Position of Ceres wrong

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Anonymous
2014-03-05
2015-09-21
  • Anonymous - 2014-03-05

    Hello, I'm pretty sure the position of Ceres is mistaken at the moment, here's an enlarged shot I took last night at 01.13 with the corresponding Stellarium position. As can be seen Ceres is shown, in Stellarium on left, as right beside the mag 6.15 HIP 70022 but in reality is somewhat to the north of that point. The position of Vesta is however spot on. Best wishes.

    Image and video hosting by TinyPic

     
  • barrykgerdes

    barrykgerdes - 2014-03-06

    Stellarium should not be that far out. I suspect you have light speed un-ticked. Stellarium shows the real position unless you tick simulate light speed to take care of the delay it takes for the light to reach you.

    Barry

     
  • Anonymous - 2014-03-06

    I ticked light speed but no change, and Vesta is in the right position... here's the heavens above map showing Ceres in the right spot, and agreeing with my foto:

    Image and video hosting by TinyPic

    Don't get me wrong tho, generally a great program.

     
  • barrykgerdes

    barrykgerdes - 2014-03-06

    I had a good look at Ceres in Stellarium and checked the light speed and that makes almost no difference. I suspect that the orbital parameters in the ssystem.ini file need to be updated. Please submit a bug report and the orbital parameters will be checked.

    Barry

     
  • barrykgerdes

    barrykgerdes - 2014-03-06

    Try this newer set of orbital parameters as a replacement for the entry on [1ceres] in the ssystem.ini. I think this will make your photo the new corrected correct position for Ceres.

    [1ceres]
    name = Ceres
    minor_planet_number = 1
    parent = Sun
    radius = 470
    oblateness = 0.0
    albedo = 0.113
    lighting = false
    orbit_visualization_period = 1680.99
    halo = true
    color = 1.0,1.0,1.0
    tex_halo = star16x16.png
    tex_map = nomap.png
    coord_func = comet_orbit
    orbit_Epoch = 2456600.5
    orbit_MeanAnomaly = 10.557
    orbit_SemiMajorAxis = 2.7668
    orbit_Eccentricity = 0.075797
    orbit_ArgOfPericenter = 72.2921
    orbit_AscendingNode = 80.3276
    orbit_Inclination = 10.593

    Barry

     
  • Anonymous - 2014-03-07

    Yes that's worked Barry, thanks very much!

    Image and video hosting by TinyPic

    Should I now clarify my bug report?

     
  • Anonymous - 2014-05-29

    the positions of Ceres and Vesta are still off after making the corrections posted here.
    Attached are the screen capture of the Stellarium projections and an actual photo of the asteroids for the same time. I've been tracking Ceres, Pallas and Vesta photographically for a few months. The Stellarium errors are largest for Ceres and smallest for Vesta. I've tried using other orbital parameters but no better results.

     
  • barrykgerdes

    barrykgerdes - 2014-05-30

    These are the latest orbital parameters used in Stellarium. Are they the same ones you are using

    These parameters fit your photos for 29th of May

    Barry

    [1ceres]
    name=Ceres
    minor_planet_number=1
    parent=Sun
    radius=470
    oblateness=0.0
    albedo=0.113
    lighting=true
    orbit_visualization_period=1680.15
    halo=true
    color=1.0, 1.0, 1.0
    tex_halo=star16x16.png
    tex_map=nomap.png
    coord_func=comet_orbit
    orbit_Epoch=2456800.5
    orbit_MeanAnomaly=53.2957
    orbit_SemiMajorAxis=2.767026
    orbit_Eccentricity=0.075798
    orbit_ArgOfPericenter=72.3949
    orbit_AscendingNode=80.3283
    orbit_Inclination=10.5939
    type=asteroid
    orbit_MeanMotion=0.2141333

    [4vesta]
    name=Vesta
    minor_planet_number=4
    parent=Sun
    radius=280
    oblateness=0.0
    albedo=0.423
    lighting=true
    orbit_visualization_period=1325.46
    halo=true
    color=1.0, 1.0, 1.0
    tex_halo=star16x16.png
    tex_map=nomap.png
    coord_func=comet_orbit
    orbit_Epoch=2456800.5
    orbit_MeanAnomaly=326.5321
    orbit_SemiMajorAxis=2.36146
    orbit_Eccentricity=0.088612
    orbit_ArgOfPericenter=151.2171
    orbit_AscendingNode=103.8513
    orbit_Inclination=7.1405
    type=asteroid
    orbit_MeanMotion=0.2716021

     
    Last edit: barrykgerdes 2014-05-30
  • barrykgerdes

    barrykgerdes - 2014-05-30

    Please note:

    The ssystem.ini file is only updated with any regularity in the current build 0.13.0. now at build 6805.
    The ssystem.ini file in the release version 0.12.4 needs to be updated manually and can be done via the solar system editor plugin.

    Barry

     
  • qam1

    qam1 - 2014-08-09

    Ok,

    has this been fixed in 0.13.0?

     
    • Alexander Wolf

      Alexander Wolf - 2014-08-09

      We put new ssystem.ini and updated bookmarks for Solar System Editor plugin.

       


Anonymous

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