Subject: [SLR-Mail] No. 626: Update Preliminary CHAMP Orbit Predictions
From: Roland Schmidt, Rolf Koenig, GFZ <Roland Schmidt <rschmidt@gfz-potsdam.de>>

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SLR Electronic Mail          2000-07-05 08:51:00 UTC           Message No. 626 
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Author: Roland Schmidt, Rolf Koenig, GFZ
Subject: Update Preliminary CHAMP Orbit Predictions

Dear colleagues,

as announced in SLRMail No 0606 the set of preliminary orbit prediction 
products has been updated today (July 4, 2000). This new set of CHAMP 
orbit prediction products represents the nominal CHAMP orbit.

o The data sets are accessible via anonymous ftp at our ftp-server:

          ftp-server name: ftp.gfz-potsdam.de

          Directory: pub/champ/chftp1/slr

          Files: champ_irvs_000704_0.gfz, champ_drag_000704_0.gfz,
                 champ_sao_000704_0.gfz, champ_tle_000704_0.gfz

  The file naming convention has been fixed as follows:

               champ_irvs_<yymmdd>_<c>.gfz   (Tuned InterRangeVectors (IRVs))
               champ_drag_<yymmdd>_<c>.gfz   (adjacent drag functions)
               champ_sao_<yymmdd>_<c>.gfz    (SAO-elements)
               champ_tle_<yymmdd>_<c>.gfz    (Twoline elements)

     where:  <yymmdd> ... ordinary date of dissemination (2-digit year number)
                  <c> ... cycle number indicating c-th update at dissemination
                          day. Initial files would start with c = 0, first update
                          c = 1 and so on.

  The files will also be accessible at the ILRS data centers (CDDIS, EDC) using  
  identical file naming conventions. 

      CDDIS: ftp://cddisa.gsfc.nasa.gov/pub/predicts/2000/champ
      EDC:   ftp://ftp.dgfi.badw-muenchen.de/pub/laser/predictions/CHAMP_PRED 


o The product files contain the following values for CHAMP&#180;s satellite identification
  numbers:

        COSPAR-No.: 0009901 (temporary, until assignment after launch)
        NORAD-TLE : 00099   (temporary, until assignment after launch)
        SIC-No.   : 8002    (fixed)

  Please note, that the preliminary COSPAR-No. used at GFZ is different from the preliminary
  COSPAR-No. announced by Mike Pearlman in SLRMail No. 0624 (0099999). We kindly ask to use
  the preliminary GFZ-COSPAR-No. 0009901 for ONP data to ease operational procedures in the
  initial phase until all satellite identification numbers for CHAMP are assigned.


In case of any questions and/or suggestions please feel free to contact us under

	rolf.koenig@gfz-potsdam.de

Best regards

Roland Schmidt
Rolf Koenig

From: Roland Schmidt <rschmidt@gfz-potsdam.de> 

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