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Forum » SpaceEngine » Mods and Addons » Adding Nearby Known Stars
Adding Nearby Known Stars
AmwhereDate: Monday, 26.12.2011, 00:30 | Message # 1
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I got annoyed that some of the stars near the solar system aren't in SE... so I added them.
Nothing fancy - just place the files in the right places and at them to the universe.cfg.

Attachments: nearstars.zip(3Kb)


Edited by Amwhere - Monday, 26.12.2011, 00:33
 
SpaceEngineerDate: Monday, 26.12.2011, 10:10 | Message # 2
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Good addon, I'll check it later.




 
HarbingerDawnDate: Monday, 26.12.2011, 13:28 | Message # 3
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Nice addon Amwhere, thanks for putting in the work to make it smile

I noticed that Luyten 789-6 was somewhat incorrect; I've posted my own script (which I adapted from Celestia) which may also be incorrect in some details (mainly star names and orbital inclination):
"Star" script:
Code
StarBarycenter "Gliese 866/Luyten 789-6"
{
  RA    22 38 33
  Dec   -15 18 02
  Dist    3.45418
}

"Planet" script:
Code
Barycenter "Gliese 866 A/Luyten 789-6 A"
{
  ParentBody "Gliese 866"
  Lum      0.00007216
  Mass      0.2

  Orbit
  {
   Period    2.2506
   SemiMajorAxis  0.42
   Eccentricity   0.437
   Inclination    96.2
   AscendingNode  133.5
   ArgOfPericenter 76.4
   MeanAnomaly    241.7
  }
}

Star "EZ Aqr/Gliese 866 Aa/Luyten 789-6 Aa"
{
  ParentBody "Gliese 866 A"
  Class      "M5 V"
  AppMagn    13.03
  Mass      0.105

  Orbit
  {
   Period          0.0104
   SemiMajorAxis   0.013
   Inclination     96
   AscendingNode   133
   MeanAnomaly     180
  }
}

Star "Gliese 866 Ab/Luyten 789-6 Ab"
{
  ParentBody "Gliese 866 A"
  Class      "M6 V"
  AppMagn    15.07
  Mass      0.095

  Orbit
  {
   Period          0.0104
   SemiMajorAxis   0.014
   Inclination     96
   AscendingNode   133
   ArgOfPericenter 180
  }
}

Star "Gliese 866 B/Luyten 789-6 B"
{
  ParentBody "Gliese 866"
  Class      "M5 V"
  AppMagn    13.27
  Mass       0.106

  Orbit
  {
   Period          2.2506
   SemiMajorAxis   0.78
   Eccentricity    0.437
   Inclination     96.2
   AscendingNode   133.5
   ArgOfPericenter 256.4
   MeanAnomaly     241.7
  }
}

This will have the stars orbit their barycenters properly. The star names differ from their accepted values in mine, though I personally prefer Celestia's names over the real ones in this case. I believe the orbit inclination of AB is also wrong in mine (yours is correct, 112.4°).
I think by combining our scripts it will be 100% accurate. Test it out and see what you think.





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miros_0571Date: Monday, 26.12.2011, 16:04 | Message # 4
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New update:
Planet EZ Aquarii AC1 doesn't not exist.
Fixed all names.

Attachments: NearStars.sc(5Kb) · 1321257.sc(3Kb)





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miros_0571Date: Monday, 26.12.2011, 16:24 | Message # 5
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SCR 1845-6357B is not a planet, but it's a brown dwarf class "T6".
http://en.wikipedia.org/wiki/SCR_1845-6357
http://en.wikipedia.org/wiki/List_of_nearest_stars





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Edited by miros_0571 - Monday, 26.12.2011, 16:24
 
AmwhereDate: Monday, 26.12.2011, 19:38 | Message # 6
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About SCR 1845 -
http://exep.jpl.nasa.gov/atlas/atlas_profile.cfm?Star=359

And EZ Aquarii.... Alpha Centauri has no confirmed planets either, yet... smile
 
miros_0571Date: Monday, 26.12.2011, 19:55 | Message # 7
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New update:
"SCR 1845-6357B" is now changed planet to star.
Now addon is ready.

Attachments: 2947634.zip(2Kb)





MS Windows 7 Ultimate 32-bit SP1
Intel Pentium 4 CPU 3.20GHz, 2,0GB RAM, NVIDIA GeForce GTX 260


Edited by miros_0571 - Monday, 26.12.2011, 19:58
 
AmwhereDate: Monday, 26.12.2011, 20:07 | Message # 8
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Updated EZ Aquarii -
Attachments: missingplanets.sc(6Kb)
 
HarbingerDawnDate: Monday, 26.12.2011, 20:49 | Message # 9
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EZ Aqu is still wrong. It is missing a barycenter and the period of star B's orbit is incorrect; it should be 2.2506 years, not 3.8 days.




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AmwhereDate: Monday, 26.12.2011, 21:36 | Message # 10
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It does have a barycenter -
Code

Barycenter "EZ Aquarii Barycenter"  
{  
   ParentBody "EZ Aquarii"  
   Lum      0.00007216  
   Mass      0.2  

   Orbit  
   {  
    Period    2.2506  
    SemiMajorAxis  0.42  
    Eccentricity   0.437  
    Inclination    112.4
    AscendingNode  133.5  
    ArgOfPericenter 76.4  
    MeanAnomaly    241.7  
   }  
}  

As for the period... well, that's the pitfalls of copy and pasting. smile

Attachments: 7579698.sc(6Kb)
 
HarbingerDawnDate: Monday, 26.12.2011, 22:45 | Message # 11
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Gah, my bad, I wasn't paying attention wacko
The orbits of the AC barycenter and the B star are not on the same plane though (fix ascending node), and stars A and C are too far from each other (A should orbit at 0.013 AU from the barycenter; C at 0.014 AU). ArgOfPericenter and MeanAnomaly of B will also have to be changed to match with the AC barycenter (should have same anomaly and 180° different ArgOfPericen).
I think that's all that needs to be changed wink





All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
 
SpaceEngineerDate: Monday, 26.12.2011, 23:19 | Message # 12
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A year ago i download a CCDM catalog (Catalog of Components of Double and Multiple Stars), but still not had time to convert it into SE format. Maybe you guys can make it?

wiki
File format & download

*





 
AmwhereDate: Monday, 26.12.2011, 23:51 | Message # 13
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Take 3!

(As for the catalog, I can at least look into it...)

Attachments: 7761436.sc(6Kb)
 
miros_0571Date: Tuesday, 27.12.2011, 06:35 | Message # 14
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Amwhere I just fixed star SCR 1845-6357B and planet EZ Aquarii AC1 does not exist. Here's final addon.
Attachments: 6586080.zip(2Kb)





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Intel Pentium 4 CPU 3.20GHz, 2,0GB RAM, NVIDIA GeForce GTX 260


Edited by miros_0571 - Tuesday, 27.12.2011, 18:43
 
SpaceEngineerDate: Wednesday, 28.12.2011, 10:12 | Message # 15
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So, when you finish this catalog, I'll add it to the download section of the site, and include it in the next SE version.

*





 
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