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Wednesday, November 12, 2014


Comet 67P/Churyumov–Gerasimenko in Celestia

Comet 67P//Churyumov–Gerasimenko and the Rosetta orbiter rendered in Celestia.

As usual, I have been trying to make a Celestia file for comet 67P.

And failing miserably. I tried to convert the ESA public shape model to celestia 3Ds format and failed miserably. So I ended up using Jack Selden's Rosetta files, with a surface map taken from this thread on the Celestia. The Celestia comet looks nothing like the rubber duck shape of 67P, but until some kind person points me to a pubic Celestia shape model that is what I am stuck with.

I utterly failed to make any of the XYZ orbital files work for me, so I just copied the orbit of Dactyl around Ida. Yes, that's cheating, but after days of frustration I wanted something that works. If you want a stunning Celestia simulation, go here.

As usual, copy the code below and save as it as a text file 67P.ssc in the Celestia extras folder.
# Taken from Jack Seldens 67P ssc file
# Created By Ian Shazell, Spacecraft Analyst for Rosetta
# On Behalf of the European space Agency, www.esa.int
# Comet 67P Churyumov-Gerasimenko, Celestia SSC file. www.shatters.net/celestia
"Churyumov-Gerasimenko" "Sol"
    Class "comet"
    Mesh "asteroid.cms"
        Texture "67p720x361.png" # texture from the Celestia forum from
    Radius 1.98                             # http://forum.celestialmatters.org/viewtopic.php?f=4&t=690
        Period                   6.4451441700205338809034907597536
        PericenterDistance       1.2431213
        SemiMajorAxis          3.4632382 
        Eccentricity            0.6410523343769
        Inclination            7.04073996
        AscendingNode          50.150595169
        ArgOfPericenter        12.77512076
                MeanAnomaly            -71.72623185
        Epoch                   2456778.5
        Albedo            0.2

"Rosetta" "Sol/Churyumov-Gerasimenko"
        Class "spacecraft"
        Mesh "rosetta.3ds" # rosetta model http://homepage.eircom.net/~jackcelestia/files/rosetta.zip
        Radius 0.005

    Epoch         2449228.2028  # Using orbit of Dactyl around Ida
    Period             0.96534 #
    SemiMajorAxis     25.0     # Why? I can't make anything else work
    Eccentricity       0.13    #
    LongOfPericenter 310       #
    AscendingNode     90       #
    Inclination        8       #

        Albedo 0.5
======================end 67P.ssc==========================

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So, is the 67P.ssc file the only one that needs to be added to Celestia ?
No, you also need the rosetta lander model
and the texture file
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