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Contains:  IC 4605, rho Oph nebula, IC 4604, IC 4603, M 4, NGC 6121, IC 4601, IC 4592, The star ω1Sco, The star ρSco, The star τLib, The star υLib, The star τSco, The star Al Niyat (σSco), The star πSco, The star Graffias (β1Sco), The star Dschubba (δSco), The star Antares (αSco), Part of the constellation Scorpius (Sco)

Image of the day 06/06/2019

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    Northern Scorpius 2018, 


            Wei-Hao Wang
    Northern Scorpius 2018

    Northern Scorpius 2018

    Technical card

    Imaging telescope or lens:Takahashi Epsilon 180ED

    Imaging cameras:Nikon D810ANikon D800 Mod

    Mount:iOptron CEM60-EC

    Guiding telescope or lens:SharpStar 50 ED

    Guiding cameras:ZWO ASI290MM MiniFishcamp Starfish

    Software:Starnet++ Starnet ++PixInsightAuriga Imaging RegiStarPhotoshop CC

    Resolution: 10360x7210

    Dates:April 17, 2015Sept. 14, 2015June 9, 2018June 15, 2018

    Frames: 1292x180" ISO800

    Integration: 64.6 hours

    Avg. Moon age: 13.97 days

    Avg. Moon phase: 7.81%

    Bortle Dark-Sky Scale: 2.00 job: 2719293

    RA center: 242.264 degrees

    DEC center: -23.879 degrees

    Pixel scale: 6.462 arcsec/pixel

    Orientation: 357.563 degrees

    Field radius: 11.328 degrees

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

    Data source: Traveller


    My 2018 attempt to bring an old image a step closer to perfection.

    The old image is this one:
    The nearly 50 hr of integration was taken between Apr 17 and Sep 14, 2015. However, certain areas in the old image suffer from high noise.

    In 2018, I went back to Hawaii, with the only goal of improving this image. During six nights between June 9 and June 15, 2018, additional 15.2 hr of integration was acquired. The exposures were made in regions where the S/N was low. The image here is the result.

    This is a 25-frame mosaic. Each frame receives at least 2 hr of integration. In some regions, the total integration can be as high as 5 hr.

    The original image contains 610 mega pixels. The version uploaded here is a 0.35x reduction, to avoid crashing your browsers. A 0.5x, pan-zoomable version can be browsed here:

    For fun, I also uploaded a starless version (Ver.B), generated by Starnet++, with additional enhancements, to show the complex structure in the dust clouds.

    Ver.E is an inverted B&W version. Images like this are always attractive to me. It does not only make the fainter nebulosity more apparent, but also brings nostalgia to me. It reminds me the old days when I work in the wet dark room to handle the B&W negatives.

    Ver.G is an enhanced version, to better show the faint nebulas. It's created by blending the normal version and the starless version together.



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


      Northern Scorpius 2018, 


            Wei-Hao Wang
      Northern Scorpius 2018, 


            Wei-Hao Wang
      Northern Scorpius 2018, 


            Wei-Hao Wang
    • Final
      Northern Scorpius 2018, 


            Wei-Hao Wang
      Northern Scorpius 2018, 


            Wei-Hao Wang
      Northern Scorpius 2018, 


            Wei-Hao Wang

    Sky plot

    Sky plot


    Northern Scorpius 2018, 


            Wei-Hao Wang