Celestia Forums

Posted: **23.07.2009, 19:19**

I decided to undertake a project to add more known minor planets.

Objects to add:
58534 Logos/Zoe
38038 Rhadamanthus
88611 Teharonihiawako/Sawiskera
53311 Deucalion
S/1 90482 Vanth(?) Moon of Orcus

Completed: 19521 Chaos

Code: Select all

# My first add-on
# Created by Audrey Myers (Anima) 
# 23 July 2009

"19521 Chaos:Chaos:1995 WH24" "Sol" { 

   Class "dwarfplanet" 
   Texture "asteroid.jpg" 
   Radius  560             # estimate

   EllipticalOrbit {
      Epoch        2453400.5   
      Period           309.1006
      SemiMajorAxis     45.599       
      Eccentricity       0.102
      Inclination       12.0550     
      AscendingNode     50.0103 
      ArgOfPericenter  58.6836   
      MeanAnomaly      324.2844 
      } 

   UniformRotation
   {
   Period     95.64
   }
}

38083 Rhadamanthus

Code: Select all

"38083 Rhadamanthus:Rhadamanthus:1999 HX11" "Sol" {

   Class "dwarfplanet"
   Texture "asteroid.jpg"
   Radius  560             # estimate

   EllipticalOrbit {
      Epoch        2454100.5   
      Period           245.01
      SemiMajorAxis     39.155    
      Eccentricity       0.152
      Inclination       12.731     
      AscendingNode     10.001
      ArgOfPericenter  81.785
      MeanAnomaly      84.451
      }

   UniformRotation
   {
   Period     39.24   #Actual time unknown
   }

Posted: **28.07.2009, 06:03**

UPDATE

I will likely either postpone or cancel the additon of Logos and Zoe. I do not believe there is sufficient astronomical information to properly include them.

Posted: **15.08.2009, 00:07**

Update 2: I will be including Logos and Zoe. I was able to obtain an orbit model from the orbits of Sirius A and B.

Posted: **15.08.2009, 13:20**

Anima,

It would be great if you could include information about the source(s) of the orbital and other elements of the SSC files. If the information primarily comes from specific places on the Web, an InfoURL statement would be helpful. It would let viewers use the right-mouse-button popup menu to see it.

e.g.
InfoURL "http://en.wikipedia.org/wiki/58534_Logos"
(although a link to a page by the IAU or JPL would be better than wikipedia)

Posted: **18.08.2009, 22:45**

I was unable to find any information on Logos and Zoe at the IAU and JPL. I'm also running into many technical issues with the coding for their orbits. Apparently OrbitBarycenter doesn't work for planets. I got Logos into the program as well as its orbital reference point but I can't seem to get the actual planet into its binary orbit path. That is, Logos and its reference point are in two separate orbits.

Code: Select all

ReferencePoint "Logos-Zoe" "Sol"
{
        EllipticalOrbit {
      Epoch      2452600.5   # 2002 Nov 22
        Period           305.80  # mean
        SemiMajorAxis    45.389    # mass ratio of 0.1166
        Eccentricity     0.12  # mean
        Inclination      2.898    # mean
        AscendingNode   132.564    # mean
        ArgOfPericenter 338.778      # mean
        MeanLongitude    45.885    
   }

    # Make the orbit and label visible
    Visible true
    Clickable true
}
      
"58534 Logos:Logos:1997 CQ29" "Sol" {

   Class "asteroid"
   Texture "asteroid.jpg"
   Radius  770         # estimate

       OrbitFrame {
        EquatorJ2000 { Center "Sol/logos-zoe" }
    }

    BodyFrame {
        EclipticJ2000 { Center "Sol/logos-zoe" }
    }

    EllipticalOrbit {
      Epoch      2452600.5   
        Period           315
        SemiMajorAxis    2043.1     
        Eccentricity     0.45
        Inclination      96.1680    
        AscendingNode   223.0539   
        ArgOfPericenter 337.92      
        MeanLongitude    77.960     
    }
   Albedo 0.09 #assumed

    UniformRotation
    {
    Period      153.292944
    Inclination      115.60
    AscendingNode   228.34
    MeridianAngle   320.75
    }
   
    Albedo           0.39
}

Here's the code I have so far.

Posted: **19.08.2009, 11:41**

One way to specify their orbital dependencies is to declare it in the "path" of the object.
If A revolves around B, which revolves around C, which revolves around D:
"A" "D/C/B" { ... }
e.g.

Code: Select all

"58534 Logos:Logos:1997 CQ29" "Sol/Logos-Zoe" {... parameters ...}

Posted: **20.08.2009, 02:40**

Alright, I've got Logos and the reference point implemented. I'm working on implementing Zoe, but I don't understand how to mirror an orbit.

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