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Image of the day 09/08/2019

Getting plate-solving status, please wait...
    A Giga-Pixel LMC, 



    
        

            Wei-Hao Wang
    Powered byPixInsight

    A Giga-Pixel LMC

    Image of the day 09/08/2019

    Getting plate-solving status, please wait...
      A Giga-Pixel LMC, 



    
        

            Wei-Hao Wang
      Powered byPixInsight

      A Giga-Pixel LMC

      Imaging telescopes or lenses: Takahashi TOA 150

      Imaging cameras: Pentax 645z Mod

      Mounts: Takahashi EM-400 Temma2

      Guiding telescopes or lenses: SharpStar 50 ED

      Guiding cameras: ZWO ASI290MM Mini

      Focal reducers: Takahashi TOA 67 Flattener  ·  Takahashi TOA 645 Reducer F5.6

      Software: Starnet ++  ·  PixInsight  ·  RegiStar  ·  Photoshop CC

      Filters: H alpha


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

      Frames:
      217x300" (18h 5') ISO1600
      H alpha: 91x480" (12h 8') ISO1600

      Integration: 30h 13'

      Avg. Moon age: 16.73 days

      Avg. Moon phase: 27.76%

      Bortle Dark-Sky Scale: 1.00


      Astrometry.net job: 3249749

      RA center: 5h 21' 7"

      DEC center: -68° 54' 5"

      Pixel scale: 3.598 arcsec/pixel

      Orientation: -0.772 degrees

      Field radius: 5.639 degrees


      Resolution: 7620x8325

      Locations: Avon Valley, York, Western Australia, Australia

      Data source: Traveller

      Description

      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:

      http://www.gigapan.com/embeds/cvqQTtTFEvk/

      which is a 2/3 reduction.

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      A Giga-Pixel LMC, 



    
        

            Wei-Hao Wang

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      Images of Taiwan
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