# What would the TLE data (Mean Motion, Eccentricity, Inclination, RAAN, Argument of Pericenter) of GEO and PO be like?

I am currently making a satellite tracker app for android. I want to test my orbit propagation algorithm and I want to make some made-up basic orbits, so I need to know how their TLE would be. I want to test:

• A geosynchronous equatorial orbit (GEO), so Alt-azimuth would always be the same for a fixed observer.
• Polar orbit (PO), so altitude would be the same for an observer located at one pole of the earth any at any time $$t = t_0 + Period*n$$, $$n \in \mathbb{Z} .$$

So I need to know what would be the values of Mean Motion, Argument of Pericenter, Inclination and Right Ascension of Ascending Node.

I already tried with the following data for GEO:

• $$Mean Motion=1.0$$
• $$Eccentricity=0.0$$
• $$Inclination=0.0$$
• $$RightAscension Of Ascending Node=0.0$$
• $$Argument Of Pericenter=0.0$$

(In the case of PO I guess Inclination would have to be 90 degrees, leaving all the other data unchanged).

But it doesn't seem to work. I don't know if this is an error in my algorithm or if, instead, I just didn't simulate the orbit correctly. I want to find out which are the correct values for those parameters for the orbitals I want. I hope you guys can help me. Thanks in advance.

• Objects in polar orbits don't stay at the same altitude for a polar observer. Objects in polar orbits will be seen to rise and set regardless of your location on the Planet's surface. The only type of orbit where the object maintains a constant altitude above the horizon for an observer at a chosen point on Earth is a geostationary orbit. Commented Aug 3, 2022 at 1:30
• @notovny I meant altitude will be the same at any time t' = t0+ Period*n with n being a whole number. Commented Aug 3, 2022 at 1:54
• The only proper way to use TLE data is to use the SPG code. You should be able to find an implementation is almost any language. If you want to write your own, it's best to test against real, known orbits first. Commented Aug 3, 2022 at 15:33