Horsehead and Flame Nebula (Shailesh Trivedi)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 50 zet Ori · Alnitak · B33 · Flame Nebula · Horsehead nebula · IC 434 · IC 435 · LBN 953 · LBN 954 · NGC 2023 · NGC 2024 · Orion B · Sh2-277 · The star Alnitak (ζOri)

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Horsehead and Flame Nebula

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Horsehead and Flame Nebula

The Horsehead Nebula (also known as Barnard 33) is in the Orion constellation. The dark nebula with cosmic dust forms the shape of a horse which is illuminated by the star Alnitak (the bright star bottom left) which is the easternmost star in Orion’s belt. The red you see is emitted from Hydrogen-Alpha (Ha) light emissions at 656.28nm wavelength. The Ha light emission occurs when Hydrogen electrons move from third to second orbit level, losing energy via light emission. The energy for Ha emissions is provided by Alnitak. Bright spots in the Horsehead Nebula’s base are young stars in the process of getting born. At the bottom left you can see the Flame Nebula also called NGC 2024. Radiation from Alnitak ionizes the Flame Nebula’s hydrogen gas emitting Ha light as previously noted. The light you are seeing emanated 1500 years ago, so you are seeing a relic.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Northern lights
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5554674
PixInsight job	XN8X8ZOM5W64CF1QJWLL1I0YJ6EEV2UW
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h41m00s.54
RA (top/left)	05h38m13s.21
RA (top/right)	05h40m02s.39
RA (bottom/right)	05h43m47s.81
RA (bottom/left)	05h41m58s.57

Dec (center)	-02°26′44″.0
Dec (top/left)	-02°12′34″.2
Dec (top/right)	-03°08′25″.8
Dec (bottom/right)	-02°40′51″.9
Dec (bottom/left)	-01°45′03″.3

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Horsehead and Flame Nebula

Horsehead and Flame Nebula

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Horsehead and Flame Nebula

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