Subject: mirnews.424
From: "C.M. vd Berg" <[email-masked]>
To: Multiple recipients of list <[email-masked]>
Date: Wed, 3 Jun 1998 10:30:53 -0400 (EDT)

Dit is een meerdelig bericht in MIME-indeling.

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MIRNEWS.424                                                              =
                3 JUNE 1998

STS-91, Discovery. Start 2.06.1998 2206UTC.=20

Planned docking time at MIR: 4.06.1998 at 1659UTC.=20

(For Western Europe): During the final stage of the approach of =
Discovery to MIR both objects will be in our range during MIR=92s orbit =
70210, 1649-1657UTC.=20

Then radiotraffic might be possible on the following channels: 143.625 =
mc (MIR-TsUP Moscow), 130.165 mc (MIR-Discovery) and 121.750 mc (not =
likely).=20

Traffic from MIR via Altair-2 with TV-images of the approaching Shuttle =
are also possible during that orbit between 1613 and 1707UTC if this =
satellite will be used for that purpose.=20

And there is a chance that images from the Shuttle of the MIR complex =
via a TDRS and relayed by CNN reach us if the editors do not attach a =
higher priority to other subjects.=20

Attitude control problems solved:

During the period in which the MIR crew was solving these problems the =
attitude control was done by small thrusters of the MIR complex itself =
and Soyuz-TM27. The replacement of the attitude control computer by a =
new or by an old spare one did not help. TsUP transmitted to MIR the =
needed software. After loading this into the computer the word =
=91error=92 appeared on the screen. After the replacement of the Omega =
startracker in the Kristall module or switching over to a reserve one =
the attitude control was activated again and worked well.=20

In the morning of 2.06.1998 the Russians successfully concluded the =
necessary tests and they started to activate the 11 gyrodynes. In the =
course of 2.06.1998 all gyrodynes=20

spinned at their maximum speed thus securing the accurate attitude =
control badly needed for the approach and docking of Discovery on =
4.06.1998. Moreover Russian experts had stated that approach and docking =
also were possible when the attitude control was done by thrusters, but =
thusfar this had not been necessary during previous Shuttle operations =
and consequently this has never been tried out.=20

During the period in which the crew was repairing and testing the =
attitude control systems radiotraffic could be monitored far into the =
night. During these communications Musabayev got commands from TsUP and =
loaded these into the systems Svet and Simvol.=20

Altair-2: A considerable time there were no communications via this =
geostationary satellite. This is quite normal in periods in which the =
attitude cannot be maintained by the gyrodynes.=20

Chris van den Berg, NL-9165/A-UK3202.=20

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<P>MIRNEWS.424&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
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sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
3 JUNE 1998</P>
<P>STS-91, Discovery. Start 2.06.1998 2206UTC. </P>
<P>Planned docking time at MIR: 4.06.1998 at 1659UTC. </P>
<P></P>
<P>(For Western Europe): During the final stage of the approach of =
Discovery to=20
MIR both objects will be in our range during MIR&rsquo;s orbit 70210,=20
1649-1657UTC. </P>
<P>Then radiotraffic might be possible on the following channels: =
143.625 mc=20
(MIR-TsUP Moscow), 130.165 mc (MIR-Discovery) and 121.750 mc (not =
likely). </P>
<P>Traffic from MIR via Altair-2 with TV-images of the approaching =
Shuttle are=20
also possible during that orbit between 1613 and 1707UTC if this =
satellite will=20
be used for that purpose. </P>
<P></P>
<P>And there is a chance that images from the Shuttle of the MIR complex =
via a=20
TDRS and relayed by CNN reach us if the editors do not attach a higher =
priority=20
to other subjects. </P>
<P></P>
<P>Attitude control problems solved:</P>
<P>During the period in which the MIR crew was solving these problems =
the=20
attitude control was done by small thrusters of the MIR complex itself =
and=20
Soyuz-TM27. The replacement of the attitude control computer by a new or =
by an=20
old spare one did not help. TsUP transmitted to MIR the needed software. =
After=20
loading this into the computer the word &lsquo;error&rsquo; appeared on =
the=20
screen. After the replacement of the Omega startracker in the Kristall =
module or=20
switching over to a reserve one the attitude control was activated again =
and=20
worked well. </P>
<P>In the morning of 2.06.1998 the Russians successfully concluded the =
necessary=20
tests and they started to activate the 11 gyrodynes. In the course of =
2.06.1998=20
all gyrodynes </P>
<P>spinned at their maximum speed thus securing the accurate attitude =
control=20
badly needed for the approach and docking of Discovery on 4.06.1998. =
Moreover=20
Russian experts had stated that approach and docking also were possible =
when the=20
attitude control was done by thrusters, but thusfar this had not been =
necessary=20
during previous Shuttle operations and consequently this has never been =
tried=20
out. </P>
<P>During the period in which the crew was repairing and testing the =
attitude=20
control systems radiotraffic could be monitored far into the night. =
During these=20
communications Musabayev got commands from TsUP and loaded these into =
the=20
systems Svet and Simvol. </P>
<P>&nbsp;</P>
<P>Altair-2: A considerable time there were no communications via this=20
geostationary satellite. This is quite normal in periods in which the =
attitude=20
cannot be maintained by the gyrodynes. </P>
<P></P>
<P>Chris van den Berg, NL-9165/A-UK3202. </P></DIV></BODY></HTML>

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