yomahabaca

It's true, I was wrong about that

So if this time I understood correctly, the more one is in a high energy orbit (apoastre and periapsis high) the easier it is to go up its apoastre (ignoring the Oberth effect). If we ignore the Oberth effect, an acceleration of 100 m/s at the periapsis of orbit A2 would increase the apoastre less than the same acceleration on orbit A1 because the orbital energy of orbit A2 is lower than that of the A1 orbit. The lower an orbit has its periapsis, the lower its orbital energy. (If the Oberth effect is taken into account, the A2 orbit would increase its apoastre more than the A1 orbit.) It is as if, the lower an orbit has its periapsis, the more it is held by gravity, which reduces the increase in apoastre for the same delta v applied to the periapsis.

If I understand correctly, the A1 orbit has less energy because it is less in the gravitational well of the Earth and therefore it is easier to exit (raised the apoastre) while the A3 orbit has its periapsis closer to Earth (deeper in the gravitational well) then its average orbital speed is higher and its orbital energy is higher so it is more difficult to raise the apoastre. The A3 orbit benefits more from the Oberth effect than the A1 orbit, but the effect is minor compared to the orbital energy, it becomes the majority for more eccentric orbits such as the A2 orbit.

Thanks a lot ! it really helps me : )

Thank you ! I have another question, is the Oberth effect responsible for the fact that an acceleration of 100m/s from the perigee of a 200km/300km orbit will increase the apogee less than an acceleration of 100 m/s applied to the perigee of an orbit of 200km/10000km?

But there is something that I don't understand, as Leganeski said, on the other side of the planetary orbit we move more slowly with respect to the Sun, so how can the Oberth effect work in this situation (trajectory to go to the inner planets)? isn't the Oberth effect supposed to be stronger the faster the satellite/vessel goes? but in this situation the satellite goes slower than the Earth around the Sun.

Thanks for the explanation ! : )

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