NGC 4725 with Ancient Tidal Stream (KuriousGeorge)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: NGC 4712 · NGC 4725

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NGC 4725 with Ancient Tidal Stream

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NGC 4725 with Ancient Tidal Stream

My first version of this galaxy pair was taken during a short 4 hour clearing with 5-min luminance subs at -20C...

First version, 3.4 hours integration

Now with skies clearing and a marine layer yielding 21.7+ SQM skies, I had a chance to revisit with longer 15-min subs at -30C. I was hoping to expose the very faint tidal stream that Mark Hanson found using a CDK24 at the Stellar Winds Observatory in Animas, New Mexico. His inverted image (inset) is LRGB at 5.75. 3.25, 3.25 and 3.5 hours respectively.

On a good quality monitor with the brightess turned up, you can see this very faint tidal stream in my slightly shorter exposure. I suspect Mark has an even darker sky with greater transparency. I'm shooting at 4,200' with 80% humidity. He's at 4,406'with likely much lower humidity.

The glow on the left side is from a very bright star that didn't quite make it into the frame.

As always, I look forward to your comments!

Original
B
Final
C

B

Description: Slight color desaturation.

Uploaded: ...

C

Description: De-noised background a bit more and removed insert.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	3386284
PixInsight job	VWCECPFVMVYRPVEIG74QCWASY6M55JHF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h50m22s.852
RA (top/left)	12h51m29s.574
RA (top/right)	12h49m17s.459
RA (bottom/right)	12h49m16s.348
RA (bottom/left)	12h51m28s.730

Dec (center)	+25°29′17″.74
Dec (top/left)	+25°39′45″.24
Dec (top/right)	+25°40′09″.35
Dec (bottom/right)	+25°18′48″.62
Dec (bottom/left)	+25°18′23″.77

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NGC 4725 with Ancient Tidal Stream

NGC 4725 with Ancient Tidal Stream

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NGC 4725 with Ancient Tidal Stream

NGC 4725 with Ancient Tidal Stream

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