IC 4685 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B302 · B303 · B91 · IC 1274 · IC 1275 · IC 4685 · LBN 28 · LBN 29 · LDN 210 · LDN 211 · LDN 213 · LDN 214 · LDN 227 · NGC 6559 · PK006-02.1 · Sh2-29

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IC 4685

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IC 4685

This object is an emission/reflection/dark nebula complex located about 4,000 light years away in the constellation of Sagittarius at a declination of -24 degrees. I usually image with north up, but for this image north is right. This framing is the only way to capture all of these interesting objects with this setup.

This object is located in the southern sky just 1 degree east of the Lagoon Nebula (M8). In fact, it may be an eastern extension of it.

The more I study the image, the more I see - the dense colorful star background shining through this dusty region of space, the bright bulbous reddish circular Ha areas, the interesting bluish reflection nebulae, the dark dust river running through the center of the image, the bright ionization front at upper left, and the small planetary nebula (M 1-41 / PK 6-2.1) at far left.

Despite different definitions in programs like SIMBAD, I believe that Sh2-29 refers to the entire center/left of the image. Sh2-31 is the circular HII region at upper right, and Sh2-32 is the circular HII region at far right.

Sharpless2 Objects
Unique or Unusal Deep Sky Targets
ASI 6200 MM Pro
Cloudy Nights
Schmidt-Cassegrain Telescope (SCT) Imagers
Texas Astronomy
Images from the EdgeHD Series

Gum Catalog (47/85)
HII-Dominated Nebulae

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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.

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.
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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	9101604
PixInsight job	V36SXDJJ38C3R5D7CVME0E3N3W7GH1F6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h09m32s.578
RA (top/left)	18h10m28s.113
RA (top/right)	18h08m23s.988
RA (bottom/right)	18h08m36s.732
RA (bottom/left)	18h10m41s.501

Dec (center)	-23°54′17″.56
Dec (top/left)	-23°31′49″.79
Dec (top/right)	-23°33′51″.39
Dec (bottom/right)	-24°16′44″.58
Dec (bottom/left)	-24°14′45″.32

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