The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052) (Paul Lloyd)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 CMa) · 16 omi01 CMa · HD50232 · HD50304 · HD50646 · HD50680 · HD50740 · HD50781 · HD50804 · HD50896 · HD51013 · HD51036 · HD51229 · HD51550 · HD51601 · LBN 1052 · Sh2-308 · The star Udra (ο1 CMa

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The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

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The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

This nebula is an H-II region being ionized by the intense UV radiation emitted from the Wolf-Rayet star,
EZ Canis Majoris, located near its centre. The hydrogen has been emitted by this star as it slowly
degenerates into a supernova explosion as it nears the end of its life. The spectrum of this star shows
that it is devoid of hydrogen in its outer layers. The ejected hydrogen expanded outwards forming the
“bubble-like” envelope as it collided with slower moving gas released from previous ejections.

The nebula lies 4,530 ly away, and is 60ly in diameter at its widest. It can be found about 8-deg south
of Sirius, but is quite faint and thus is a challenge to be viewed with normal telescopes. It becomes more
apparent with an appropriate filter. It is estimated that this nebula was formed around 70,000 years ago,
and the ejected hydrogen is moving at some 1,700 km/sec.

The very bright star at lower right (south-west) “corner” of the nebula is omicron-1 Canis Majoris, one of
the stars makiing up Canis Major’s constellation figure. It lies in the “Dog’s” under-belly, between Adhara
and Mirzam at the rear and front feet, respectively.

Telescope: Askar 107PHQ f/7 refractor, f=750mm
Camera: ZWO ASI294MC Pro
Exposure: 48 x 300 sec, Optolong L-eNhance filter
Bortle 3-4 sky, 80% Moon waxing
Field of View: approx. 1º 21’ x 0º 58’
Image processed and prepared in PixInsight and Photoshop Elements

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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	9101846
PixInsight job	XHTUB2ME1EQ26EZ37AJ8IKUDXE1GRAA7
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h54m14s.71
RA (top/left)	06h57m12s.70
RA (top/right)	06h51m13s.62
RA (bottom/right)	06h51m15s.78
RA (bottom/left)	06h57m16s.85

Dec (center)	-23°57′32″.4
Dec (top/left)	-23°27′46″.1
Dec (top/right)	-23°28′59″.2
Dec (bottom/right)	-24°27′00″.9
Dec (bottom/left)	-24°25′50″.10

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The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

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The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

The Dolphin-Head Nebula (Sh2-308, RCW 11, LBN 1052)

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