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Contains:  M 7, NGC 6475, NGC 6383, NGC 6357, NGC 6334, NGC 6281, IC 4628, rho Oph nebula, IC 4604, IC 4592, The star πSco, The star Lesath (υSco), The star Graffias (β1Sco), The star κSco, The star Sabik (ηOph), The star Dschubba (δSco), The star εSco, Sargas (θSco), The star Girtab, The star Shaula (λSco), The star Antares (αSco), The constellation Scorpius (Sco), Part of the constellation Ophiuchus (Oph), Part of the constellation Lupus (Lup), Part of the constellation Norma (Nor)

Image of the day 05/04/2015

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    Scorpius, 





    
        

            Wei-Hao Wang
    Scorpius

    Scorpius

    Technical card

    Resolution: 1860x2800

    Dates:April 19, 2015April 25, 2015

    Frames:
    52x120" ISO1600
    34x180" ISO800

    Integration: 3.4 hours

    Avg. Moon age: 3.86 days

    Avg. Moon phase: 22.89%

    Bortle Dark-Sky Scale: 1.00

    Astrometry.net job: 626415

    RA center: 251.286 degrees

    DEC center: -31.566 degrees

    Orientation: 168.553 degrees

    Field radius: 24.217 degrees

    Locations: Maunakea Visitor Information Station, Hilo, Hawaii, United States

    Data source: Traveller

    Description

    The lens is stopped down to approximately F3.5. Two cameras are used: Nikon D800 and Canon EOS 5D2, both modified. (D800: 3 min * 34 @ ISO 800; 5D2: 2 min * 52 @ ISO 1600) D800 only contributes to data in the upper-right corner (roughly 1/3 of the total image area), including the Antares region. The integration time from each of D800 and 5D2 is 1.7 hr.

    Three versions are provided:

    Original: the version with data from 5D2 only.

    Ver B: bright stars diffused (in Photoshop) to better show the shape of the constellation, also 5D2 only.

    Ver C (final): the version with data from both 5D2 and D800. The upper-right corner (about 1/3 of the total image area, including the Antares region) is contributed by D800. The remaining 2/3 of the image is contributed by 5D2. By comparing Ver C with the original, you can see how superior D800 is in terms of image sharpness and sensitivity to faint nebulas.

    Comments

    Author

    whwang
    Wei-Hao Wang
    License: None (All rights reserved)
    304233
    Like

    Revisions

      Scorpius, 





    
        

            Wei-Hao Wang
      Original
      Scorpius, 





    
        

            Wei-Hao Wang
      B
    • Final
      Scorpius, 





    
        

            Wei-Hao Wang
      C

    Sky plot

    Sky plot

    Histogram

    Scorpius, 





    
        

            Wei-Hao Wang