General Question ISS orbital data

[Delta glider]

Does anybody have any, or know how to get scenario code for the ISS's live position. If you know someway to get this or calculate it then I would greatly appreciate.

---------- Post added at 09:09 AM ---------- Previous post was at 09:08 AM ----------

I really want to simulate this in orbiter.

 

[Urwumpe]

http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/orbit/ISS/SVPOST.html

There you have the latest one.

The J2K (Julian Epoch 2000, "J2K Cartesian") data on the page what you are looking for, but you should remember that Orbiters coordinate system is left-handed and not right-handed.

 

[Delta glider]

I am a bit confused by all that data.
What bits should I put in my scenario?

 

[Urwumpe]

I am a bit confused by all that data.
What bits should I put in my scenario?

Search for blocks like that:

          M50 Cartesian                         J2K Cartesian  
    -----------------------------------       --------------------------------
     X    =       -6300920.66                 X    =        -1843631.11
     Y    =      -21055383.15  feet           Y    =        -6438727.45  meter
     Z    =       -3365302.42                 Z    =        -1034886.61
     XDOT =      15873.357093                 XDOT =        4872.312236
     YDOT =      -1655.549270  feet/sec       YDOT =        -450.317177  meter/sec
     ZDOT =     -19471.490580                 ZDOT =       -5911.324142

Now, before I say something wrong, I'll better check Orbiters definition of the Earth-relative coordinate system in comparison to the standard J2K Cartesian coordinate system.

The J2K Cartesian data is almost exactly what Orbiter writes into the scenario files for the current velocity and position.

 

[Delta glider]

What I meant was how do I incorporate that into

RPOS 6604547.60 32785.98 -1288983.25
  RVEL 431.660 -7419.871 2010.494
  AROT 110.00 -10.00 80.00

 

[Urwumpe]

That's a bit more math: Orbiter and NASA use slightly different (but both right handed!) coordinate systems.

You would need a transformation matrix for the reference time (J2K) of the orbital data to rotate from Z is Earth axis to Z axis as ecliptic north.

 

[Delta glider]

Oh no! I've just done my maths homework.

 

[Urwumpe]

Oh no! I've just done my maths homework.

I am really sorry - but I am sure there is a tool on OH that does the job for you.

[ame="http://orbithangar.com/searchid.php?ID=2617"]Scenario Editor TLE[/ame]

 

[boogabooga]

Just to clarify, look for the Norad two-line elements that look like this:

ISS
1 25544U 98067A   15113.46969423  .00016717  00000-0  10270-3 0  9168
2 25544  51.6471 357.3820 0006348 261.0247  99.0188 15.55754285 19526

Copy these lines into an empty text document and save. Then use the add-on Urwumpe mentioned. You have a new option when specifying state vectors to import TLE data. Pause the simulation. Open the file where you saved the TLE data, then hit apply.

 

[Delta glider]

Thank you.