What would be the difference in atmospheric re-entry speeds from LEO and GEO, assuming a Hohmman transfer orbit from GEO to re-entry? If I am getting the transfer orbit concept correct?
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1$\begingroup$ I wonder if there has been any reentry from GEO via a Hohmann transfer. The transfer would need too much fuel. Transfer to a graveyard orbit is much cheaper. $\endgroup$ – Uwe Dec 12 '18 at 11:07
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$\begingroup$ @Uwe If there was a station in GEO, is a Hohmann transfer the fastest way for an astronaut to get back to Earth, or would another way be more appropriate? $\endgroup$ – Bob516 Dec 12 '18 at 11:12
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$\begingroup$ Astronauts have been in LEO, on a transfer orbit to Moon and back, in orbit around Moon and on the surface of the Moon. But no astronaut ever stayed in GEO. $\endgroup$ – Uwe Dec 12 '18 at 11:20
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$\begingroup$ @Uwe I am aware of that. I said "if there was a station..." I am asking a hypothetical question. $\endgroup$ – Bob516 Dec 12 '18 at 12:29
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1$\begingroup$ @Bob516 There is little advantage to having a station in GEO. Uwe's point is that people went back from higher than GEO. $\endgroup$ – Antzi Dec 12 '18 at 14:52
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Very easy.
It would be similar to a GTO orbit.
The speed at perigee would be around 9.88 km/s, actually a little bit faster due to the perigee being slightly lower than for GTO.
