Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022 (Geof Lewis)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 12 Cas · LBN 592 · LBN 593 · LDN 1282 · LDN 1283 · NGC 103 · Sh2-172 · Sh2-173 · The star 12Cas

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Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

Powered byPixInsight

Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

This is my first attempt at this target and my first image of 2022. Data was captured over 2 consecutive nights just after New Moon. The sky was dark, but a bit hazy and there were strong wind gusts that affected the guiding somewhat, but not too bad for the image scale. It is an HaRGB image comprising almost 5 hours Ha and just over 1 hour each RGB. Being in the Milky Way region it is a very busy star field and the Phantom is very faint. My processing involved separating stars from the background nebulosity and processing both of them separately, both to boost the nebula without blowing out the stars, but also with a little star reduction on the stars only image before recombining. I didn't want the Phanom to be so 'in your face' that it overwhelmed the image, but rather wanted to show it within the context of it's rich, colourful star field.

Original
B
Final
C

B

Title: GradX as Lighten mode

Description: GradX stripped out a lot of the background nebulosity in the original, so in this version I first duplicated the layer, then applied GradX as lighten mode to the top layer, preserving more of the nebulosity.

Uploaded: ...

C

Title: Looking up

Description: Same as vers B, but landscape orientation, so Phantom looking up instead of down

Uploaded: ...

Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	5375459
PixInsight job	SXQJYXIIV9YFOSLYGHG71NGXWM1PAD63
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h22m10s.18
RA (top/left)	00h29m56s.55
RA (top/right)	00h14m52s.40
RA (bottom/right)	00h14m42s.19
RA (bottom/left)	00h29m08s.96

Dec (center)	+61°45′01″.9
Dec (top/left)	+62°21′29″.1
Dec (top/right)	+62°26′07″.7
Dec (bottom/right)	+61°06′58″.8
Dec (bottom/left)	+61°02′33″.6

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Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

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Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

Sh2-173 (Phantom of the Opera Nebula) in Ha RGB - 5 Jan 2022

Revision title: Looking up

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Acquisition details

Description

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C

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