suivi des satellites artificiels

07 mai 2008



On march 2008, we computed the spells of visibility and the unusual movement of perigee of USA 193(the argument of perigee had been kept ~100° to destroy more easily that satellite).
On April, with the last two line elements, we computed the last positions of the satellite.
The last TLE epoch are 12.4 H TU on 21 February 2008.
RAAN 26.1°
Arg perigee 100.08°

Mean anomaly 260.14. So (100+260=360°), the satellite is on the ascending node ie latitude=0°
The sidereal time of Greenwich at that epoch is 339° so the longitude is
360-339+26.1=47.1 east  or 313°.
We see too that, during that spell of visibility, the transits are ascending.
With that point of reference we computed the time of the first  transit near the latitude of Auffargis ~50°.
We found .25 hour after 12.4H and we computed  the positions two orbits after two orbits (~3 hours).
Finally we got that USA 193 transited over Dunkerque in FRANCE (lat 51.2/lo. 358°) at 6.24+12.4=18.64 TU on 21 February 08 and over Hawai at 15.05+12.4=27.45=3.45 or 3h 27mn TU.
It has been destroyed 6 revolutions after its transit over FRANCE. The debris may have been seen from CANADA. Their height are over 400 Kms and could transit around Earth over a year with the same inclination 58/59°.

From the curve speed versus anomaly we saw that V of the satellite was ~27900 kms/H compared to V missile~ 8000 kms/H. To hit successfully that satellite has really been a feat though the trajectory was well known before.

Posté par revosat à 01:18 - Observation - Commentaires [3] - Permalien [#]


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