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Contains:  NGC 55

Image of the day 10/15/2017

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    NGC 55 - Irregular Galaxy, 


            Terry Robison
    NGC 55 - Irregular Galaxy

    Technical card

    Imaging telescope or lens:RC 10" Ritchey-Chrétien

    Imaging camera:SBIG STL-11000M

    Mount:AP900GTO Astro Physics

    Guiding telescope or lens:RC 10" Ritchey-Chrétien

    Guiding camera:SBIG STL-11000M

    Resolution: 2683x1788

    Dates:Oct. 2, 2017

    Frames: 63x900"

    Integration: 15.8 hours

    Avg. Moon age: 11.42 days

    Avg. Moon phase: 87.84% job: 1765906

    RA center: 3.774 degrees

    DEC center: -39.222 degrees

    Pixel scale: 0.804 arcsec/pixel

    Orientation: 311.125 degrees

    Field radius: 0.360 degrees


    NGC 55 is a member of the nearby Sculptor group of galaxies. This group has approximately 30 galaxies within. Some well-known members include the spiral galaxies of NGC 253 and NGC 300. NGC 55 is the closest edge-on galaxy that is just 7.5 million light years away. The galaxy is about 70,000 light years across. That makes it a little smaller than our own Milky Way.

    The structure of the disk reveals an asymmetric extra-planar morphology, and the structure of the disc structure suggests remnants of merger events in the past. Star formation can be seen throughout the disk. In the image presented, I incorporated Ha data into the image to highlight these areas with red. There are also large quantities of gas off the disc plane that are still forming stars. The galaxy has a bright core, and many young blue star clusters dispersed throughout the galaxy. Personally, these features give it a three dimensional look, not just flat.



    Terry Robison
    License: None (All rights reserved)

    Sky plot

    Sky plot


    NGC 55 - Irregular Galaxy, 


            Terry Robison