Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  NGC 4627  ·  NGC 4631  ·  NGC 4656  ·  NGC 4657  ·  Whale Galaxy
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The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631), 



    
        

            Drew Evans
The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631)
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The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631)

Getting plate-solving status, please wait...
The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631), 



    
        

            Drew Evans
The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631)
Powered byPixInsight

The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631)

Technical card

Imaging telescopes or lenses: Explore Scientific ED 152CF

Imaging cameras: ZWO ASI 2600MM Pro

Mounts: Celestron CGX-L

Guiding cameras: ZWO ASI174 Mini

Software: PixInsight  ·  AstroPixel Processor  ·  Lightroom CC

Filters: Astronomik RGB Deep Sky 2"  ·  Astronomik Ha 2" 12nm  ·  Astronomik L3 2"

Accessory: ZWO AsiAir Pro  ·  ZWO EFW 2" 7 Position  ·  ZWO OAG M68  ·  ZWO EAF Electronic Auto Focuser


Dates:May 14, 2021

Frames: 168x600" (28h)

Integration: 28h

Avg. Moon age: 2.42 days

Avg. Moon phase: 6.49%


Basic astrometry details

Astrometry.net job: 4609477

RA center: 12h 42' 56"

DEC center: +32° 24' 21"

Pixel scale: 0.640 arcsec/pixel

Orientation: 5.626 degrees

Field radius: 0.632 degrees


Resolution: 3912x5942

Locations: Home, Flagstaff, Arizona, United States

Data source: Backyard

Description

Here is the beautiful pair of the Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631) in the constellation Canes Venatici. There are dozens of other more distant galaxies in the background that were too faint to plate solve.

The smaller “Hockey Stick Galaxy” on the left is mainly blue because of the large amount of young blue stars. Typically, abundance of star birth activity indicates some violent event, which triggered the condensation of gas clouds into proto-stars, which lead to occurrence of many new young stars. Such event is very often merger of two galaxies and the slightly irregular shape of NGC4656 and also streams of stars reaching far from the galaxy spiral arms hint such merger occurred only recently.

The larger Whale Galaxy at right is probably rather typical spiral galaxy, but visible from the side. It shows a yellow and orange central bulge, composed mainly of old stars, as well as dark interstellar dust lanes and dark reddish hydrogen clouds around the galaxy disk. Light blue portions indicate presence of many bright, young blue stars consuming the outer arms.

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The Hockey Stick (NGC 4656) and Whale Galaxy (NGC 4631), 



    
        

            Drew Evans