Accession Number:

AD0752250

Title:

Design of a Solar Ephemeris Synthesizer for LES-8/9

Descriptive Note:

Technical note

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Srivastava, Sushanta

Report Date:

1972-10-12

Pagination or Media Count:

42.0

Abstract:

The various design considerations of a solar ephemeris synthesizer for the LES-89 stationkeeping system are discussed. Different approximations are used to reduce the amount of hardware required for building the synthesizer. The overall accuracy of the synthesizer is about 0.01 deg for orbits inclined up to 5.0 deg from the ecliptic plane. For orbits inclined at greater angles up to 10 deg, the short term accuracy is 0.01 degday and the long term accuracy is about 0.05 degyear. A few ephemerides generated by the synthesizer are graphically illustrated.

Descriptors:

• *ORBITS
• *SATELLITE ATTITUDE
• *SYNCHRONOUS SATELLITES
• ANOMALIES
• SUN
• EPHEMERIDES
• N BODY PROBLEM
• COMPUTERS
• PERTURBATION THEORY

Subject Categories:

• Unmanned Spacecraft
• Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE