Which is this nice flashing satellite ?

From: alain.figer@club-internet.fr
Date: Wed Mar 14 2012 - 13:39:14 UTC

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    Hi all,
    While expecting ITOS 1 rocket (1970-08C) at its pass close to Capella,  I noticed with binoculars a splendid flashing satellite.
    I took 2 photos of it as it passed about 1°at right of Capella (at UTC 19h45m34s +-3 sec) in a near zenithal pass, but failed to identify it later using Calsky.
    At first glance  I derived these tentative parameters:
    - altitude about 500 km 
    - inclination in the vicinity of 50° or so.  (moving West to East) 
    - flashing period 0.4 sec
    - magnitude 5-6 to invisibility
    It looked very much like a recently launched rocket body.
    Can someone tell me what it is ?
    Alain Figer
    48.67 N ; 2.13 E ; 170 m a.s.l.
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