DFH-3 Rkt Flashing & SGP4 thoughts

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A.    While watching Superbird A  on 21 Mar 97 UT I noticed another 
slow-moving flasher moving through the field of view.   Later check
with Skymap indicates it was DFH-3 RB, #23416, 94-080 B.  It was 
much closer to perigee than apogee and was visible in 50 mm binocs.
Period was not determined due to concentration on Superbird.


B.    I am excited about Rob Matson's implementation of SDP for Skymap.
I have used Skymap and SGP4 to view Molniya satellite (eccentric).  
Seems to me that near to epoch, times were ok, but using older elsets
I would get a minute or more time error.    Bjoern mentioned that SGP4
is not suited for this type orbit.

Is this a manifestation of his statement?  Also I assume that SDP would 
work better with Molniya's and older elsets much as Rob's recent test
with Superbird A.

Ron Lee

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