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Contains:  NGC 247

Image of the day 02/17/2019

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    NGC 247, 





    
        

            Terry Robison
    NGC 247

    NGC 247

    Technical card

    Resolution: 3230x2152

    Frames: 82x900"

    Integration: 20.5 hours

    Astrometry.net job: 2514410

    RA center: 11.808 degrees

    DEC center: -20.736 degrees

    Pixel scale: 0.804 arcsec/pixel

    Orientation: 298.340 degrees

    Field radius: 0.433 degrees

    Data source: Own remote observatory

    Remote source: Non-commercial independent facility

    Description

    NGC 247 is an intermediate spiral Galaxy located in the constellation Cetus. It is a member of the Sculptor group located approximately 11.1 million light years away. The most striking feature of this Galaxy is the void. It contains stars that are different from those around. They are older, redder in colour, and much fainter. This suggests that the star formation within the void has been arrested, and slowed a billion years ago. We are still unsure how the void has formed. Recent studies suggest that it might have been formed by gravitational interactions with another galaxy, or even a recent interaction with a nearly dark subhalo that collided with the disc.

    The centre of the Galaxy is visible as a bright patch surrounded by a mixture of stars, gas, and dust. Silhouetted against the background of stars the dust and gas have formed interesting filaments.

    The best month for viewing NGC 247 is in November when it is at its highest altitude. It has an apparent magnitude of 9.9, and an apparent size of 21'.4 × 6'.9.

    I like to think that most photos contain an interesting trinket. At first, I thought that I had a wacky artifact. After further research, the smudge was indeed real. Look to the top right-hand side of the photo and locate the two galaxies like structures with a milky trail connecting the two. The smallest is MCG-4-3-12 at Mag 17, less than 0.5' in size. Its classification is "unknown". The larger is a galaxy, ESO 540-23 SBb, Mag 14.46, 1' X 0.39'. I did find some images from much larger telescopes than my instrument confirming what appears to be a bridge of material appearing to connect to two objects. That’s pretty wild stuff. I can only imagine what happened to create such an incredible formation.

    Image Details
    Center (RA, hms): 00h 47m 19.577s
    Center (Dec, dms): -20° 43' 59.305"
    Size: 47.8 x 31.8 arcmin
    Radius: 0.43 deg
    Pixel scale: 0.804 arcsec/pixel

    Instruments:
    10 Inch RCOS fl 9.1
    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:
    37 X 900 Bin 1X1 Lum
    21 X 450 Bin 2X2 Red
    21 X 450 Bin 2X2 Green
    22 X 450 Bin 2X2 Blue
    13 X 900 Bin 1X1 Ha

    Total time: 20.5 hours

    Location
    Australia, Central Victoria

    Comments

    Author

    trobison
    Terry Robison
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    NGC 247, 





    
        

            Terry Robison