Horsehead Nebula (Andrew Arai)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: Flame Nebula · IC 432 · IC 434 · IC 435 · NGC 2023 · NGC 2024 · Orion B · The star Alnitak (ζOri)

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Horsehead Nebula

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Horsehead Nebula

The Horsehead Nebula is named after the distinctive shape of dust hiding portions the brighter glowing gas in the background slightly right of the middle of this image. The red background to the Horsehead is from ionized hydrogen gas that is heated by nearby stars. The cream-colored nebula in the lower left portion of this image is called the Flame Nebula and represents light generated by a cluster of newly formed stars hidden by gas and dust between us and the nebula. Denser gas and dust blocks more of the light to from the complex dark portions in the middle of the Flame nebula. Bluish portions of the image result from bright blue-white starlight reflecting off dust in their vicinity. This combination of different colors makes this a popular target for astrophotographers. The colors in this scene are usually not appreciated when looking through the telescope but become quite distinctive on long exposure photographs. This region is located in the constellation Orion near the bright star Alnitak, the brightest star in this image and the eastern most star in the Belt of Orion, the three bright stars in the middle of the constellation.

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
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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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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.

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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	Basic success
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Astrometry.net job	5356025
PixInsight job	n/a
PixInsight queue size	n/a
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