PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
 PUBLICATION_DATE     = 2007-07-29
 NOTE                 = " E-mail and other messages
                          concerning MGS Radio Science on
                          or about 2000/068."
END_OBJECT            = TEXT
END


From trish@rodan.jpl.nasa.gov Wed Feb  9 15:19 PST 2000
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Date: 09 Feb 00 15:21:11 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Beta-Supplement and Fixed HGA
To: Salvadore Abbate <Salvatore.F.Abbate@jpl.nasa.gov>,
        Georges Balmino <balmino@pontos.cnes.fr>,
        Pat Esposito <pesposit@mail1.jpl.nasa.gov>,
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Hello,

As you probably know, the beta-supplement mode of operations began during
the Madrid pass on Monday morning (038/09:55:00 UTC ERT, orbit 4105).
This has two main implications for Radio Science:  (1) we will not be able
to acquire egress measurements during beta-supplement mode, and (2) there
will be approximately 16 minutes of tracking data outage during each orbit
while the HGA rewinds.

In order to obtain some egress measurements, there will be four to eight
days per month of fixed-HGA operations.  During these periods, the
spacecraft will be NADIR pointed for 12 orbits (no downlink) followed by 4 orbits
with the HGA fixed and Earth-pointed (no NADIR observations).  The
fixed-HGA mode is very similar to the previous fixed-HGA periods which occurred
both before Mapping and right after the HGA AZ gimbal anomaly.

The fixed-HGA periods for March are as follows (in UTC ERT):

066/03:35 to 066/11:35
067/11:35 to 067/19:35
068/19:35 to 069/03:35

075/11:30 to 075/19:30
076/19:30 to 077/03:30
077/03:30 to 078/11:30

I will keep you informed of future fixed-HGA periods.

-Trish

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From rsimpson Sun Mar  5 09:27 PST 2000
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Date: Sun, 5 Mar 2000 09:27:47 -0800 (PST)
From: Dick Simpson 723-3525 <rsimpson>
Message-Id: <200003051727.JAA20645@magellan.stanford.edu>
To: flemoine@ares.gsfc.nasa.gov, rsimpson
Subject: Tracking
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Frank:

  In case you need it in the future, you might note that we are in
te midst of a period of thin MGS tracking coverage.

  Between DSS 25 end of track 2000/065T03:35:00 and DSS 25 begin
track 2000/066T01:35:00, there is no coverage

  Between DSS 65 end of track 2000/066T13:35:00 and DSS 54 begin
track 2000/067T11:35:00, there is no coverage.

  Between DSS 25 end of track 2000/067T19:35:00 and DSS 15 begin
track 2000/068T17:35:00 there is no coverage.

  Coverage is then quite good for the next week, then there are
a couple gaps of 22 nd 24 hrs.

Dick

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Date: Sun, 5 Mar 2000 22:04:46 -0800 (PST)
From: Dick Simpson 723-3525 <rsimpson>
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To: flemoine@ares.gsfc.nasa.gov, rsimpson, trish@rodan.jpl.nasa.gov
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If I'd been thinking a little more about the big picture when I sent
you the list of tracking gaps in the next couple weeks, I would have
remembered this is when we do Fixed HGA Mapping.  So there was a
very good reason for these gaps.

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From ppriest@airmail.fltops.jpl.nasa.gov Wed Mar  8 18:59 PST 2000
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Date: Thu, 9 Mar 2000 03:00:11 GMT
From: Patricia Priest <ppriest@airmail.fltops.jpl.nasa.gov>
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Orbit:     4476e
SOE: mm020a.03.tsoe
Begin Record: 068/17:33:00
End Record: 068/17:42:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit:     4476i
SOE: mm020a.03.tsoe
Begin Record: 068/18:49:00
End Record: 068/18:58:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4477e
SOE: mm020a.03.tsoe
Begin Record: 068/19:31:00
End Record: 068/19:40:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4477i
SOE: mm020a.03.tsoe
Begin Record: 068/20:47:00
End Record: 068/20:56:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4478e
SOE: mm020a.03.tsoe
Begin Record: 068/21:29:00
End Record: 068/21:37:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4478i
SOE: mm020a.03.tsoe
Begin Record: 068/22:45:00
End Record: 068/22:53:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4479e
SOE: mm020a.03.tsoe
Begin Record: 068/23:26:00
End Record: 068/23:35:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4479i
SOE: mm020a.03.tsoe
Begin Record: 069/00:42:00
End Record: 069/00:51:00
Last Attenuation Change:
SNT:
Elevation Angle:

Orbit: 4480i
SOE: mm020a.03.tsoe
Begin Record: 069/02:40:00
End Record: 069/02:48:00
Last Attenuation Change:
SNT:
Elevation Angle:

--------------------------------------------------------------------------
From trish@rodan.jpl.nasa.gov Wed Mar  8 09:51 PST 2000
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Date: 08 Mar 00 09:53:50 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Extra One-Way
To: Richard Simpson <rsimpson@magellan.stanford.edu>,
        Joe Twicken <joe@neptune.stanford.edu>
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Hello, Dick and Joe,

The first orbit of this fixed-HGA session is one-way because it was just
at the beginning of track (uplink, RTLT, etc.), so we are collecting a bit
over 45 minutes of extra one-way.  TLM will be on, though.

