Re: CZ-4C DEB 36417 Flares while in shadow - is this common ?

From: Björn Gimle (bjorn.gimle@gmail.com)
Date: Thu Sep 13 2012 - 13:39:38 UTC

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    2012/9/13 joseph daniel <station969@hotmail.com>
    
    >
    > ...
    > hit the hot-key . However , time accuracy in this case isn't so critical .
    > I spotted it in
    > an area that was still (supposedly) in shadow ...
    > ...at the altitude of this fragment - not the area itself.
    >
    
    
    >  The best-guess , for me , might be a UNID perhaps , that may have an odd
    > , maybe deep
    > orbit that may have taken it out of shadow . However , that is a very ,
    > very deep
    >
    > This would be most likely! SkyMap also reports this piece in shadow at
    1613 km range, thirty other objects within +-8 min and 5 deg are closer.
    The closest ones sunlit in the area within +-8 min are at ~1700 km, some
    debris objects entering shadow about ten degrees left.
    
    >  However, regarding your last question, the space-track (NORAD) common
    names are not unique.
    >  While in-tact satellites have unique names, rocket bodies and debris do
    not.  The rocket
    >  bodies are named by class (CZ-4C is a designation for a Chinese Long
    March 4C).  Debris is
    >  named after the source body name with deb appended.  For the case of
    rocket bodies, it's
    >  therefore possible for debris from different sources to have the same
    common name.  The
    >  international designation can tell you which objects are associated with
    the same launch.
    
    Well, not only DEBris from rocket bodies - the rockets themselves exist in
    multiples.
    There are six CZ-4C R/B, and e.g. 429 SL-8 R/B in the full catalog (295
    still in orbit).
    Also DEBris from COSMOS 2251, IRIDIUM 33, FENGYUN 1C
    (these are the most notable, many other satellites have one to dozens of
    debris).
    
    /Björn
    
    -- 
    ----------------------------------------
    Björn Gimle, COSPAR 5919
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