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Contains:  NGC 4747, NGC 4725, NGC 4712

Image of the day 04/23/2017

Getting plate-solving status, please wait...
    NGC4725 and neighbours, 





    
        

            tommy_nawratil
    NGC4725 and neighbours

    NGC4725 and neighbours

    Technical card

    Resolution: 4605x3485

    Dates:March 30, 2017

    Frames: 253x180"

    Integration: 12.7 hours

    Avg. Moon age: 2.67 days

    Avg. Moon phase: 7.86%

    Astrometry.net job: 1542271

    RA center: 192.743 degrees

    DEC center: 25.574 degrees

    Pixel scale: 0.783 arcsec/pixel

    Orientation: -178.600 degrees

    Field radius: 0.628 degrees

    Locations: my lovely garden, near Vienna, Austria

    Description

    Combining the 3,8µm pixels of ASI1600MMC with my Lacerta Photonewton's 1000mm focal length resultes in a pixel scale of 0,78arcsec/pixel - a healthy oversampling if seeing has mercy. The 16MP chip covers around 40arcmin on the sky, and even tiny NGC4712 (2arcmin long, and smaller axis only the size of Jupiter!) is resolved into wealth of detail. NGC4725 is 11x7arcmin, and the galaxy with the huge tideal streamers is NGC4747 or No.159 in the catalog of Halton Arp.

    I have added 100% crops of NGC4725 and 4747, check out for details!

    ASI1600MMC here works at unity gain, a LRGB of 143x46x32x32 subs of 180sec each.

    I did a search in Aladin/VizieR on a small area north of 4725 - the faintest stars are about 23mag

    http://aladin.u-strasbg.fr/java/nph-aladin.pl?from=VizieR&script=get%20Aladin%2012%2050%2040.523%20%2B25%2038%2047.84%2010arcmin%3Bsync%3Bget%20VizieR%28V/139%29

    Comments

    Author

    tommy_nawratil
    tommy_nawratil
    License: None (All rights reserved)
    227125
    Like

    Revisions

    • Final
      NGC4725 and neighbours, 





    
        

            tommy_nawratil
      Original
      NGC4725 and neighbours, 





    
        

            tommy_nawratil
      B
      NGC4725 and neighbours, 





    
        

            tommy_nawratil
      C
      NGC4725 and neighbours, 





    
        

            tommy_nawratil
      D

    B

    NGC4725 and NGC4712 crop

    C

    NGC4747 crop

    D

    annotated version

    Sky plot

    Sky plot

    Histogram

    NGC4725 and neighbours, 





    
        

            tommy_nawratil