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Contains:  Witch Head nebula, IC 2118, The star λEri, The star ψEri

Image of the day 01/12/2019

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            Shenyan Zhang

    Technical card

    Resolution: 3474x4226

    Dates:Jan. 6, 2019

    Frames: 150x180"

    Integration: 7.5 hours

    Avg. Moon age: 0.39 days

    Avg. Moon phase: 0.17% job: 2455593

    RA center: 75.472 degrees

    DEC center: -7.811 degrees

    Pixel scale: 3.993 arcsec/pixel

    Orientation: 86.849 degrees

    Field radius: 3.034 degrees

    Locations: Gemini Observatory, LI JIANG, YUN NAN, China

    Data source: Backyard


    This is a 2-frame mosaic. The total exposure time is roughly 7hr (3.5 hr per frame). The exposures were collected between 2019/1/5 and 2019/1/6 over 2 different nights.

    This suggestively shaped reflection nebula is associated with the bright star Rigel in the constellation Orion. More formally known as IC 2118, the Witch Head Nebula glows primarily by light reflected from bright star Rigel, located just off the upper right edge of the full image. Fine dust in the nebula reflects the light. The blue color is caused not only by Rigel's blue color but because the dust grains reflect blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in Earth's atmosphere are molecules of nitrogen and oxygen. The nebula lies about 1000 light-years away.



    Shenyan Zhang
    License: None (All rights reserved)

    Sky plot

    Sky plot




            Shenyan Zhang