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

Image of the day 05/30/2016

Getting plate-solving status, please wait...
    Northern Scorpius, 


            Wei-Hao Wang
    Northern Scorpius
    Powered byPixInsight

    Northern Scorpius

    Technical card

    Imaging telescopes or lenses: Takahashi Epsilon 180ED

    Imaging cameras: Nikon D810A  ·  Nikon D800 Mod

    Mounts: iOptron CEM60-EC

    Guiding telescopes or lenses: SharpStar 50 ED

    Guiding cameras: Fishcamp Starfish

    Software: PixInsight  ·  RegiStar  ·  Photoshop CC

    Dates:April 17, 2015Sept. 14, 2015

    Frames: 988x180" ISO800

    Integration: 49.4 hours

    Avg. Moon age: 14.57 days

    Avg. Moon phase: 1.88%

    Bortle Dark-Sky Scale: 1.00

    Basic astrometry details

    Astrometry.net job: 1094186

    RA center: 16h 9' 25"

    DEC center: -23° 51' 39"

    Pixel scale: 6.545 arcsec/pixel

    Orientation: -179.012 degrees

    Field radius: 11.401 degrees

    Resolution: 10290x7175

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

    Data source: Traveller


    This is a 25-frame mosaic. The total exposure time is roughly 50 hr (2 hr per frame). The exposures were collected between 2015/04/17 and 2015/09/14 over 20 different nights.

    Three versions are uploaded:
    The original (also the final) is a standard version that balances everything.
    Ver.B has nebulas more strongly enhanced.
    Ver.C has stars removed and nebulas even more strongly enhanced, to show all the complex structure in the gaseous and dusty clouds, and also to show the very faint clouds. Unfortunately it also shows many low level artifacts of my mosaicking, but it's still fun to watch.

    The original mosaic contains 600 Mega pixels and it is not practical to upload this image here. The standard version uploaded here is a 0.35x reduction. I know Safari sometimes has difficulty to display large images on astrobin. You may need to use a different browser such as Firefox to see it. Alternatively, you can use this link:
    to navigate through the 0.5x reduced image.

    The total exposure time (50 hr) may sound very long to you. The processing time is even longer. It is probably more than 200 hr, if I include the processing of the preparation images. The image that were taken to prepare for the present one are this:
    and this:
    These wide-field images were taken to help to layout the final large mosaic here. They also help to better determine and subtract the sky gradient in the mosaic panels, so a seamless mosaic can be made.

    This is one of the most ambitious and time consuming work I had ever carried out in amateur astrophotography.

    I hope you enjoy it.

    Edit: a newer version can be found here: http://www.astrobin.com/407984/D/



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


    • Final
      Northern Scorpius, 


            Wei-Hao Wang
      Northern Scorpius, 


            Wei-Hao Wang
      Northern Scorpius, 


            Wei-Hao Wang

    Sky plot

    Sky plot


    Northern Scorpius, 


            Wei-Hao Wang

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    Deep Sky Mosaics