Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud (Dave Erickson)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: 20 sig Sco · Alniyat · M 4 · NGC 6121 · Scorpius · Sh2-9 · The star Al Niyat (σSco)

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Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

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Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

Sh2-9 is a hydrogen Alpha cloud that has immersed in it a B class star. With its immersion in Halpha and this processing the B type star Alnyiat is reddened. This ensemble with M4 makes for a striking and moderately difficult object to image.

There is a deep molecular cloud to the north, left, partially enveloping the Sh2-9 hydrogen emission. There are dim structures in this molecular cloud appearing as darker riffs.

M4 is surrounded dimly by the Halpha nebula and a bit by a molecular cloud that is illuminated by Antares.

This was imaged over several nights using a 6" F/6.45 Melior APO, Astrodon filters RGB and 5nm Ha.

North is to the left...

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Status	Advanced success
Started	...
Astrometry.net job	4579696
PixInsight job	7S6V0JMSM8HDKEE8QEZAC654L48ZYZ7P
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h21m39s.89
RA (top/left)	16h18m08s.50
RA (top/right)	16h19m26s.17
RA (bottom/right)	16h25m14s.26
RA (bottom/left)	16h23m51s.18

Dec (center)	-25°50′31″.7
Dec (top/left)	-24°57′49″.8
Dec (top/right)	-26°55′01″.9
Dec (bottom/right)	-26°42′55″.9
Dec (bottom/left)	-24°45′56″.3

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Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

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Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

Sh2-9 and M4 Processed to Highlight the Hydrogen Cloud

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