Abell 2 RGB versus O-III (Jerry Yesavage)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: PK122-04.1

Abell 2 RGB versus O-III

Mag 14.5 and 33" by 29" according to my figures.

The first image is just the RGB. It is photometrically calibrated in PI and the colors not manipulated, so what you see if what you get.

Jerry Macon did a beautiful image of this in HA and O-III:

https://www.astrobin.com/ra01i6/

He said the O-III was much stronger than the HA, so I skipped the HA. The second image is the O-III added to the RGB using Rob's formula to add to the G & B channels to get Teal.

I think the original RGB has more of the purple cast from the addition of the HA to the O-III signal (sorta like purple states in the recent election). But not clear how to reproduce this color using the NB filters given the different filter transmission, exposure lengths etc etc...

Original
Final
B

B

Description: O-III added to G & B channels of RGB in 72% and 88% proportions... Teal.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4012363
PixInsight job	LFY04MFP04B1L2BP95IF8WO51A4LZ0TF
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h45m34s.93
RA (top/left)	00h46m11s.50
RA (top/right)	00h44m54s.47
RA (bottom/right)	00h44m58s.40
RA (bottom/left)	00h46m14s.78

Dec (center)	+57°57′35″.7
Dec (top/left)	+58°02′53″.4
Dec (top/right)	+58°02′26″.2
Dec (bottom/right)	+57°52′15″.4
Dec (bottom/left)	+57°52′42″.5

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