NASA Europa Missions, projects and proposals for the 2020s |
NASA Europa Missions, projects and proposals for the 2020s |
Mar 5 2014, 12:53 AM
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Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
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Jun 21 2015, 06:15 PM
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Cassini doesn't have a scan platform; has not been a problem. After Voyager 2's jammed I think that there's been a shift away from them in order to minimize mechanical complexity and thus reduce the chances of mission-limiting malfunctions.
Cassini also doesn't have a furlable HGA, partially for the same reason & after Galileo. I know that some of the early designs considered one. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jun 22 2015, 01:58 AM
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Member Group: Members Posts: 715 Joined: 22-April 05 Member No.: 351 |
Cassini doesn't have a scan platform; has not been a problem. After Voyager 2's jammed I think that there's been a shift away from them in order to minimize mechanical complexity and thus reduce the chances of mission-limiting malfunctions. Cassini also doesn't have a furlable HGA, partially for the same reason & after Galileo. I know that some of the early designs considered one. Actually, the lack of a scan platform or independently steerable antenna on Cassini has been considered a continuing nuisance, and one that future missions will want to avoid. However, that's not so much of a problem for Europa Clipper. Cassini makes observations throughout its orbit, and so scheduling time when remote sensing can be done versus data returned to Earth has been a problem. The Clipper will make observations only in the day or two around each encounter. Almost all of the rest of the orbit will be spent returning the data to Earth. (Presumably there will be some time spent observing Europa from a distance for plumes.) So there isn't the degree of scheduling problem. Where the lack of scan platform/steerable antenna is a problem is for precise tracking for gravity measurements during closest encounter. The last plans I saw had two small antenna that would point to Earth during the encounters. -------------------- |
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