Sh2-73 Behind IFN in Hercules (Scott Stirling)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: 10 Her · 16 Her · 20 Her) · 20 gam Her · 44 Ser · 44 pi. Ser · IC 1156 · IC 1176 · IC 1177 · IC 1189 · IC 1191 · IC 4588 · NGC 6027 · NGC 6028 · NGC 6030 · NGC 6032 · NGC 6035 · NGC 6051 · NGC 6052 · NGC 6055 · NGC 6056 · NGC 6057 · NGC 6060 · NGC 6061 · NGC 6062 · NGC 6075 · NGC 6098 · NGC 6099 · Sh2-73 · The star 10 Her · And 3 more.

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Sh2-73 Behind IFN in Hercules

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Sh2-73 Behind IFN in Hercules

Sh2-73 aka LBN 105 aka MBM 40 molecular cloud / integrated flux nebula in Hercules, allegedly miscategorized as emission nebula in Sharpless2 catalog. Yet, there is red Ha nebulosity visible through the IFN clouds at the location known as Sh2-73. It is not miscategorized, but obscured by IFN in front of it, it seems. I did not mask the area of Sh2-73 to enhance the Ha at all, nor is there any Ha filter data added to this image.

Another interesting feature visible in this field of view is a very large rectangular formation of the IFN clouds near Sh2-73, as if an invisible rectangular object is there with the IFN flowing around its edges.

This image combines three seasons of imaging data of this object, from Q2 2017, Q2 2018 and Q2 2019.

All the subframes are 300 seconds. LRGB. Drizzled.

L = 118 x 300s = 9.8 hrs
R = 76 x 300s = 6.3 hrs
G = 95 x 300s = 7.9 hrs
B = 73 x 300s = 6.1 hrs
-------------------------------------
30.1 hours total

Original
Final
G

AstroBin Platform open discussions community forum

catalog: Sharpless-2
Deep Sky West: Rokinon 135mm & QSI 583wsg

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Status	Advanced success
Started	...
Astrometry.net job	9275166
PixInsight job	UGQLW0JBZZ9OG25G8BBS23RUYW9B6GN3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h10m33s.79
RA (top/left)	16h23m25s.89
RA (top/right)	15h58m04s.20
RA (bottom/right)	15h58m23s.76
RA (bottom/left)	16h22m23s.25

Dec (center)	+21°53′01″.3
Dec (top/left)	+25°46′34″.4
Dec (top/right)	+25°50′15″.5
Dec (bottom/right)	+17°56′06″.3
Dec (bottom/left)	+17°52′24″.3

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Sh2-73 Behind IFN in Hercules

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