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Lunar Prospector Status Report #38

June 26, 1998 - 1:00 p.m. EST (10:00 a.m. PST)

A Mapping Orbit Correction (MOC) was performed yesterday to maintain the mapping orbit. On DOY 176, at 2142 GMT, the orbit periapsis altitude was raised from 83 km to 109 km using a 39.2 second burn of the A3/A4 thrusters. At 2246 GMT, the A3/A4 thrusters were fired again for 38.5 seconds to lower apoapsis altitude from 118 km to 90 km. At 2323 GMT, thruster T2 was fired for 0.48 seconds to reduce the spin rate from 12.128 rpm to 12.01 rpm. Analysis from the orbit determination team shows that the maneuvers went very well. The next MOC burn is expected to occur in about 2 months. A total of 37 commands were sent to execute these >maneuvers.

Current spacecraft state (0000 GMT 6/26/98):

Orbit: 2008
Downlink: 3600 bps
Spin Rate>: 12.01 rpm

Spin Axis Attitude (ecliptic):
Latitude: 86.3 deg
Longitude: 110 deg

Trajectory:
Periapsis Alt: 90.0 km
Apoapsis Alt: 110.0 km

Inclination: 89.9 deg
Period: 118 min
Occultations: none
Eclipses: none