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.
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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.
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:
Don't get me wrong tho, generally a great program.
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.
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.
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
Yes that's worked Barry, thanks very much!
Should I now clarify my bug report?
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.
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
color=1.0, 1.0, 1.0
color=1.0, 1.0, 1.0
MPC updates the orbital elements every 200 days.
In the previous post orbit_Epoch was JD 2456600.5 (2013 November 04).
Current orbit_Epoch is JD 2456800.5 (2014 May 23).
Next update will be JD 2457000.5 (2014 December 09).
(Special cases are updated more frequently.)
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.
has this been fixed in 0.13.0?
We put new ssystem.ini and updated bookmarks for Solar System Editor plugin.