Hemisphere:  Northern  ·  Constellation: Virgo (Vir)  ·  Contains:  M 49  ·  NGC 4470  ·  NGC 4472  ·  NGC 4488  ·  NGC 4492  ·  NGC 4518  ·  NGC 4526  ·  NGC 4535
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Eastern Portion of the Virgo B Subcluster, 



    
        

            George Simon
Eastern Portion of the Virgo B Subcluster
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Eastern Portion of the Virgo B Subcluster

Getting plate-solving status, please wait...
Eastern Portion of the Virgo B Subcluster, 



    
        

            George Simon
Eastern Portion of the Virgo B Subcluster
Powered byPixInsight

Eastern Portion of the Virgo B Subcluster

Technical card

Imaging telescopes or lenses: TPO/GSO 6" f/6 Imaging Newtonian

Imaging cameras: Nikon D5300

Mounts: Sky-Watcher NEQ6

Guiding telescopes or lenses: ORION Mini guide 50mm

Guiding cameras: ORION SSAG

Software: PHD2.6.9dev4  ·  DeepSkyStacker 4.2.5  ·  StarTools 1.7.459  ·  EQMOD  ·  C2A 2.1  ·  BackyardNikon2.0.11  ·  GIMP2.10.18

Accessory: Baader MPCC


Dates:April 4, 2021

Frames: 48x300" ISO200

Integration: 4.0 hours

Darks: ~16

Flats: ~50

Bias: ~25

Avg. Moon age: 22.23 days

Avg. Moon phase: 49.13%

Bortle Dark-Sky Scale: 5.00

Temperature: 12.00


Basic astrometry details

Astrometry.net job: 4391481

RA center: 12h 31' 54"

DEC center: +8° 5' 9"

Pixel scale: 1.747 arcsec/pixel

Orientation: 357.261 degrees

Field radius: 0.863 degrees


Resolution: 2958x1974

Data source: Backyard

Description

Displayed in this image is the eastern portion of the Virgo B subcluster of galaxies, which is more or less centered on M49, the giant elliptical galaxy on the right side of the image. Virgo B is part of the larger Virgo Cluster, which is itself part of the Virgo Supercluster, which includes our Local Group of galaxies.

M49 is the most luminous member of the Virgo Cluster. It contains a supermassive black hole estimated at 565 million solar masses. M49 has an estimated 5,900 globular clusters, averaging about 10 billion years old. (The Milky Way, by comparison, has about 200 globular clusters.) Interacting with M49 is the dwarf irregular galaxy UGC 7636 (the small blue "blob" to the lower left of M49). Studies suggest that the interaction between these two galaxies has triggered strong star formation in UGC 7636, and has caused a tidal stream of stars stretching from the dwarf galaxy toward M49. This feature is dimly perceptible in my image.

The barred spiral galaxy prominently visible in the upper left-hand portion of the image is NGC 4535. In the 1950s, amateur astronomer Leland S. Copeland dubbed this galaxy "The Lost Galaxy," reportedly due to its hazy, indistinct appearance when observed visually. "Hazy" and "indistinct" describe about 95% of the galaxies I have observed visually, so I would love to know what distinguished this galaxy for Copeland.

The large lenticular galaxy in the lower lower left-hand portion of the image is NGC 4526. This galaxy appears to be abnormally poor in dark matter, and has a central black hole of about 450 million solar masses.

All of the galaxies of the Virgo B subcluster lie about 55 million light years from the Solar System.

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  • Eastern Portion of the Virgo B Subcluster, 



    
        

            George Simon
    Original
  • Final
    Eastern Portion of the Virgo B Subcluster, 



    
        

            George Simon
    B

B

Description: I removed some residual gradient from the right side of the image.

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Eastern Portion of the Virgo B Subcluster, 



    
        

            George Simon