The Dolphin Head Nebula from Coastal Southern California (Sh2-308) (Roger Webster)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 CMa) · 16 omi01 CMa · HD50154 · HD50155 · HD50176 · HD50212 · HD50304 · HD50376 · HD50465 · HD50492 · HD50493 · HD50535 · HD50563 · HD50590 · HD50591 · HD50646 · HD50647 · HD50679 · HD50680 · HD50710 · HD50711 · HD50740 · HD50781 · HD50804 · HD50853 · HD50895 · HD50896 · HD50939 · HD51013 · HD51034 · And 23 more.

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The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

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The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

The Dolphin Head Nebula, aka Sh2-308, never gets above about 30 degrees altitude from our house, where this was imaged (Bortle 6-7 skies). I got lucky in December/January with a few nights of clear skies, not too much moon, and good seeing (though a target this low has a lot of atmosphere in front of it).

This is basically an HOO image, though I did gather some SII and merged it with the Ha data. The stars were done with R, G, B filters.

The star at almost the very center is a Wolf-Rayet-type star: big and hot. I will likely continue to gather data on this over time to try to further reduce the noise. As the saying goes, you know you have enough data when you are no longer willing to double what you already have.

It's in Canis Major, about 4,500 light-years away, and is also known as RCW 11 and LBN 1052.

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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.

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Status	Advanced success
Started	...
Astrometry.net job	9045830
PixInsight job	9B6GH4YBE28JBMBBDXX92YB7TO5DRDT5
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h54m14s.730
RA (top/left)	06h52m32s.971
RA (top/right)	06h50m04s.732
RA (bottom/right)	06h55m56s.742
RA (bottom/left)	06h58m20s.396

Dec (center)	-23°55′38″.60
Dec (top/left)	-22°43′56″.21
Dec (top/right)	-24°45′07″.77
Dec (bottom/right)	-25°07′14″.73
Dec (bottom/left)	-23°05′45″.94

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The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

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The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

The Dolphin Head Nebula from Coastal Southern California (Sh2-308)

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