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Contains:  NGC 2077, Tarantula nebula, NGC 2070, NGC 2048, NGC 2018, NGC 1966, NGC 1763, The star εDor, The star δDor, The star θDor, The star βMen, The star μMen

Image of the day 09/08/2019

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    A Giga-Pixel LMC, 


            Wei-Hao Wang
    A Giga-Pixel LMC

    A Giga-Pixel LMC

    Technical card

    Resolution: 7620x8325

    Dates:Feb. 1, 2019Feb. 12, 2019

    217x300" ISO1600
    H alpha: 91x480" ISO1600

    Integration: 30.2 hours

    Avg. Moon age: 16.73 days

    Avg. Moon phase: 27.76%

    Bortle Dark-Sky Scale: 1.00 job: 2896551

    RA center: 80.281 degrees

    DEC center: -68.900 degrees

    Pixel scale: 3.597 arcsec/pixel

    Orientation: 0.973 degrees

    Field radius: 5.639 degrees

    Locations: Avon Valley, York, Western Australia, Australia

    Data source: Traveller


    This is a 20-frame mosaic, and one of my most ambitious projects. The exposures were taken during the 12 nights between Feb 1 and Feb 12 this year in Western Australia. Previously I uploaded a few LMC pictures from this trip, taken with various optics from 85mm to 500mm focal lengths. All these previous pictures were meant to provide registration reference and gradient removal reference for this final large mosaic.

    The regular RGB exposures have a total integration of 18.08 hr. Each of the 20 mosaic panels contains 50 minutes of integration, with the Tarantula region having substantially more integration to enhance S/N.

    The H-alpha exposures were made as a 20-frame mosaic using the same optical setup as the RGB exposures, plus a 12-frame mosaic using the focal reducer instead of the flattener. The distribution of exposure is relatively even in the H-alpha case.

    The original image has 1.01 giga pixels. The one uploaded here is a 1/4 reduction, to avoid overwhelmingly large file size. To see a higher-resolution image, you may take a look at this Gigapan one:
    which is a 2/3 reduction.



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

    Sky plot

    Sky plot


    A Giga-Pixel LMC, 


            Wei-Hao Wang