Hemisphere:  Southern  ·  Constellation: Reticulum (Ret)  ·  Contains:  NGC 1313  ·  NGC1313

Image of the day 11/25/2018

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    Topsy Turvy galaxy through IFN, 


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    Topsy Turvy galaxy through IFN

    Imaging telescopes or lenses: Plane Wave Instruments CDK 12.5"

    Imaging cameras: Finger Lakes Instruments Proline 16803

    Mounts: AP900GTO

    Guiding telescopes or lenses: Plane Wave Instruments CDK 12.5"

    Guiding cameras: Starlight Xpress Lodestar guide camera

    Software: PixInsight  ·  MaximDL

    Filters: Astronomik L R G B H alpha Series II

    Dates:Nov. 8, 2018Nov. 9, 2018Nov. 10, 2018

    Frames:Astronomik L R G B H alpha Series II: 72x600" bin 1x1

    Integration: 12.0 hours

    Avg. Moon age: 1.81 days

    Avg. Moon phase: 4.29%

    Astrometry.net job: 2381283

    RA center: 3h 18' 57"

    DEC center: -66° 34' 26"

    Pixel scale: 0.729 arcsec/pixel

    Orientation: -91.254 degrees

    Field radius: 0.574 degrees

    Resolution: 3971x4033

    Locations: Wiruna Dark Sky Site, Ilford, NSW, Australia

    Data source: Traveller


    NGC 1313 (also known as the Topsy Turvy Galaxy) is an isolated barred spiral galaxy discovered by James Dunlop in 1826. It has a diameter of about 50,000 light-years, or about half the size of the Milky Way. It has a strikingly uneven shape and its axis of rotation is not exactly in its centre. There is also strong starburst activity and associated supershells. The galaxy is dominated by scattered patches of intense star formation, which gives it a rather ragged appearance. The uneven shape, the ragged appearance and the strong starburst can all be explained by a galactic collision in the past. However, NGC 1313 is an isolated galaxy with no direct neighbours, so the source of the disturbance is unclear. Possibly it has swallowed a small companion in the past.

    There is also integrated flux nebulosity (IFN) throughout the field. This is an extremely faint glow caused by the combined light of the stars of the Milky Way reflected and re-emitted by interstellar gas and dust. It’s most easily seen in images far from the plane of the Milky Way.


    Sky plot

    Sky plot


    Topsy Turvy galaxy through IFN,