Our previous entry is based on dubious data. Apparently, Elon’s tweet does not report the correct orbital parameters. You can see this by calculating the \(C_3\) that corresponds to the reported periapsis and apoapsis radii, and verifying that the obtained \(C_3\) is much, much higher.
However, JPL reportedly received an orbit fix, and has performed a preliminary, low-fidelity propagation that leads to the following orbital elements (Geometric, Earth-Mean Equator and Equinox of J2000) at epoch 2018-Feb-09 23:45:01.0000 TDB:
Now we have an apoapsis distance of about \(1.70\) AU (as opposed to the originally-reported \(2.61\) AU). Stay tuned for more data and plots, as soon as we verify the information generated by JPL.