Galaxy Zoo Talk

Subject: AGZ0002ch9

Subject AGZ0002ch9 Full subject data (JSON)

Comments

  • underearth by underearth

    red and green? why?

    Posted

  • ElisabethB by ElisabethB moderator

    There is even a blue part ! This is probably a fast moving asteroid.
    See the next post for zoomed out and rotated pic.

    Posted

  • ElisabethB by ElisabethB moderator

    http://skyservice.pha.jhu.edu/DR8/ImgCutout/getjpeg.aspx?ra=239.64798649&dec=38.41779927&scale=0.79224&width=512&height=512&opt=&query=

    Posted

  • lostlens by lostlens

    #artifact satellite trail

    Posted

  • planetaryscience by planetaryscience

    might it possibly be a geostationary satellite?

    Posted

  • Budgieye by Budgieye moderator

    fair question, geostationary satellites do "wobble" a bit see http://www.galaxyzooforum.org/index.php?topic=278575.msg512640#msg512640

    Posted

  • Budgieye by Budgieye moderator

    But then I might expect to see more nearby, since there are so many of them up there. Slow moving, so probably medium or high earth orbit.

    Posted

  • c_cld by c_cld

    There are also many rockets launchers of Cosmos , Molnya ,... satellites >= 34000km above earth at angular velocity ~6-12"/s

    Posted

  • c_cld by c_cld

    That yields a trail of ~6-12' on a filter pic. To get a 1' trail or less, few satellites are there above 130000 km: ex. Integral or Geotail

    Posted

  • c_cld by c_cld

    Have in mind an SDSS filter pic of the moon would show a trail of ~29.6 arcsec

    The moon is drifting eastward ~13degree/day

    Posted

  • planetaryscience by planetaryscience

    so your conclusion is..? By the way, using the grid tool it appears that each line is about 22" long.

    Posted

  • c_cld by c_cld

    using Aladin in each filter gives 19.08" for 53.9s i.e. angular velocity of 0.318' / s

    corresponding to satellite distance ~25000-27000km

    Posted

  • c_cld by c_cld

    In this satellite category you have for example

    Insat 4A A5Rk (28913 2005-049-C) Orbit: Shape 659.0 km x 35808.3 km, Period 640.4 mn

    Posted

  • planetaryscience by planetaryscience

    thanks C_cld.

    Posted