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Phase 3D Estimated Orbital Data



Below is the estimated State Vector and Keplerian Elements for 
the AMSAT Phase 3D spacecraft.  The vector data was computed from 
Arianespace orbital parameters at the time Phase 3D is scheduled 
to separate from the Ariane 5 upper stage.  The Keplerian Elements 
were computed, in turn, from the vector.  

Vector format = 10107
Satellite Name:         Phase 3D
Catalog Number:         93400            
Epoch MET:                  0.02896990700
                           0/00:41:43.000 MET
EFG E:                        6252.236120 km
    F:                        5149.974174 km
    G:                        -641.751706 km
    Edot:                     -2.65855591 km/s
    Fdot:                      8.08211797 km/s
    Gdot:                     -0.94209054 km/s
ndot/2 (drag):              0.00000001545 rev/day^2
nddt/6:                       0.00000E+00 rev/day^3
Bstar:                        2.51416E-05 1/Earth Radii
Elset #:                                1
Rev @ Epoch:                1.50414245998

Launch Window Opens:  2000-NOV-15 / 0107 UTC
Phase 3D separation:  Launch + 0041:43

The following Keplerian elements were computed from this vector and 
the scheduled date and time of the launch window opening.  Updated 
Keplerian elements will be computed from the vector, based on changes 
to the scheduled or actual launch time.

Phase 3D    
1 93400U          00320.07549769  .00000002  00000-0  25142-4 0    12
2 93400   6.5000 257.0516 7357001 175.9721   5.5347  2.02548574    12

Satellite: Phase 3D    
Catalog number: 93400
Epoch time:      00320.07549769
Element set:       1
Inclination:        6.5000 deg
RA of node:       257.0516 deg
Eccentricity:    0.7357001
Arg of perigee:   175.9721 deg
Mean anomaly:       5.5347 deg
Mean motion:    2.02548574 rev/day
Decay rate:    1.54500e-08 rev/day^2
Epoch rev:               1
Checksum:              252

Note that "93400" is a temporary Catalog Number.  A Permanent Catalog
Number and International Designator will be assigned when Phase 3D is
launched.  The satellite name will also be updated with the next 
sequential "OSCAR" designator.

These Keplerian elements represent a pre-launch estimate of Phase 3D's 
initial orbit.  The orbit will change significantly over the first year 
the spacecraft is on orbit.  Updates will be provided for significant 
orbital changes.

Ken Ernandes, N2WWD
n2wwd@amsat.org
http://www.mindspring.com/~n2wwd


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