China's Space Program News Thread

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Brigadier
Registered Member
I am sorry for asking a naive question.
can SJ 21 tug a dead satellite and release the latter at a lower orbit to reenter and burn out in the atmosphere?
technical and safety problems? Cost issues??
so much space junk needed to be disposed of.
At GEO, it's much easier to tow a dead satellite up to graveyard orbit then it is to tow it down to deorbit.

The different in delta-V is huge. It's why the same rocket can launch much more to LEO than to GTO.
 

Jono

Junior Member
Registered Member
At GEO, it's much easier to tow a dead satellite up to graveyard orbit then it is to tow it down to deorbit.

The different in delta-V is huge. It's why the same rocket can launch much more to LEO than to GTO.
that means space junks can never really be cleaned up in the truest sense of the word, thank you.
 

Richard Santos

Captain
Registered Member
that means space junks can never really be cleaned up in the truest sense of the word, thank you.
Never is too strong. objects on geosynchronized orbits are stiill susceptible to drag from earth‘s extended atmosphere, so their orbits will decay But it will take 10s of millions of years for satellite sized object to decay from geosynchronized orbits.
 

FairAndUnbiased

Brigadier
Registered Member
Never is too strong. objects on geosynchronized orbits are stiill susceptible to drag from earth‘s extended atmosphere, so their orbits will decay But it will take 10s of millions of years for satellite sized object to decay from geosynchronized orbits.
From my understanding, in GEO atmosphere is negligible.
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In LEO at a 300 km the pressure is calculated ~1E-12 torr, which is better than any artificial vacuum at sea level. Empirically this is true as well. GEO is 30000 km.

I believe orbital mechanics beyond GEO are determined more by perturbative gravitational forces from other solar system objects, radiation pressure, solar wind pressure, etc. than anything to do with the atmosphere.
 

iantsai

Junior Member
Registered Member
that means space junks can never really be cleaned up in the truest sense of the word, thank you.
We can't remove the junk spacecrafts from the orbit because the kinetic energy of the satelites is expensive.

If nuclear power and electromagnetic propulsion technology are appliable and popularized, junk sweepers like SJ21 could push down the junks back to earth then accelarate and redeploy itself.
 

by78

General
100-kW Hall-effect thrusters.

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