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- Newsgroups: sci.space
- Path: sparky!uunet!cs.utexas.edu!torn!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Re: What happened to Viking?
- Message-ID: <BtGMGs.Dw6@zoo.toronto.edu>
- Date: Sun, 23 Aug 1992 23:26:49 GMT
- References: <1992Aug20.233734.691@ringer.cs.utsa.edu> <1992Aug21.222739.19157@nas.nasa.gov>
- Organization: U of Toronto Zoology
- Lines: 37
-
- In article <1992Aug21.222739.19157@nas.nasa.gov> eugene@wilbur.nas.nasa.gov (Eugene N. Miya) writes:
- >>What happened the Viking spacecraft?
- >
- >Both lands and orbiters were shut down for lack of funds and the need to use
- >the antenna resources for other projects (Galileo, Magellan, power
- >distribution experiments, SETI, etc.)
- >
- >>I heard through the grapevine that someone sent a bogus signal to it which
- >>turned the antenna away from Earth, resulting in LOS.
- >
- >That was Voyager II (briefly).
-
- Eugene, are you getting enough sleep? :-) This does *not* correspond to
- the history of Viking as I'm aware of it.
-
- Although antenna coverage was reduced as the Viking primary mission was
- completed, it wasn't eliminated. And although there was *talk* of shutting
- down the program for funding reasons, it never quite happened.
-
- Both the Viking orbiters were shut down when, as expected, they ran out of
- attitude-control fuel after lengthy and successful missions. The second
- lander had some sort of electrical problem that cut its life short; I don't
- remember the details. The first one lasted several more years, in a low-
- activity mission that did weather reporting and an occasional image, using
- modest funding and very little antenna time. It was during this phase that
- there was some threat of shutting it off due to funding shortages, but
- politicking (including the Viking Fund's fundraising activity, which had
- far more significance as a political message than as an actual source of
- money) averted that. What finally happened was that a routine contact
- to pick up recent weather data couldn't get an answer from the lander,
- all attempts to reach it failed, and it was eventually declared dead.
- I believe it *was* eventually established that this was due to a command
- error that fouled up antenna pointing, although this was not obvious at
- the time.
- --
- There is nothing wrong with making | Henry Spencer @ U of Toronto Zoology
- mistakes, but... make *new* ones. -D.Sim| henry@zoo.toronto.edu utzoo!henry
-