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- From: higgins@fnalo.fnal.gov (Bill Higgins-- Beam Jockey)
- Newsgroups: sci.space
- Subject: LGA-only mission (was Re: Relay to Follow Galileo?)
- Date: 15 Dec 92 11:15:20 -0600
- Organization: Fermi National Accelerator Laboratory
- Lines: 50
- Message-ID: <1992Dec15.111520.1@fnalo.fnal.gov>
- References: <246900038@peg.pegasus.oz.au> <246900039@peg.pegasus.oz.au> <20100@ksr.com>
- NNTP-Posting-Host: fnalo.fnal.gov
-
- In article <20100@ksr.com>, clj@ksr.com (Chris Jones) writes:
- > In article <246900039@peg.pegasus.oz.au>, wlmss@peg writes:
- >>This is astonishing! Surely to NOT chase the thing is too costly! Dosen't
- >>the media, public & govt understand?
-
- [Very good explanation by Chris deleted, giving reasons to be hopeful about
- Galileo, including:]
-
- > 1. The attempts to succeed in opening the antenna may still succeed. [...]
- >
- > 3. [...] the descent probe mission is unaffected by the lack of an HGA
-
- I have a small nit to pick with:
-
- > 2. A combination of beefing up the Deep Space Network on earth and improving
- > the compression software on the spacecraft should allow
- > 70% of the science data
- > to be returned over the Low Gain Antenna even if the HGA deployment fails.
-
- It's not "should allow 70% of the science data to be returned," it's
- "should allow 70% of the `scientific objectives' to be met." Weasel
- wording, but the project scientists carefully explained the
- distinction in their press conference last 11 June. Major objectives
- include direct measurement of the Jovian atmospheric structure and
- composition (the descent probe), satellite science (mostly a series of
- brief flybys, with many weeks in between to send back recorded data
- slowly), magnetospheric studies (data rates are not very high compared
- with imaging, can get much of original science), and remote-sensing
- studies of the Jovian atmosphere. This last objective takes a big
- hit, since it relies on movies of the "weather--" lots of images (like
- many tens of thousands), therefore lots of bits.
-
- They're cutting back on the planned acquisition of data in all these
- areas and the final accounting the Galileo folks announced went like
- this:
-
- Science objectives summary
-
- Atmospheric - 80% (probe mission unaffacted)
- Satellites - 70% (don't need that many pictures)
- Magentosphere - 60% (continuous coverage available)
- Mission total - 70%
-
- Bill Higgins, Beam Jockey | The restaurant's architect
- Fermi National Accelerator Laboratory | said every effort had been
- Bitnet: HIGGINS@FNAL.BITNET | made to build McDonald's
- Internet: HIGGINS@FNAL.FNAL.GOV | 15th outlet in Italy
- SPAN/Hepnet: 43011::HIGGINS | in harmony with Pompeii.
- | --Reuters story in *Chicago
- | Sun-Times*, 18 June 92
-