Gum 85 (Torben van Hees)

Celestial hemisphere: Southern · Constellation: Serpens (Ser) · Contains: HD167809 · HD168074 · LBN 72 · Sh2-54

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Gum 85

Link: http://astro.van-hees.name

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Gum 85

Link: http://astro.van-hees.name

Gum 85 is the brightest region within SH2-54, which itself is part of the large HII complex that also forms the Eagle and Omega nebula. SH2-54 is the are where star formation started first in this molecular complex. The probable cause is that it started to interact with an old "super bubble" - a cavity filled with hot gas atoms caused by supernovas. Star formation began about 4 million years ago.

This is about as much south as I can reasonably reach into the Summer Milky Way. The target only rises to 28°. I've tried myself on a bit of tone-mapping here, this is only H-alpha + RGB stars. I have more h-alpha data in this region from the Epsilon, but adding it to this image brought no gain, to my surprise. It only made the star shapes a bit worse. I have added it as Revision B to also show the surroundings of Gum 85.

Final
Original
B

B

Title: SH2-54 in H-alpha

Description: The surroundings of Gum 85

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5933577
PixInsight job	X2DC2UV71N7MM6WIM2C5M1V5M3D0TVU4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h17m51s.136
RA (top/left)	18h18m23s.496
RA (top/right)	18h19m21s.879
RA (bottom/right)	18h17m19s.100
RA (bottom/left)	18h16m20s.405

Dec (center)	-11°41′10″.94
Dec (top/left)	-12°08′42″.89
Dec (top/right)	-11°23′03″.11
Dec (bottom/right)	-11°13′35″.91
Dec (bottom/left)	-11°59′12″.33

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