The Blue Horsehead Nebula (Darius Kopriva)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: 11.89 · 14 Sco) · 14 nu. Sco · 4 Oph · 4 psi Oph · 596 Scheila · B40 · B41 · HD144689 · HD144766 · HD144925 · HD144981 · HD145029 · HD145100 · HD145248 · HD145275 · HD145294 · HD145375 · HD145518 · HD145519 · HD145554 · HD145631 · HD145790 · HD145899 · HD145917 · HD145997 · HD145998 · HD146053 · HD146068 · HD146088 · And 25 more.

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The Blue Horsehead Nebula

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The Blue Horsehead Nebula

Do you recognize the Horse's Head? This is not the famous Horsehead Nebula in Orion, but a rather pale nebula that takes on a familiar shape only on long exposures. The main part of the molecular cloud complex pictured here is a reflection nebula, cataloged as IC 4592.

Reflection nebulae are composed of very fine dust that normally appears dark, but they can appear quite blue when they reflect light from energetic nearby stars. In this case, much of the reflected light comes from a star in the eye of the horse. This star is part of ν Scorpii, one of the brighter star systems in the constellation Scorpius. A second reflection nebula, designated IC 4601, surrounds two stars to the right of the center of the image.

Southern Hemisphere Astro

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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
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
Own remote observatory
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	5860297
PixInsight job	HQ3A94MF7KL5QU2YJJW33L907M27FW20
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h15m54s.47
RA (top/left)	16h06m54s.80
RA (top/right)	16h24m07s.70
RA (bottom/right)	16h24m46s.55
RA (bottom/left)	16h07m50s.72

Dec (center)	-19°27′04″.5
Dec (top/left)	-20°38′10″.6
Dec (top/right)	-20°55′11″.7
Dec (bottom/right)	-18°14′22″.1
Dec (bottom/left)	-17°57′36″.9

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The Blue Horsehead Nebula

The Blue Horsehead Nebula

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The Blue Horsehead Nebula

The Blue Horsehead Nebula

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