IC4604, part of the Rho Ophiuchi cloud complex (Frank Alvaro)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: 5 Oph · 5 rho Oph · B42 · HD147384 · HD147432 · HD147681 · HD147742 · HD147888 · HD147889 · HD147932 · HD148352 · IC 4603 · IC 4604 · LBN 1109 · LBN 1111 · LBN 1112 · LDN 1681 · LDN 1686 · LDN 1687 · LDN 1688 · LDN 1690 · LDN 1692 · LDN 1696 · The star ρ Oph · rho Oph Nebula

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IC4604, part of the Rho Ophiuchi cloud complex

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IC4604, part of the Rho Ophiuchi cloud complex

Rho Ophiuchi nebula. 231x 180sec exposures (11.5 hrs) over three nights recently.
Well, this was a fight to the death and I think RO won. A very complex image to process in Pixinsight and I have no idea if it's good or not.

Several things:
- the large amount of nebulosity made background extraction very difficult, and I can't tell if there's a cast on the RHS or if that's just more interstellar dust.

- What appears to be amp glow at the bottom left probably isn't. I've used the appropriate calibration frames - dark, flat and dark flat - and the fact that images on another DSO target on the same night do not show this glow indicates it may be interference from a bright star that's just out of the frame.

- And I had absolutely no idea how %^$#! big this DSO is! This image is only a fraction of the whole complex, and Telescopious tells me I'd need a 16 frame mosaic to get it all in. Challenge accepted.

Australian Astrophotographers
Southern Hemisphere Astro

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Status	Advanced success
Started	...
Astrometry.net job	5810724
PixInsight job	S7LANPFPDGA7F6FQTQ49X5115Z3FX852
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h25m35s.40
RA (top/left)	16h28m40s.44
RA (top/right)	16h29m20s.30
RA (bottom/right)	16h22m32s.89
RA (bottom/left)	16h21m46s.80

Dec (center)	-23°44′44″.6
Dec (top/left)	-24°58′31″.4
Dec (top/right)	-22°37′08″.6
Dec (bottom/right)	-22°30′39″.1
Dec (bottom/left)	-24°51′53″.7

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IC4604, part of the Rho Ophiuchi cloud complex

IC4604, part of the Rho Ophiuchi cloud complex

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IC4604, part of the Rho Ophiuchi cloud complex

IC4604, part of the Rho Ophiuchi cloud complex

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