Tue, Jul 06, 2004
Abbreviated Burn Leaves Satellite In Too-Low Orbit
The Sea Launch team is gathering and reviewing Telstar 18
mission data to understand the sequence of events that led to a
premature shutdown of the Sea Launch Zenit-3SL upper stage during
that mission earlier this week.
The Zenit-3SL launch vehicle lifted off from the equatorial
launch site on June 28 at 8:59 pm PDT, (3:59 GMT, June 29) as
scheduled, deploying Loral's Telstar 18 communications satellite
into orbit with a separated mass of 4,640 kg (10,229 lbs.). Based
on preliminary flight data, all Sea Launch system flight parameters
were nominal except that the upper stage of the launch vehicle shut
down about 54 seconds prematurely, following the second of two
planned burns of the upper stage. The early shutdown caused the
satellite to be released into an orbit with an apogee of 21,605 km,
some 14,000 km short of the 35,786 km target apogee.
Space Systems/Loral confirmed spacecraft signal acquisition by a
ground station in Perth, Australia, soon after separation and
reported that the satellite was operating normally. Loral Space
& Communications has replanned the mission and, if successful,
the satellite has sufficient on-board fuel to bring it to its final
orbital position and meet or exceed its 13-year specified life.
Loral also reported the Telstar 18 spacecraft has deployed its
solar arrays and all systems on the spacecraft are functioning as
designed.
The cause of the rocket's upper stage premature shutdown is
under investigation by an Energia-appointed commission. Sea Launch
will also form an independent review board to evaluate all findings
and confirm that any corrective actions associated with the upper
stage performance on the Telstar 18 mission are complete,
satisfactory and verified. At this point in time, Sea Launch is
optimistic it will conclude the board's investigation and complete
two more launches this year, as originally planned. Sea Launch
remains highly confident in the robust capability of the Zenit-3SL
system, including the upper stage. This component remains one of
the premiere upper stages in the industry, with an overall success
rate of approximately 97%.
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