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questions# Astronomy - 天文

r*o2003-07-14 07:07

1 楼

in http://liftoff.msfc.nasa.gov/RealTime/JTrack/3D/JTrack3D.html
I saw that there are a lot of satellites in the geostationary orbit.
But there are also some points very close to the geostationary orbit
yet not exactly on it. Won't those satellites move around at high orbits?
why ppl do that?
ps, how can each satellite avoid each other? Are all the orbits of the
sattelites known to everyone? What about those military ones?

z*j2003-07-14 07:07

2 楼

not all orbits are known by everyone. only unclassified orbits are published,
but some amateurs publish orbits of classified satellites derived from their
own observation (this practice may have discontinued after 9/11).
i don't know how the satellites avoid each other, but for geosynch satellites
each one has a defined window within which they can drift around -- this is to
save propellant since keeping `true geostationary' would be very hard and
would need far more frequent adjustment. at t

【在 r***o 的大作中提到】

: in http://liftoff.msfc.nasa.gov/RealTime/JTrack/3D/JTrack3D.html
: I saw that there are a lot of satellites in the geostationary orbit.
: But there are also some points very close to the geostationary orbit
: yet not exactly on it. Won't those satellites move around at high orbits?
: why ppl do that?
: ps, how can each satellite avoid each other? Are all the orbits of the
: sattelites known to everyone? What about those military ones?