Contains:  NGC 772, NGC 770

Image of the day 12/24/2017

Getting plate-solving status, please wait...
    NGC772, 





    
        

            tommy_nawratil
    NGC772

    NGC772

    Technical card

    Resolution: 1075x806

    Dates:Sept. 28, 2017

    Frames: 85x180"

    Integration: 4.2 hours

    Avg. Moon age: 7.72 days

    Avg. Moon phase: 53.60%

    Astrometry.net job: 1857396

    RA center: 29.831 degrees

    DEC center: 18.997 degrees

    Pixel scale: 1.180 arcsec/pixel

    Orientation: 88.977 degrees

    Field radius: 0.220 degrees

    Locations: my lovely garden, near Vienna, Austria

    Data source: Unknown

    Description

    NGC772 in Aries takes almost 6 pages in Annals of the Deep Sky Vol.2 so there is a lot to say about it. Discovered by John Herschel in 1785 it later became Nr. 78 in Halton Arp's catalogue of peculiar galaxies. And peculiar it is. Tidal streams seem to connect to a line of neighbour galaxies, but some of the individual redshifts are very different from NGC772. The only true companion is NGC770, the spheroidal galaxy with the thicker star stream beneath. Interaction with it is also considered to be the probable cause of the disturbance so pronounced visible in NGC772.

    LRGB of 56+11+8+10 x 3min subframes, Lacerta 10" f/4 photonewton with ASI1600MMC

    Comments

    Author

    tommy_nawratil
    tommy_nawratil
    License: None (All rights reserved)
    159521
    Like

    Revisions

      NGC772, 





    
        

            tommy_nawratil
      Original
      NGC772, 





    
        

            tommy_nawratil
      B
    • Final
      NGC772, 





    
        

            tommy_nawratil
      C

    B

    annotated version

    C

    center crop

    Sky plot

    Sky plot

    Histogram

    NGC772, 





    
        

            tommy_nawratil