SV: The chase is on

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 On Mar.10, Robert Reeves <rreeves@connecti.com> wrote :

>Has anyone noticed the dance in the evening sky that the equally bright
>(around mag 2.5) Cosmos 1833 and 2227 rocket bodies are doing the next  =20
few days?

I was too busy to note this in advance, but I try to remember to predict  =20
these events.
These two Zenith rockets are in similar orbits in almost the same plane.  =20
Another pair
is NORAD #16182/19650, and other kinds are #07350/15360, and  =20
#21088/21667.

I use Rob Matson's COLA.EXE to find these close encounters. Running with  =20
recent
elsets, I have :

Mar.10 17590/22285 (2.6 km at 10:26:38 UT)
Mar.21 07350/21667  not co-planar!
Apr.02 21088/21667
Apr.05 16182/22285  not co-planar!
Apr.30 07350/21667  not co-planar!
May.01 17590/22285
May.06 07350/15360
May.08 16182/19650
Jun.02 21088/21667
Jun.09 17590/19650  not co-planar!
Jun.10 07350/21667  not co-planar!
Jul.02 16182/17590  not co-planar!

The predictions involving 16182, 19650, 17590 and 22285 are
less accurate, since they are in 14th order resonance with the
gravitational field ( I should have used smaller "drag" terms )


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