Re: Kep probs...Geosats.....

From: John locker (satcom@uksysops.com)
Date: Sun Jan 14 2001 - 09:23:17 PST

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    I first found this problem a few days ago and comtacted "Logsat"
    (www.logsat.com) as I thought I must have messed up my software.It was the
    writer of the programme who then suggested it may be the keps
    themselves....and sure enough it looks like he is right.
    
    Question  now  is ....why ?
    
    Any suggestions ?
    
    John.
    
    
    
    Subject: Re: Kep probs...Geosats.....
    
    
    > John is right, at least as far as Astra 1A is concerned.
    > The elset in Alan's Satbase.zip is numbered 317, but the latest 5 on OIG
    are
    > 312 to 316 !
    > A SkyMap run shows that elset 316 does not give a position S of Europe -
    > setting the longitude 140 W I get only elset 316.
    >
    > ASTRA 1A 316
    > 1 19688U 88109B   01009.00000000  .00000036  00000-0  10000-3 0  3164
    > 2 19688   0.0692 105.5984 0009287 283.9205 315.1247  1.00269188 24473
    > ASTRA 1A 315
    > 1 19688U 88109B   00356.50000000  .00000121  00000-0  10000-3 0  3157
    > 2 19688   0.0389  60.3228 0003412 105.0278 124.2361  1.00272002 24287
    > ASTRA 1A 314
    > 1 19688U 88109B   00354.50000000  .00000117  00000-0  10000-3 0  3149
    > 2 19688   0.0389  60.3228 0003412 105.0278 122.2579  1.00272002 24264
    > ASTRA 1A 313
    > 1 19688U 88109B   00347.79658566  .00000128  00000-0  10000-3 0  3139
    > 2 19688   0.0389  60.3228 0003412 105.0278 222.4859  1.00272002 24202
    > ASTRA 1A 312
    > 1 19688U 88109B   00343.98098959  .00000138  00000-0  10000-3 0  3120
    > 2 19688   0.0144 300.1777 0004701 352.6161 157.6224  1.00275263 24160
    > Astra 1A 317        35793 x 35784 km
    > 1 19688U 88109B   01009.00000000  .00000125  00000-0  10000-3 0  3174
    > 2 19688   0.0460   0.0000 0001000   0.0000 127.7508  1.00275562 24470
    >
    >
    >                            TLE file:  C:\TLE\Astra1a.tle
    >                  Configuration file:  C:\TLE\astra1A.CFG
    >                       Tracking site:  5919 Barndalen, Malma, Sweden
    >                            Timezone:   +1.0 hours
    >                        Report times:  Local
    >                            Latitude:  +59.2611
    >                           Longitude:   +18.6192
    >
    >             Start of Track  Peak Elevation     End of Track
    >   Date     Time  Azim Elev   Time  Azim Elev  Time Azim Elev Satellite
    Name
    > -------- -------- --- ----------- ---- --  -------- --- --- --------------
    >  1/ 1/14  8:04:40 178 23  10:43:15 178 23   8:04:40 178 23  ASTRA 1A 312
    >  1/ 1/14  8:04:40 179 23  22:45:46 179 23   8:04:40 179 23  Astra 1A 317
    > 35793 x 35784 k
    >  1/ 1/14  8:04:40 179 23   2:33:09 179 23   8:04:40 179 23  ASTRA 1A 314
    >  1/ 1/14  8:04:40 178 23   2:39:40 178 23   8:04:40 178 23  ASTRA 1A 313
    >  1/ 1/14  8:04:40 179 23   2:40:13 179 23   8:04:40 179 23  ASTRA 1A 315
    >
    >                        Report times:  UTC
    >                            Latitude:  +59.2611
    >                           Longitude:  -140.0000
    > -------- -------- --- ----------- ---- --  -------- --- --- --------------
    >  1/ 1/14  7:04:40 161 21  14:47:33 162 21   7:04:40 161 21  ASTRA 1A 316
    >
    > ----- Original Message -----
    > From: "John locker" <satcom@uksysops.com>
    > To: "Tony Beresford" <aberesford@iprimus.com.au>
    > Cc: "Seesat-L" <SeeSat-L@blackadder.lmsal.com>
    > Sent: Sunday, January 14, 2001 2:52 PM
    > Subject: Re: Kep probs...Geosats.....
    >
    >
    > > Hi Tony,
    > >
    > > Astra 1d should be 28 degs East(Its one of the astra group that is
    located
    > > with the newer birds) ...but it is not affected by the bug....only
    certain
    > > sats sem to be "bugged"
    > > if you take a look at http://www.lyngsat.com you'll see that they are
    > saying
    > > Asta 1a info is unavailable in the tracking section....all very strange.
    > >
    > > Heavens above also locates Astra 1a ( 19688) over the Pacific !
    > >
    > > I am beginning to wonder if this is a bug associated with Y2K+1
    > >
    > >
    > > John
    > >
    > >
    > > > John, I accessed ASTRA 1D 23331 and OPTUS B3 (23227)using the select a
    > > > satellite feature on heavens-above.com . ASTR 1d was sitting at about
    > 30E,
    > > > and OPTUS B3 at 153E like it should, so I dont think its a problem
    > > > with the TLE's. In both cases the TLE's used were the latest available
    > > from OIG
    > > > I think your prediction programme has a bug in it.
    > > > Tony Beresford
    > >
    > > -----------------------------------------------------------------
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    > >
    > >
    >
    
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