Xref: utzoo sci.space:27547 sci.astro:11594
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke
From: baalke@mars.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space,sci.astro
Subject: Pioneer 11 Update - 02/08/91
Keywords: Pioneer 11
Message-ID: <1991Feb8.210548.11065@jato.jpl.nasa.gov>
Date: 8 Feb 91 21:05:48 GMT
Sender: news@jato.jpl.nasa.gov
Reply-To: baalke@mars.jpl.nasa.gov (Ron Baalke)
Organization: Jet Propulsion Laboratory, Pasadena, CA.
Lines: 25
Nntp-Posting-Host: mars.jpl.nasa.gov


                      PIONEER 11 STATUS REPORT
                        February 8, 1991
 
     Another unsuccessful attempt to switch receivers on the Pioneer 11
spacecraft was made on February 1.  There were no command rejects.  The power
sharing plan implemented on February 1 (HVM and TRD on) will remain in effect
for February and March 1991.
 
     Work is continuing to develop a method to determine the spacecraft
pointing attitude (no attitude has been obtained since the receiver failure).
On January 9 an IPP (Imaging Photopolarimeter) procedure will be transmitted
which will obtain the the roll and cone angles of Sirius and Canopus.  If
sufficient data is obtained, the intersection of the two cone angles may be
used to determine the attitude.
 
     From February 9 to 10, the spacecraft will be placed in format C
(engineering) to increase the sample rate of the telemetered receiver lock
status.  This will help determine the accuracy of the uplink predicts.
      ___    _____     ___
     /_ /|  /____/ \  /_ /|      Ron Baalke         | baalke@mars.jpl.nasa.gov
     | | | |  __ \ /| | | |      Jet Propulsion Lab | 
  ___| | | | |__) |/  | | |___   M/S 301-355        | It's 10PM, do you know
 /___| | | |  ___/    | |/__ /|  Pasadena, CA 91109 | where your spacecraft is?
 |_____|/  |_|/       |_____|/                      | We do!