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Contains:  NGC 289

Image of the day 12/01/2019

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    NGC 289 - 70 million light-years away, 





    
        

            Terry Robison
    NGC 289 - 70 million light-years away

    Technical card

    Resolution: 3418x2279

    Dates:Nov. 25, 2019

    Frames: 128x900"

    Integration: 32.0 hours

    Avg. Moon age: 28.30 days

    Avg. Moon phase: 1.70%

    Astrometry.net job: 3074679

    RA center: 13.196 degrees

    DEC center: -31.194 degrees

    Pixel scale: 0.803 arcsec/pixel

    Orientation: 320.060 degrees

    Field radius: 0.458 degrees

    Data source: Own remote observatory

    Remote source: Non-commercial independent facility

    Description

    This delicate looking galaxy is located in the Sculptor constellation. It is a very large barred spiral, almost 3 times larger than our own Milky Way. The very faint bluish spiral arms are estimated to be 300,000 light-years across.

    I performed a slight crop on the image as I wanted to retain the feeling of distance from this beautiful galaxy some +70 million light-years away. At this distance, NGC 289 presents the angular dimensions of 5.10 X 3.6 arcmins, a visual magnitude of 11, with a surface brightness of 14.0 mag/arcmin2. This certainly adds to the challenge as the galaxy core small, and its arms are incredibly dim requiring long exposures to reveal them against the background. I really wanted to capture the faint arms and thought I would try 20 min exposures as an experiment in the Luminance channel. I don’t have a data set of 15 min exposures, so I can’t really tell if there is or would be a difference in the end result.

    Instruments:
    10 Inch fl 9.1 RCOS
    Astro Physics AP-900 Mount
    SBIG STL 11000m
    FLI Filter Wheel
    Astrodon Lum, Red, Green, Blue Filters
    Baader Planetarium H-alpha 7nm Narrowband-Filter

    Exposure Details:
    Lum 41 X 1200
    Red 21 X 500
    Green 11 X 500
    Blue 26 X 500
    Ha 21 X 1800

    Total Exposure: 32.21

    Comments

    Author

    trobison
    Terry Robison
    License: None (All rights reserved)
    107623
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    NGC 289 - 70 million light-years away, 





    
        

            Terry Robison