Astra 1K raised

From: Alan Pickup (alan@wingar.demon.co.uk)
Date: Wed Nov 27 2002 - 03:45:31 EST

  • Next message: Greg Roberts: "Obs USA 125 26 Nov 2k2"

    This morning's confusing set of elsets for _both_ Astra 1K and its Blok 
    DM rocket can be explained by Astra 1K (presumably) being raised 
    slightly in orbit and by SCC switching the identities of the two 
    objects.
    
    The elsets in question are:
    
    Astra 1K                                         186 x 171 km
    1 27557U 02053A   02330.87125512  .01703153  12238-4  21124-3 0    89
    2 27557  51.5660  55.0293 0011458 166.9008 193.2291 16.35113724   150
    Astra 1K                                         299 x 146 km
    1 27557U 02053A   02331.11564909  .02480973  11829-4  20809-3 0    92
    2 27557  51.5938  53.6192 0115872 298.2794  62.4379 16.18854523   194
    
    Astra 1K Blok DM3 r                              171 x 156 km
    1 27558U 02053B   02330.86929521  .04524269  12437-4  28286-3 0   136
    2 27558  51.5799  54.9868 0011817 279.3691  80.7592 16.40899035   152
    Astra 1K Blok DM3 r                              182 x 170 km
    1 27558U 02053B   02331.11270232  .01847656  12266-4  20681-3 0   140
    2 27558  51.5657  53.6699 0009304 169.9036 173.0733 16.36137037   197
    Astra 1K Blok DM3 r                              181 x 168 km
    1 27558U 02053B   02331.23771567  .02065705  12280-4  21552-3 0   153
    2 27558  51.5642  52.9688 0009408 166.3803 193.7479 16.36758949   219
    
    What was previously ID'd as Astra 1K is now the Blok DM, correctly 
    represented by the final two elsets above. It appears that Astra 1K was 
    raised from a 171 x 156 km orbit (the first of the Blok DM ones above) 
    to a 299 x 146 km orbit (the second of the Astra 1K elsets) between Nov 
    26.869 and Nov 27.116. Presumably a COLA analysis could pin down the 
    time.
    
    The following is taken from my updated Decay Watch page:
    _____________________________________________________________________
    Object: #27558 = 02- 53 B = Astra 1K Blok DM3 r
    
    Decay predictions since identity swap with #27557:
    Source   Prediction made    Predicted decay at      Latitude Longitude
                    UTC                UTC                  deg      deg
    SCC        (None since identity switch)
    SatEvo     Nov 27 08:40     Nov 28 14:08 +-9h
    
    Latest elset:
    Astra 1K Blok DM3 r                              181 x 168 km
    1 27558U 02053B   02331.23771567  .02065705  12280-4  21552-3 0   153
    2 27558  51.5642  52.9688 0009408 166.3803 193.7479 16.36758949   219
    
    SatEvo prediction:
    Astra 1K Blok DM3 r                              175 x 163 km
    1 27558U 02053B   02331.54274561  .03320762  87746-2  27158-3 0 90151
    2 27558  51.5637  51.2470 0008590 167.6712 192.3498 16.38850938   262
    Astra 1K Blok DM3 r                              169 x 159 km
    1 27558U 02053B   02331.78651399  .04142802  14304-1  27260-3 0 90156
    2 27558  51.5632  49.8674 0007810 168.7056 191.3119 16.40653738   309
    Astra 1K Blok DM3 r                              162 x 153 km
    1 27558U 02053B   02332.02997861  .05627611  29031-1  25088-3 0 90157
    2 27558  51.5625  48.4856 0006844 169.7418 190.2721 16.42991121   341
    
    Note: The earlier elsets for this object were issued under the guise of
    Astra 1K, #27557.
    _____________________________________________________________________
    
    
    Alan
    -- 
    Alan Pickup / COSPAR 2707:  55.8968N   3.1989W   +208m   (WGS84 datum)
    Edinburgh  / SatEvo & elsets:    http://www.wingar.demon.co.uk/satevo/
    Scotland  / Decay Watch: http://www.wingar.demon.co.uk/satevo/dkwatch/
              *
    
    
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