Hubble Rescue
Overview
SkyCorp Incorporated
March 2, 2004
Hubble Rescue SLES Quick Facts
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Dry Mass---~2500 Kilograms
Propulsion--Hall Thruster Ion
Thrust--------5.6 Newtons Max
Isp------------1875 Minimum
Fuel----------Xenon
Fuel Mass--3750 Kg Max
Launch------DIV or On Orbit Assembly
~Cost--------$300M
Launch Date-------2008
Mission Time------Less Than 1 Year
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Inclination Change by EP
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Orbit is like a gyroscope. Thrust 90°
ahead of desired tilt.
Effectiveness is ~ cosine of angular
distance from node.
Thrust 90° from flight path for pure
plane change.
If thrust arc is +/- 45° from node,
effectiveness is 90%, thrusting is half
the time (neglecting shadowing)
A small tilt of thrust vector in direction
of flight will raise orbit altitude. A 1
deg. tilt results in about 4 km altitude
gain for each degree of plane change.
Therefore, altitude profile can be
tailored by small tilts of thrust vector
with almost no effect on plane change
effectiveness.
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Scenario (1) 44 kW and 1500 kg
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Scenario (2) 66 kW and 2000 kg
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Scenario (3) 88 kW and 2500 kg
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