Dolphin Head Nebula (Sh2-308) (Massimo Di Fusco)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 CMa) · 16 omi01 CMa · HD50465 · HD50492 · HD50563 · HD50591 · HD50646 · HD50679 · HD50680 · HD50740 · HD50781 · HD50804 · HD50896 · HD51013 · HD51034 · HD51036 · HD51087 · HD51112 · HD51155 · HD51176 · HD51229 · HD51407 · LBN 1052 · Sh2-308 · The star Udra (ο1 CMa

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Dolphin Head Nebula (Sh2-308)

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Dolphin Head Nebula (Sh2-308)

Sh2-308 (also known as Sharpless 308, RCW 11, LBN 1052 or commonly as Dolphin Head Nebula) is an emission nebula visible in the constellation Canis Major which is located in the central part of the constellation, about 8° south of Sirius, the brightest star in the night sky.
Sh2-308 is the large bubble surrounding the sixth-magnitude Wolf-Rayet star WR 6, also known as EZ Canis Majoris (EZ CMa). This cloud originated about 70000 years ago due to the expulsions of matter lost by the star, which, due to its strong stellar wind, was arranged all around it to form a bubble structure. The extension of the cloud is approximately 19 light years and its distance is estimated at around 1875 light years.

This photo is just the "appetizer" of ShaRA#8, whose main subject is still being acquired.

Please note: The following tables are updated every 24 hours.

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	9447434
PixInsight job	XLBONWNMIPGTU601W2OPK7NBMSOZYR5Y
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h54m20s.882
RA (top/left)	06h52m04s.354
RA (top/right)	06h52m08s.217
RA (bottom/right)	06h56m38s.689
RA (bottom/left)	06h56m32s.287

Dec (center)	-23°54′40″.21
Dec (top/left)	-23°22′41″.74
Dec (top/right)	-24°27′32″.89
Dec (bottom/right)	-24°26′28″.16
Dec (bottom/left)	-23°21′40″.56

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Dolphin Head Nebula (Sh2-308)

Dolphin Head Nebula (Sh2-308)

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Image Index:

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Dolphin Head Nebula (Sh2-308)

Dolphin Head Nebula (Sh2-308)

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