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Contains:  eta Car nebula, NGC 3372, NGC 3324, NGC 3293, Part of the constellation Carina (Car)

Image of the day 03/23/2019

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    The Great Carina Nebula, 





    
        

            Wei-Hao Wang
    The Great Carina Nebula

    The Great Carina Nebula

    Technical card

    Imaging telescope or lens:Takahashi TOA 150

    Imaging camera:Pentax 645z Mod

    Mount:Takahashi EM-400 Temma2

    Guiding telescope or lens:SharpStar 50 ED

    Guiding camera:ZWO ASI290MM Mini

    Focal reducer:Takahashi TOA 67 Flattener

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

    Resolution: 5640x7600

    Dates:Feb. 1, 2019Feb. 3, 2019Feb. 4, 2019Feb. 5, 2019

    Frames: 74x300" ISO1600

    Integration: 6.2 hours

    Avg. Moon age: 21.14 days

    Avg. Moon phase: 3.04%

    Bortle Dark-Sky Scale: 1.00

    Astrometry.net job: 2581997

    RA center: 160.753 degrees

    DEC center: -59.697 degrees

    Pixel scale: 2.036 arcsec/pixel

    Orientation: 0.359 degrees

    Field radius: 2.677 degrees

    Locations: Avon Valley, York, Western Australia, Australia

    Data source: Traveller

    Description

    Four-frame mosaic. Exposure time distribution is somewhat concentrated toward the center, to enhance S/N. My other two recent pictures of this target taken with shorter focal lengths are meant to provide references for registration and gradient removal for this image. This image is the actual goal.

    Ver.A is the original version, which is a bit contrasty and saturated in color.

    Ver.B is a starless version generated by starnet++ and then further processed.

    Ver.C (final) has a lower contrast and saturation, for those with a lighter taste, and is probably safer for most monitors.

    Ver.D is an inverted and starless version of the red channel, to better show the filamentary structures in both the ionized nebulas and the dark nebulas.

    The original image has about 270 mega pixels. To avoid crashing your browser, here I only upload a 0.4x reduced version. A full-resolution version can be browsed in this Gigapan link:
    http://www.gigapan.com/embeds/YLWhWAsO4d4

    If you search very carefully along the left border of this image, you may find two very interesting tiny objects. One is the planetary nebula PN Hf 38, which has a colorful peanut-shaped ring. The other is the Wolf-Rayet star WRAY 15-682, which has a thin red shell around it. To save the fun for you, I will not further indicate where they are. There are also many other small or subtle nebulas in this image.

    This picture probably concludes my endeavor on this target for my entire astrophotography life. With my style of travel imaging, I do not see possibilities of dramatically improving this image unless something in imaging technology fundamentally changes.

    Comments

    Author

    whwang
    Wei-Hao Wang
    License: None (All rights reserved)
    226830
    Like

    Revisions

      The Great Carina Nebula, 





    
        

            Wei-Hao Wang
      Original
      The Great Carina Nebula, 





    
        

            Wei-Hao Wang
      B
    • Final
      The Great Carina Nebula, 





    
        

            Wei-Hao Wang
      C
      The Great Carina Nebula, 





    
        

            Wei-Hao Wang
      D

    Sky plot

    Sky plot

    Histogram

    The Great Carina Nebula, 





    
        

            Wei-Hao Wang