Abell 28 Pn in Ursa Major Ha HaRGB. Surface Mag 19 and change. (Pat Rodgers)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: PK158+37.1

Abell 28 Pn in Ursa Major Ha HaRGB. Surface Mag 19 and change.

Saw a lovely image of this by Jerry Macron, which reminded me to get on with my Abell list (27 so far I think in 4 years!) this is probably the faintest Pn I've imaged and I have done some faint objects.

Image A: Is a single calibrated 10 minute sub taken at F4, with a STF applied in PI. Nothing there. No moon and it's high in the sky with great seeing due to the rare low humidity.

B

Description: The near 7 hour stack of 600sx40 Ha

Uploaded: ...

C

Description: The HaRGB not over stretched as it's very noisy, I wiil get more colour data when clouds allow.

Uploaded: ...

D

Description: The HaRGB image with the Ha added as a Luminance. Still very noisy. Needs a lot more Ha to clean it up.

Uploaded: ...

E

Description: Ha is up to 12 hours now but still a noisy image.

Uploaded: ...

F

Description: The 12 hours Ha with a permanent STF stretch.

Uploaded: ...

G

Description: Re did the application of the Ha into the RGB with a really blurred mask and several iterations to build up the Ha.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4442369
PixInsight job	8T4921KDN1OBYVKKYJF7096PFDLIFYR8
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	08h41m34s.78
RA (top/left)	08h41m00s.63
RA (top/right)	08h40m23s.89
RA (bottom/right)	08h42m08s.36
RA (bottom/left)	08h42m46s.18

Dec (center)	+58°13′26″.5
Dec (top/left)	+58°24′44″.7
Dec (top/right)	+58°05′39″.8
Dec (bottom/right)	+58°02′08″.3
Dec (bottom/left)	+58°21′11″.3

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Abell 28 Pn in Ursa Major Ha HaRGB. Surface Mag 19 and change.

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Abell 28 Pn in Ursa Major Ha HaRGB. Surface Mag 19 and change.

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