Re: Decay watch: Apr 9

Alan Pickup (alan@wingar.demon.co.uk)
Sat, 10 Apr 1999 08:48:12 +0100

I wrote
>...
>---------------------------------------------------------------------
>Object: #25670 = 99- 17 B = DSP 19 Titan 4 r
>
>Decay predictions:
>Source   Prediction made    Predicted decay at      Latitude Longitude
>               UTC                UTC                  deg      deg
>
>SatEvo     Apr  9 22:30     Apr 10 18:00 ?
>
>Latest elset:
>DSP 19 Titan 4 r                                 757 x 190 km
>1 25670U 99017B   99099.69590815  .23901670 -50262-5  32105-1 0    10
>2 25670  28.6482 276.1523 0413879  73.9983 290.7631 15.30789974    00
>
>Note: This is the first elset for this newly launched object. The
>prediction is very uncertain, being based entirely on the high and
>possibly erroneous drag rate above.
>---------------------------------------------------------------------

OIG are reporting the satellite's name as USA 142. The latest (of three)
elsets for this rocket reads:
DSP 19 Titan 4 r                                 743 x 189 km
1 25670U 99017B   99100.15157662  .00358508 -54120-5  46417-3 0    36
2 25670  28.6319 273.0251 0404647  78.8743 285.6917 15.33214674    63

This has a more realistic drag value (0.00358508) which agrees well with
an evolution through the positions at the earlier elsets. Far from
decaying today, April 10, this should be around until June.

Alan
-- 
 Alan Pickup | COSPAR 2707:   55d53m48.7s N   3d11m51.2s W   156m asl
 Edinburgh   | Home:   alan@wingar.demon.co.uk    +44 (0)131 477 9144
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