Hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  NGC 4712  ·  NGC 4725
Getting plate-solving status, please wait...
NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge
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NGC 4725 with Ancient Tidal Stream

Getting plate-solving status, please wait...
NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge
Powered byPixInsight

NGC 4725 with Ancient Tidal Stream

Imaging Telescopes Or Lenses
Planewave CDK24
Imaging Cameras
FLI Proline 16803
Mounts
Planewave L600
Filters
Astrodon 50mm B · Astrodon 50mm R · Astrodon 50mm L · Astrodon 50 mm G
Accessories
FLI CFW-5-7 · Astrodon Monster MOAG · Hedrick Focuser · Planewave Delta-T · Planewave EFA · None
Software
Planewave PWI3 · Planewave PWI4 · PixInsight 1.8 · Sequence Generator Pro · Photoshop CS3 · PHD Guiding 2 · CCDWare CCD Inspector · Maxim DL6 · Neat Image V7
Guiding Cameras
Starlight Xpress Ultrastar

Acquisition details

Dates:
June 1, 2019 ·  June 2, 2019 ·  June 3, 2019 ·  June 4, 2019
Frames:
Astrodon 50 mm G: 4x900" (1h) -30C bin 1x1
Astrodon 50mm B: 12x900" (3h) -30C bin 1x1
Astrodon 50mm L: 18x900" (4h 30') -30C bin 1x1
Astrodon 50mm R: 10x900" (2h 30') -30C bin 1x1
Integration:
11h
Darks:
20
Flats:
80
Flat darks:
80
Bias:
20
Avg. Moon age:
14.33 days
Avg. Moon phase:
1.72%
Bortle Dark-Sky Scale:
1.00
Mean SQM:
21.70

RA center: 12h50m22s.852

DEC center: +25°2917.74

Pixel scale: 0.468 arcsec/pixel

Orientation: 0.791 degrees

Field radius: 0.306 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 3819x2740

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard

Description

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!

Comments

Revisions

    NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge
    Original
    NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge
    B
  • Final
    NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge
    C

B

Description: Slight color desaturation.

Uploaded: ...

C

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

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 4725 with Ancient Tidal Stream, 



    
        

            KuriousGeorge