a triple star system in Orion, the name coming from Arabic (an-nitaq) meaning ... the girdle. The largest of the triplet, a blue supergiant star, radiates mostly at ultraviolet wavelengths, thus it is intrinsically brighter than is visible to our eyes, and has a total luminosity around 100,000 suns, hence it's ability to ionise the gases within the adjacent Flame Nebula.

3. The Horsehead Nebula (Barnard 33) is a small dark nebula silhouetted against the glow of the emission nebula IC 434 and is one of the most photographed features in the night sky. It is a dark globule of dust and non-luminous gas that obscures the light from the moderately bright nebula IC 434 behind it.

4. The reflection nebula at around 7.30 from the Horsehead Nebula is NGC 2023.

The total exposure from 4 filters to build up this image was 1 hour 50 minutes. Just learning the ropes here with acquisition using a cooled mono astro-camera and the critical data processing.

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Status	Basic success
Started	...
Astrometry.net job	2097254
PixInsight job	n/a
PixInsight queue size	n/a
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Horsehead and Flame Nebulas

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