Iris Nebula (NGC 7223, Caldwell 4) (Ryan)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD200775 · Iris Nebula · LBN 487 · LDN 1170 · LDN 1172 · LDN 1174 · NGC 7023

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Iris Nebula (NGC 7223, Caldwell 4)

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Iris Nebula (NGC 7223, Caldwell 4)

This is the Iris Nebula, aka NGC 7023 shot from my backyard in Pasadena, CA. It is about 1300 light years from earth and is located near the constellation Cepheus towards the north. This target is circumpolar which means that it never sets below the horizon.

NGC 7023 is what is known as a reflection nebula which means that the dust cloud itself is not emitting light, rather it is reflecting (or absorbing) light from the stars within. The dust particles are extremely fine and are smaller than dust particles on Earth. This is an extremely challenging target to get to look good because much of it is completely dark, so getting enough signal to noise in the dust to show gradients is extremely hard.

This target is especially challenging shooting from my Bortle 8/9 backyard. The best images I have seen of this are done from dark sites with observatory class telescopes with extremely long integration times (like 70h). I have about 20 hours of data and even though I don’t have equal time on each filter, I decided to give it up because I thought I would have diminishing returns. It really is a beautiful target so maybe one day I’ll revisit it and perhaps try with a wider field and a darker site.

As mentioned before, I did not have even number of subs for each filter, partly because there was some clouds but I also just did not pay much attention night by night.

Subframe count (all 60s at -10C, 1x1 binned at 121 gain)
- 430G, 169B, 96R, 663L

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Status	Advanced success
Started	...
Astrometry.net job	5025795
PixInsight job	4UNVXR8W0XXC9DOOWVW67BECA5I40G0J
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m39s.959
RA (top/left)	21h00m35s.673
RA (top/right)	20h55m42s.810
RA (bottom/right)	21h02m40s.687
RA (bottom/left)	21h07m47s.610

Dec (center)	+68°08′52″.70
Dec (top/left)	+68°47′44″.53
Dec (top/right)	+67°48′13″.55
Dec (bottom/right)	+67°29′56″.59
Dec (bottom/left)	+68°28′40″.10

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Iris Nebula (NGC 7223, Caldwell 4)

Iris Nebula (NGC 7223, Caldwell 4)

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Iris Nebula (NGC 7223, Caldwell 4)

Iris Nebula (NGC 7223, Caldwell 4)

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