LBN 105, 106 (Reg Pratt)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: HD145273 · HD145933 · HD146010 · LBN 105 · LBN 106 · Sh2-73

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LBN 105, 106

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LBN 105, 106

LBN 105 & 106 in the constellation Hercules. Another dusty cloud being illuminated by our galaxy. Interestingly enough this object is better known by its Sharpless catalog designation Sh2-73. For those who don't know, the Sharpness catalog contains only HII regions (atomic hydrogen that has been ionized). There's just one problem. This cloud doesn't contain ANY HII. Then why has it been included in the Sharpness catalog? It is thought that because the brightest parts of the cloud were detected on the Palomar-Schmidt red plates it must be an emission nebula. Later analysis of the area revealed that this was a mistake but to this date the object is still most commonly called Sh2-73.

This is a good example of why as Astrophotographers we have to be careful about jumping to conclusions when we detect a signal. Both the Ha and Sii bandpasses overlap the red filter. Oiii's bandpass overlaps both green and blue filters. So when you're imaging in narrowband remember just because you're detecting a signal doesn't mean it's the signal you're targeting. If you perform a continuum subtraction against the appropriate broadband filter and the signal disappears, it wasn't a narrowband signal but rather a continuum broadband signal.

Unique or Unusal Deep Sky Targets
ZWO ASI2600MM Pro
IOptron CEM
Fast Newtonians

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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	9909473
PixInsight job	UMHGATLLOD74XGANQQ2BQ53ZFFW3X9X9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h10m57s.626
RA (top/left)	16h08m13s.868
RA (top/right)	16h13m53s.182
RA (bottom/right)	16h13m42s.408
RA (bottom/left)	16h08m01s.139

Dec (center)	+21°47′44″.44
Dec (top/left)	+21°19′13″.54
Dec (top/right)	+21°23′17″.44
Dec (bottom/right)	+22°16′05″.87
Dec (bottom/left)	+22°12′01″.29

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LBN 105, 106

LBN 105, 106

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LBN 105, 106

LBN 105, 106

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