Mass, reference area and initial state of Delfi-C3 corrected in all examples

[alopezrivera]

Updated the properties of Delfi-C3 in all examples to make them more realistic:

• Mass: 2.2kg
• Reference area for aerodynamic and radiation pressure accelerations: calculated based on the average shadow of a convex solid (proof in the Math StackExchange) to be 1/4th of the surface area of Delfi-C3 (0.035m2)
• Initial state: obtained from the first available Delfi-C3 TLE (from April the 28th, 2008) in space-track.org

[DominicDirkx]

Thanks for implemeting these changes! Two small comments:

• I see that you still have lageos mentioned in some of the tle/ephemeris variables. Since lageos is the name of a different satellite, please change this to delfic3
• For the very first example (Keplerian orbit), I'd like to keep the code as simple as possible, and not have the TLE in there explicitly. Could you (outside of one of the examples) convert the initial state to Keplerian elements, and then hardcode these in the example as before?

[alopezrivera]

I've fixed the first point. If I'm not mistaken, the state is manually coded in for the keplerian_satellite_orbit example already. Do you mean another example?

[alopezrivera]

I've now manually programmed in the actual initial state of Delfi from the first available TLE, and I've fixed the comment above to say we're manually setting it