SH2-254- SH2-255-SH2-256-SH2-257-SH2-258 Mushroom Nebula HOO (Brian Diaz)

Celestial hemisphere: Northern · Constellation: Orion (Ori) · Contains: HD253109 · HD253188 · HD253220 · HD253247 · HD253277 · HD253278 · HD253327 · HD253391 · HD253444 · HD253445 · HD253467 · HD253530 · HD253531 · HD253577 · HD42434 · HD42531 · HD42559 · IC 2162 · LBN 858 · LBN 859 · Sh2-254 · Sh2-255 · Sh2-256 · Sh2-257 · Sh2-258

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SH2-254- SH2-255-SH2-256-SH2-257-SH2-258 Mushroom Nebula HOO

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SH2-254- SH2-255-SH2-256-SH2-257-SH2-258 Mushroom Nebula HOO

The nebula complex lies on the border between constellations Orion and Gemini and is a part of the GEM OB1 molecular cloud. Further details can found below the image.

The three larger nebulae are (from right to left) SH2-254, SH2-257 and SH2-255. The smaller nebula below SH2-254 and SH2-257 is SH2-256. SH2-258 is the small reflection nebula on the left side which appears magenta (due to the color factors). The distance of the ionizing sources of the emission nebulae can be queried from the Gaia DR3 database:

NebulaSourceDistance in light yearsSH2-254HD 2532476500 ly (± 300 ly)SH2-255LS 196700 ly (± 400 ly)SH2-2562MASS J06123651+17565486150 ly (± 200 ly)SH2-257HD 2533275150 ly (+5000/-2000 ly)

The Sh 2-254 to Sh 2-258 HII regions are embedded in a molecular cloud with 27 thousand solar masses of gas and dust. The dense central core of the cloud, which includes the young massive cluster S255-2, is located between the two bright nebulae Sh 2-255 and Sh 2-257. This star formation complex, catalogued by Avedisova as 192.60-0.05, contains 6 ionising stars, a massive proto stellar cluster (Sh 2-255N), three infrared clusters and 11 masers.

Sh 2-254 is the large faint nebula at the right of this image.

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Status	Advanced success
Started	...
Astrometry.net job	9792092
PixInsight job	KDXZ73UAXSDXHRBXTH76R8QPD1XL808I
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h12m45s.380
RA (top/left)	06h14m16s.327
RA (top/right)	06h11m07s.949
RA (bottom/right)	06h11m14s.470
RA (bottom/left)	06h14m21s.861

Dec (center)	+17°59′18″.60
Dec (top/left)	+18°17′40″.31
Dec (top/right)	+18°15′55″.60
Dec (bottom/right)	+17°40′56″.16
Dec (bottom/left)	+17°42′36″.10

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SH2-254- SH2-255-SH2-256-SH2-257-SH2-258 Mushroom Nebula HOO

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