Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  The star 136Tau, The star 125Tau, The star 26Aur

Image of the day 09/24/2013

Getting plate-solving status, please wait...
    Simeis 147, 


    Simeis 147

    Technical card

    Imaging telescope or lens:Canon EF 200mm f1.8

    Imaging camera:QHY9 Mono

    Guiding camera:Lodestar

    Software:photoshopCartes du CielMaxim DLCCDStack

    Filters:SIIBaader Planetarium H-Alpha FilterOIII

    Accessory:Optec TCF-S

    Resolution: 1432x1110

    Dates:Sept. 20, 2013

    Frames: 118x1200"

    Integration: 39.3 hours

    Avg. Moon age: 15.84 days

    Avg. Moon phase: 98.69% job: 86865

    RA center: 84.960 degrees

    DEC center: 28.059 degrees

    Pixel scale: 13.059 arcsec/pixel

    Orientation: 41.603 degrees

    Field radius: 3.287 degrees

    Locations: Astro Anarchy Observatory, Oulu, Finland, Finland


    Simeis 147 (sharpless 240), is a very faint and very large supernova remnant in constellation Taurus at distance of ~3000 light years. It's constantly expanding at speed of 1000 km/second but due the size of it, we can't see any movement in it. This SN spans over 160 light years and the apparent scale in the sky is about three degrees (Moon has an apparent size of 30" = 0,5 degrees). Explosion took place approximately 30.000 years ago and left behind a pulsar (Neutron star). The pulsar has recently identified.

    I just did a small calculation, how long it takes to this supernova remnant to expand 1% large when the diameter is 160 light years and it expands at speed of 1000km/second.
    Answer is ~480 years.
    (1% of diameter 160/100= 16, as kilometers ~151.372.800.000.00, = Y, km,
    1000km/second is ~315.360.000.00, = Z, kilometers/year.
    So, X x Z = Y and X=Z/Y, X = 480 with given values)

    This is a difficult target to image and image above is my second try to capture it. An older version can be seen here. This older image was my second APOD from NASA.

    Technical details:

    Processing work flow:
    Image acquisition, MaxiDL v5.07.
    Stacked and calibrated in CCDStack2.
    Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 33 % weight
    Levels, curves and color combine in PS CS3.

    Optics, Canon EF 200mm camera lens at f1.8
    Camera, QHY9
    Guiding, Meade LX200 GPS 12" and a Lodestar guider
    Image Scale, ~5,5 arcseconds/pixel
    H-alpha 34x900s, Binned 1x1 = 8,5h
    H-alpha 24x1800s, Binned 1x1 = 12h
    O-III 60 x 300s, Binned 3x3 = 5h
    S-II 6 x 600, Binned 3x3 = 1h

    Total exposure time for Hydrogen alpha alone is ~20,5h
    Total exposure time is 26,5h



    License: Attribution-NonCommercial-NoDerivs Creative Commons


      Simeis 147, 


      Simeis 147, 


    • Final
      Simeis 147, 



    Sky plot

    Sky plot


    Simeis 147,