LDN 673 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Aquila (Aql) · Contains: PK046-01.1

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LDN 673

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LDN 673

This object is a beautiful dark nebula located only 600 light years away in the constellation of Aquila. The object is the 673rd object in Lynds Catalogue of Dark Nebulae.

Most dark nebula have a fairly simple structure, but not this one. I love that this object is actually comprised of 12 or so individual arcing smaller objects seemingly placed at random. The best way to describe it to me is that it looks like a Rorschach test. The molecular clouds in the local Aquila rift make the background stars look reddish, except towards the top of the image where blue is reflected by several bright blue stars.

Within the dark nebula are three small but fascinating objects. The first is Herbig-Haro object HH32 in the upper right. HH 32 is an older HH object and the central star (AS 353A) has already blown out most of the formation dust, so that the star is clearly visible. The shock waves from the bipolar jets are barely visible. The second interesting object is the orange tinted nebula RNO 109 at upper center. RNO stands for 'Red Nebulous Object', a catalog of 150 such objects published by Martin Cohen in 1980. Dr. Cohen is a British astronomer at the University of California, Berkeley and NASA Ames Research Center. The third interesting object is GD 218 - a white dwarf. It is the tiny bright blue dot roughly midway between the previous two objects.

ZWO ASI1600MM/QHY163M
The refractors!
Cloudy Nights

Dark Nebulae
LDN Catalog
Orphaned Beauties Catalog (Complete)

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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	2231451
PixInsight job	3WBUN5PMHU4UZSR05AC9WBFEY0VGI4Y1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h21m22s.577
RA (top/left)	19h20m03s.896
RA (top/right)	19h19m50s.445
RA (bottom/right)	19h22m41s.490
RA (bottom/left)	19h22m55s.140

Dec (center)	+11°16′25″.24
Dec (top/left)	+11°46′17″.87
Dec (top/right)	+10°48′59″.34
Dec (bottom/right)	+10°46′31″.83
Dec (bottom/left)	+11°43′49″.86

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LDN 673

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