Dolphin Head Nebula (Sh2 308) (Ryan)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 omi01 CMa · HD50232 · HD50260 · HD50304 · HD50492 · HD50535 · HD50563 · HD50590 · HD50591 · HD50646 · HD50679 · HD50680 · HD50710 · HD50740 · HD50781 · HD50804 · HD50853 · HD50895 · HD50896 · HD50939 · HD51013 · HD51034 · HD51036 · HD51087 · HD51112 · HD51113 · HD51155 · HD51176 · HD51229 · HD51407 · And 5 more.

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Dolphin Head Nebula (Sh2 308)

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Dolphin Head Nebula (Sh2 308)

This was taken in my back yard (Bortle 8/9) over the course of a couple weeks. A very challenging target because the signal is very dim and the object is low in the sky so I could only get a few hours a night on it.

Integration

- 165 x 60s each in R, G, B ( 8.25h )

- 137 x 300s Ha ( 11.4h )

- 159 x 300s Oiii (13.25h )

This was also the first target with my new WO FLT 132, new mount (iOptron CEM 70), new focuser, new guide scope, and new filters. So a spent a good bit of time trying to get things dialed in.

From Wikipedia:

Sh2-308, also designated as Sharpless 308, RCW 11, or LBN 1052,[1] is an H II region located near the center of the constellation Canis Major, composed of ionised hydrogen.[2] It is about 8 degrees south of Sirius, the brightest star in the night sky. The nebula is bubble-like (hence its common name, the Cosmic Bubble), surrounding a Wolf–Rayet star named EZ Canis Majoris. This star is in the brief, pre-supernova phase of its stellar evolution. The nebula is about 4,530 light-years (1,389 parsecs) away from Earth,[3] but some sources indicate that both the star and the nebula are up to 5,870 ly (1,800 pc) away.[4][5] Yet others indicate the nebula is as close as 1,875 ly (575 pc) from Earth.[6]

The nebula was formed about 70,000 years ago by the star EZ Canis Majoris throwing off its outer hydrogen layers, revealing inner layers of heavier elements.[2] Fast stellar winds, blowing at 1,700 km/s (3.8 million mph) from this star, create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of the star's evolution. The hydrogen composing the nebula is ionised by intense ultraviolet radiation.[9] The nebula is approximately 60 light-years across at its widest point.[10]

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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
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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	4159818
PixInsight job	BFR2J1XL7NA8APN1S9QM8MABW48UZUXC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h54m08s.35
RA (top/left)	06h50m21s.10
RA (top/right)	06h54m16s.60
RA (bottom/right)	06h57m57s.20
RA (bottom/left)	06h54m00s.23

Dec (center)	-23°44′47″.5
Dec (top/left)	-23°23′58″.9
Dec (top/right)	-24°40′52″.5
Dec (bottom/right)	-24°05′17″.10
Dec (bottom/left)	-22°48′43″.0

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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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