Sh2-308 - 2018 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 omi01 CMa · Sh2-308 · The star ο1CMa

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Sh2-308 - 2018

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Sh2-308 - 2018

This object is an emission nebula located 4500 light years away in the constellation of Canis Major. The nebula is being blown out by fast winds from a hot huge Wolf-Rayet star, the bright blue one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of our Sun and are thought to be in a brief, pre-supernova phase. The gas in this nebula is primarily oxygen gas, which not only forms the object but permeates the background sky of the image.

Although the nebula is roughly spherical, it is elongated along an axis that runs from the top left to the bottom right of the image. I am not sure of the reason for this phenomenon, but it could be due to a higher gas expulsion velocity at the opposite stellar poles.

The strong whitish nebula color at the bottom of the nebula is due to the presence of significant hydrogen gas in the bottom half of our view of the sphere.

Narrowband imaging
Sharpless2 Objects
The refractors!
Cloudy Nights
ZWO ASI1600MM/QHY163M

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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.
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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	3260264
PixInsight job	KR5N6H456Q9MHEZDYBFSCKD2CRB6XUZQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h54m29s.11
RA (top/left)	06h57m00s.89
RA (top/right)	06h58m15s.72
RA (bottom/right)	06h51m59s.48
RA (bottom/left)	06h50m39s.10

Dec (center)	-23°55′04″.8
Dec (top/left)	-25°05′10″.1
Dec (top/right)	-22°56′45″.4
Dec (bottom/right)	-22°44′53″.8
Dec (bottom/left)	-24°53′03″.5

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Sh2-308 - 2018

Sh2-308 - 2018

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Sh2-308 - 2018

Sh2-308 - 2018

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