From: David S Dubov <David.S.Dubov@jpl.nasa.gov> (by way of Jan Wee <jwee@mail.arc.nasa.gov>)
Subject: Mars Pathfinder Mission Status - 4 February 1997
Date: Tue, 04 Feb 1997 17:11:54 -0600
Dear discuss-lfm members, FYI -- David just posted this news... Jan ***************************************************************** MARS PATHFINDER MISSION STATUS REPORT 4 February 1997 The Mars Pathfinder spacecraft is currently 19 million km (11 million miles) from Earth traveling at 30 km/s on its trajectory to Mars. All spacecraft subsystems continue to operate as expected. At 5:00 PM PST on February 3, we successfully completed our second Trajectory Correction Maneuver. This maneuver was designed to correct errors in the first TCM performed on January 9, and move us closer to our final trajectory. The spacecraft will not be placed on a Mars atmospheric entry trajectory until after TCM-3 (currently scheduled for May 5) because of planetary quarantine requirements. The TCM-2 design team, led by Flight Engineer Guy Beutelschies, developed a two part approach to perform the maneuver. In the first part, the spacecraft fired two of its forward facing thrusters continuously for five minutes. The change in velocity for this "axial" component was about 1.5 m/s. The second part of the maneuver was a smaller velocity correction of 0.1 m/s performed in the "lateral" mode. In this mode, the spacecraft pulses all four thrusters on one side of the spacecraft for five seconds. This pulse causes a small change in the spacecraft velocity in the direction perpendicular to the spacecraft spin axis. This mode will be used for all future maneuvers, so TCM-2 was a good proof-of-concept test. Early analysis of tracking data from NASA's Deep Space Network indicates that both components were completed successfully. Upon completing the maneuver, the spacecraft's spin axis was turned 15 degrees back toward Earth so that we can perform radio navigation more effectively. The spacecraft is currently pointed about 5 degrees from Earth and 2 degrees from the Sun. We will remain in this attitude until late March. The spacecraft will remain in a relatively quiescent mode for the next two to three months. The flight team is currently working hard to complete planning for Mars entry and surface operations. For more information, please visit our website at http://mpfwww.jpl.nasa.gov.