CG4 (Stars Redux) (Ben)

Celestial hemisphere: Southern · Constellation: Puppis (Pup) · Contains: PGC 21338

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CG4 (Stars Redux)

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CG4 (Stars Redux)

Cometary Globule 4, and background galaxy PCG21338 (or PCG21375?) in the constellation of Puppis, imaged back in January 2020 but only re-processed now to a moderately higher level of satisfaction.

Images taken with Chilescope T1 over 3 nights:
-> 5 x 600" + 1 x 1200" in L
-> 3 x 600" + 1 x 1200" in H-alpha
-> 2 x 1200" in R
-> 4 x 600" + 2 x 1200" in B
I misjudged my planning as I'm used to their Newtonians at F3.6, and not to this RC at F8.

Using this telescope means challenges ... not only some of the calibration files do not remove problems (eg. big dark spot on the bottom centre), but you also have to deal with "warm pixels" near the central black column (resulting in bright-ish column in the middle of the frame) and weird small round artificats in H-alpha and a bit in red ...
I do not have the expertise (nor patience) to deal with these problems beyond a fairly "standard" approach, therefore they stay in.

Processing and editing done with PixInsight 1.8.8 with new workflow to make use of the BlurX, NoiseX and StarX plugins.

For the little story, I personally imagine CG4 to be a Sandworm /Shai-Hulud from Dune, while my girlfriend imagines a cat seen from underneath, "jumping" at the galaxy with its head the equivalent of the sandworm's mouth.
Different perspectives, hey ... :-P

Original
C

C

Title: Starless

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7642497
PixInsight job	Q49RIFD24PE3EYL6ZH6ZVMYK2N5GPWQG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h34m30s.599
RA (top/left)	07h34m12s.217
RA (top/right)	07h35m35s.680
RA (bottom/right)	07h34m49s.107
RA (bottom/left)	07h33m25s.417

Dec (center)	-46°58′44″.64
Dec (top/left)	-46°47′37″.77
Dec (top/right)	-46°55′34″.63
Dec (bottom/right)	-47°09′50″.69
Dec (bottom/left)	-47°01′51″.100

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