PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
 PUBLICATION_DATE     = 2007-07-27
 NOTE                 = " E-mail and other messages
                          concerning MGS Radio Science on
                          or about 1997/301."
END_OBJECT            = TEXT
END


From trish@rodan.jpl.nasa.gov Tue Oct 28 16:49:49 1997
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Date: 28 Oct 97 16:51:28 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Radio Science Update
To: Georges Balmino <balmino@pontos.cnes.fr>,
        David Hinson <hinson@nimbus.Stanford.EDU>,
        Frank Lemoine <flemoine@olympus.gsfc.nasa.GOV>,
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CC: Bill Adams <William.R.Adams@ast.lmco.com>,
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Status: R

Hello,

Today's reset meeting encompassed the remainder of the contingency
science passes.  We will continue to collect as much one-way data
through periapsis as we can, but the DSN receivers cannot hold lock
beyond 60 degrees off-Earth point.  We did not pursue rotating the
spacecraft in order to better point the LGA toward Earth.  Even if we
had asked to do the rotation for P35 and P36, MOC is getting better
NADIR images now, and the altitude would have been too high when we were
flying over anything of interest.

>From the closed-loop data that we have collected, Bill Sjogren has
determined that the data are at the 0.25 mm/sec level.  We also learned
that the DSN receivers can track the carrier down to 60 degrees
off-Earth point in this LGA configuration and geometry.

Joe Twicken is using the open-loop data to create an LGA antenna pattern.
 The carrier could be tracked to about 80 degrees off-Earth.

We are also using the fully-automated reliable data delivery system to
obtain our open-loop data.  The data from periapsis 29 went through very
smoothly and were on the TDS with no missing records less than an hour
and a half after we idled the DSP.  Data from other periapses have not
been delivered as smoothly, but it is not clear whether that is a
reliable data delivery problem or a TDS problem.  The next periapses
will provide more test cases.

Aerobraking is set to resume with an ABM at apoapsis 36.

-Trish