LBN 105 (AKA Sh2-73) (George Simon)

Celestial hemisphere: Northern · Constellation: Hercules (Her)

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LBN 105 (AKA Sh2-73)

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LBN 105 (AKA Sh2-73)

Almost every published image of LBN 105 that I examined in preparation for publishing my own image includes a commentary relating the same facts about this object. However, since LBN 105 is rather infrequently imaged, many of you might not be aware of these facts. So, at the risk of being repetitive, I, too, am going to relate the same basic facts.

LBN 105 was originally characterized as an emission nebula. Accordingly, Stewart Sharpless included it as the 73rd entry in the second edition of his catalogue of HII regions. More recently, it has been discovered that LBN 105 is not an HII region, but is, in fact, a molecular cloud, with no signs of star formation occurring within it. Located at a distance of about 400 light years from Earth, and at a galactic latitude of about 45º, LBN 105 sits considerably above the Milky Way's disk and reflects the integrated light of the entire galaxy. LBN 105 is thus a classic instance of IFN. Its peculiar hairpin shape is apparently pretty typical of the shape of local molecular clouds.

As one might imagine, given the dimness that characterizes most instances of IFN, this image was a monumental pain to process. I could have made things easier on myself by collecting at least twice as much data, but we are entering the season here in South Carolina when clear nights are hard to come by, due to lingering cloud debris from afternoon and evening pop-up thunderstorms. So, I went with what I had and battled with the noise attending upon the hard stretch of the data that I had to do to reveal LBN 105 and at least some of the dimmer nebulosity in which it is embedded.

Cloudy Nights

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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	Basic success
Started	...
Astrometry.net job	9800394
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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LBN 105 (AKA Sh2-73)

LBN 105 (AKA Sh2-73)

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LBN 105 (AKA Sh2-73)

LBN 105 (AKA Sh2-73)

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