Dolphin Head Nebula SH2-308 (Linwood Ferguson)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 omi01 CMa · LBN 1047 · LBN 1052 · Sh2-303 · Sh2-308 · The star ο1CMa

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Dolphin Head Nebula SH2-308

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Dolphin Head Nebula SH2-308

The Dolphin Nebula has name of "Sharpeless" 2-308. With a little imagination "Dolphin" or "Dolphin Head" is much more descriptive.

It is about 5200 light years away in Canis Major, and almost twice the width of the full moon.

Here it is shown in Ha and Oiii (most of the head is Oiii). The nebula is created by the star near the center of the head (not the brightest one at the edge). This is only Oiii and Ha; I also took a few Sii but there was no visible structures at that wavelength.

The image was created with R=Ha, G=(Ha*2 + Oiii)/3, B=Oiii. I worked quite a bit to de-emphasize the surrounding stars, reducing their size in the synthetic luminance (from Ha + Oiii) before the Luminance combine, but even afterwards I applied a slight gaussian blur to make the tiny stars less prominent.

The image was taken over 8 nights from 1/15/2022 thru 1/31/2022, and I thank John Murphy's Normalize Scale Gradient that I was able to salvage some of the Oiii that I took with much too much moonlight.

Imaged with N.I.N.A.
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Status	Advanced success
Started	...
Astrometry.net job	5462495
PixInsight job	ESUN1BQ0V0EBYE8P8KZ20CRLPDSOH0T1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h54m08s.28
RA (top/left)	06h50m46s.46
RA (top/right)	06h50m16s.17
RA (bottom/right)	06h57m34s.18
RA (bottom/left)	06h57m55s.39

Dec (center)	-23°28′44″.3
Dec (top/left)	-22°12′16″.7
Dec (top/right)	-24°41′15″.8
Dec (bottom/right)	-24°45′13″.4
Dec (bottom/left)	-22°16′14″.8

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Dolphin Head Nebula SH2-308

Dolphin Head Nebula SH2-308

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Dolphin Head Nebula SH2-308

Dolphin Head Nebula SH2-308

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