NEAR SHOEMAKER WEEKLY REPORT April 21, 2000 MISSION OPERATIONS: NEAR Shoemaker continued to operate nominally this past week in orbit around the asteroid 433 Eros. NEAR Shoemaker remained in Operational Mode with Flight Computer #1 and Attitude Interface Unit #2 in control of spacecraft attitude. The spacecraft instrument suite remained "ON" and operational this week. NEAR Shoemaker is presently in a nominal 100 km circular orbit around Eros. The spacecraft will remain in this orbit conducting Science observations until April 22, 2000 at 17:50 UTC when Orbit Correction Maneuver 5 (OCM 5) will initiate a 100 km x 50 km transfer orbit. Final burn parameters have been delivered and will be uploaded to NEAR Shoemaker tomorrow (DOY 112). NEAR Shoemaker will remain in the 100 km x 50 km transfer orbit conducting Science observations until April 30, 2000 at 16:55 UTC when Orbit Correction Maneuver 6 (OCM 6) will circularize the orbit at 50 km. Based on the performance of OCM 5, the nominal burn time for OCM 6 will be refined. Science activities conducted this week included Eros observations by the full instrument suite: MSI, NIS, MAG, NLR and XGRS. Please consult science timelines for more details. Upcoming Spacecraft Activities: In addition to regular Eros Science and Optical Navigation, the following are operationally significant activities planned for the NEAR Shoemaker mission operation: April 22 Eros Orbit Correction Maneuver 5 (100 km x 50 km transfer orbit) April 30 Eros Orbit Correction Maneuver 6 (50 km orbit circularization) Debra Debra L Fletcher The Johns Hopkins University Applied Physics Laboratory Bldg.-Rm.: 2-155 11100 Johns Hopkins Road Laurel, MD 20723-6099 240-228-8274/Washington 443-778-8274/Baltimore Fax: 240-228-3237 Email: debra.fletcher@jhuapl.edu