While looking for the Earth satellites at the highest orbit I found mention of the Vela 1A.
I can understand that different sources have numbers that vary a bit, but in this case the ellipse is very different, I can't figure out why. So which one (if there's one) is right, and optionally why is the other wrong ? Has the initial orbit been modified ?
Note that I've already looked at the NASA page but didn't found information about the orbit.