Fragmentation of 99057C

From: Eberst (
Date: Sun Apr 09 2000 - 11:30:49 PDT

  • Next message: Ted Molczan: "RE: Fragmentation of 99057C"

    There is further evidence that many fragments have appeared in orbit
    due to the disintegration of 99-57C #25942.  The evidence is found in the
    already published elements for 99-57D #26112 (see below). This seems to be
    the first object from the break-up to have its orbit published.  
    It appears to have been ejected 'backwards', that is in a direction opposite 
    to its velocity vector, thus reducing its perigee height to around 260 km.
    Low perigee meant that it experienced very high atmospheric drag, as seen in
    the orbit given below. This drag has rapidly reduced apogee height from the
    original 730 km or so to 568 km. by day 00085.16161.  Note also that the
    epoch revolution is given as 158. Making about 15 revs/day, it would take
    about 10.5 days to reach rev# 158.  So the indications are that 99-57D
    appeared and was tracked from about day 00074.7
    UNK                                              568 x 259 km
    1 26112U 99057D   00085.16161085  .02563673  23680-2  14609-1 0    22
    2 26112  98.5438 163.6717 0227351 340.5234  18.7433 15.51033272  1582
    Along with the many sightings reported to Seesat, of several objects, this
    announced object would lead me to expect that dozens/scores of further
    fragments will have their orbits made available, hopefully in the near future.
    best wishes
    Russell  Eberst  @   North: 55 degrees, 56 minutes, 55 seconds:
    West:  3 degrees, 8 minutes, 18 seconds: 
    43metres (150 feet) above sea-level.      177519 Observations   
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