-Trish

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From trish@rodan.jpl.nasa.gov Thu Mar  9 09:43 PST 2000
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Date: 09 Mar 00 09:45:48 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Re: Extra One-Way
To: "Dick Simpson 723-3525" <rsimpson@magellan.stanford.edu>
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         Reply to:   Re: Extra One-Way

>  Do you have times?  Your e-mail starts with 4476e, which looks like
>  beginning of track on my DSN schedule.  Thanks.
>

Extra one-way was 068/17:47:00 to 18:35:00.  There was an attenuation
change at 17:47:08, and we received a circular buffer error at 18:04:00
(possible sawtooth).

>  Also, 4480e was missing from the e-mail.  Was the spacecraft back on
>  Beta Supplement by then?

Yes.

Also, due to large MOLA temperature gradients, we will not be doing the
second fixed-HGA period next week.  The spacecraft team has to find a
spacecraft attitude which is safe for all instruments before next month's FHGA.

-Trish

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From joe@neptune.stanford.edu Tue Apr 11 15:44 PDT 2000
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From: Joe Twicken <joe@nova.stanford.edu>
To: hinson@nova.stanford.edu, rsimpson@nova.stanford.edu,
        joe@nova.stanford.edu
Subject: RE: ODR Notice: /users/z19/procODR/01022203
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(1) There are small frequency spurs at +/- 120 Hz in these recordings

(2) There was no HGA motion compensation for these recordings

On 11-Apr-00 Joe Twicken 723-3597 wrote:
> 00681733.ODR p 15XRXER1R201 15XRXEC1XX01 15XR1EF1S101 15XR1ES1T101
> 15XR1ES1T201 15XR1ES1T301 15XR1ES1T401 15XR1ES1T501
> 00681849.ODR p 15XRXIR1R201 15XRXIC1XX01 15XR1IF1S101 15XR1IS1T101
> 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501
> 00681931.ODR p 15XRXER1R201 15XRXEC1XX01 15XR1EF1S101 15XR1ES1T101
> 15XR1ES1T201 15XR1ES1T301 15XR1ES1T401 15XR1ES1T501
> 00682047.ODR p 15XRXIR1R201 15XRXIC1XX01 15XR1IF1S101 15XR1IS1T101
> 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501
> 00682129.ODR p 15XRXER1R201 15XRXEC1XX01 15XR1EF1S101 15XR1ES1T101
> 15XR1ES1T201 15XR1ES1T301 15XR1ES1T401 15XR1ES1T501
> 00682245.ODR p 15XRXIR1R201 15XRXIC1XX01 15XR1IF1S101 15XR1IS1T101
> 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501
> 00682326.ODR p 15XRXER1R201 15XRXEC1XX01 15XR1EF1S101 15XR1ES1T101
> 15XR1ES1T201 15XR1ES1T301 15XR1ES1T401 15XR1ES1T501

--------------------------------------------------------------------------
From joe@neptune.stanford.edu Fri Sep 21 17:55 PDT 2001
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From: Joe Twicken <joe@nova.stanford.edu>
To: joe@nova.stanford.edu, rsimpson@magellan.stanford.edu,
        hinson@nova.stanford.edu
Subject: RE: ODR Notice: /users/z19/procODR/12650010
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(1) Reprocessed with Goddard (ql15) trajectory. The orbit reconstruction was
    marginal for the 00681733.ODR recording

(2) There was no HGA motion compensation for any of these recordings

On 22-Sep-01 Joe Twicken 723-3597 wrote:
> 00681733.ODR p 15XRXER1R202 15XRXEC1XX02 15XR1EF1S102 15XR1ES1T102
> 15XR1ES1T202 15XR1ES1T302 15XR1ES1T402 15XR1ES1T502
> 00681849.ODR p 15XRXIR1R202 15XRXIC1XX02 15XR1IF1S102 15XR1IS1T102
> 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502
> 00681931.ODR p 15XRXER1R202 15XRXEC1XX02 15XR1EF1S102 15XR1ES1T102
> 15XR1ES1T202 15XR1ES1T302 15XR1ES1T402 15XR1ES1T502
> 00682047.ODR p 15XRXIR1R202 15XRXIC1XX02 15XR1IF1S102 15XR1IS1T102
> 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502
> 00682129.ODR p 15XRXER1R202 15XRXEC1XX02 15XR1EF1S102 15XR1ES1T102
> 15XR1ES1T202 15XR1ES1T302 15XR1ES1T402 15XR1ES1T502
> 00682245.ODR p 15XRXIR1R202 15XRXIC1XX02 15XR1IF1S102 15XR1IS1T102
> 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502
> 00682326.ODR p 15XRXER1R202 15XRXEC1XX02 15XR1EF1S102 15XR1ES1T102
> 15XR1ES1T202 15XR1ES1T302 15XR1ES1T402 15XR1ES1T502