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Moving Hubble close to the ISS.
Hubble is orbiting with a perigee of 584km and an apogee of 618km.
Would it still function if it was manouvred into an orbit matching that of the ISS (perigee 361km apogee 437km) and parked 100 metres away from it? It would make servicing it a lot cheaper because the two missions (resupply of ISS and servicing of Hubble) could be combined. M.M. |
#2
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Moving Hubble close to the ISS.
Would it still function if it was manouvred into an orbit matching that of
the ISS (perigee 361km apogee 437km) and parked 100 metres away from it? It would require more frequent reboosts, so it might want to spend some of its time a bit higher, but especially if it had its own propulsion added, this wouldn't really be a problem. It would make servicing it a lot cheaper because the two missions (resupply of ISS and servicing of Hubble) could be combined. Not exactly. Limits on crew time and upmass would still apply, so you wouldn't necessarily get resupply/servicing "for free". But it would mean that the shuttle could dock with ISS for tile inspection and possibly emergency shelter. In the post-Columbia environment, that's a very big consideration. See http://www.spaceref.com/news/viewsr.html?pid=10083 for one blurb about robotic reboosting of Hubble. Whether this happens is very much to be determined. (I sort of like the idea which is floating around to build a new space telescope incorporating one or both of the Hubble instruments which would have been on the cancelled servicing mission. But how practical/affordable *that* will be is also very much to be determined). |
#3
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Moving Hubble close to the ISS.
On Fri, 23 Jan 2004 19:50:50 -0800 (PST), in a place far, far away,
Jim Kingdon made the phosphor on my monitor glow in such a way as to indicate that: Would it still function if it was manouvred into an orbit matching that of the ISS (perigee 361km apogee 437km) and parked 100 metres away from it? It would require more frequent reboosts, so it might want to spend some of its time a bit higher, but especially if it had its own propulsion added, this wouldn't really be a problem. The problem with it not being at the same altitude is that the relative nodes will drift, putting it into a different orbital plane over time. I suspect that its drag coefficient is less than ISS'. |
#4
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Moving Hubble close to the ISS.
Good morning,
Hail, MarkMcDonald! We who are about to post salute you. Hubble is orbiting with a perigee of 584km and an apogee of 618km. Would it still function if it was manouvred into an orbit matching that of the ISS (perigee 361km apogee 437km) and parked 100 metres away from it? It would make servicing it a lot cheaper because the two missions (resupply of ISS and servicing of Hubble) could be combined. I note that HST controls orientation using reaction wheels. This is so that residue from attitude control jets' exhaust doesn't affect the imagery (and perhaps to prevent damage to the optics?). ISS' attidue control and orbit boosting are managed using rocket motors fed monomethyl hydrazine and nitrogen tetroxide. Keeping ISS near a steady source of rocket exhaust would defeat the point of those reaction wheels. OTOH, so would reentry... Take care, cb -- Christopher A. Bohn ____________|____________ http://www.cis.ohio-state.edu/~bohn/ ' ** ** " (o) " ** ** ' 24 January 1946 -- Gen Carl Spaatz named the first chief of staff of the Army Air Forces. |
#5
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Moving Hubble close to the ISS.
hmm....how about making the thing a new(old) module of the Iss?
Then it would at least be servicable from the Iss... Regards VGA "MarkMcDonald" wrote in message ... Hubble is orbiting with a perigee of 584km and an apogee of 618km. Would it still function if it was manouvred into an orbit matching that of the ISS (perigee 361km apogee 437km) and parked 100 metres away from it? It would make servicing it a lot cheaper because the two missions (resupply of ISS and servicing of Hubble) could be combined. M.M. |
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