LBN 603 (Reg Pratt)

LBN 603

Link: https://www.r3gdigital.com/nebulae-gallery-2/lbn-603

LBN 603, a group of molecular hydrogen clouds in Cassiopeia. Within the group are LDN 1296, LDN 1295, TGU H809, and GA90 3-4.

Dark nebulae are often not much brighter than the background sky which is why they generally are not viable options unless you're under considerably dark sky. Normally I would never go for something like this from my bright city sky but I have no time for dark site trips and there are no interesting narrowband objects up right now so I figured why not challenge myself.

After a single night of moonless luminance I estimated least 100 hours of integration time would be needed if there was any hope of making a good image. I was wrong. The color data wasn't too difficult (color rarely is) but I became sky limited with luminance pretty fast. Once I passed 25 hours of L SNR was only increasing by 0.1 or less with each addition session. During the last session of L the last 12 hours only bumped me from 2.46 to 2.8 and thats when I decided it wasn't worth continuing. For comparison 8 hours of hydrogen-alpha on the Heart Nebula yielded an SNR of 8.6. So yeah, we are talking very small gains and even after 41.22 hours of L the SNR is still quite low.

All things considered the result ended up being much better than I would have thought possible. Definitely nothing to write home about. I could have made an absolute banger if I had gathered this data from my dark site. But I think its fun to test the boundaries of sky and gear. I may not have to pass up Taurus this year after all.

Equipment:
TS-Optics ONTC 10"
ZWO ASI2600mm / TS-Optics LRGB
iOptron CEM70 Mount

ES ED127
QHY268m / Astronomik LRGB
iOptron GEM45 Mount

Mag 18 (Bortle 7)

L: 41.22
R: 6.81
G: 7.44
B: 7.27
Total Integration: 62.74 hrs

Multiscope Setup
ZWO ASI2600MM Pro
The refractors!
SF Bay Area Imagers
Unique or Unusal Deep Sky Targets

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Mix of multiple sources
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Unknown

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Status	Advanced success
Started	...
Astrometry.net job	6606235
PixInsight job	N06SRJ1HWMBCTTBUTJ694VRZU8QK8PBG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h44m55s.39
RA (top/left)	00h40m58s.40
RA (top/right)	00h49m03s.30
RA (bottom/right)	00h48m57s.81
RA (bottom/left)	00h40m43s.17

Dec (center)	+52°37′27″.0
Dec (top/left)	+52°10′54″.7
Dec (top/right)	+52°13′10″.0
Dec (bottom/right)	+53°03′28″.5
Dec (bottom/left)	+53°01′08″.9

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LBN 603

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