Osiris-rex navigation small force models

Jeroen L. Geeraert, Jason M. Leonard, Patrick W. Kenneally, Peter G. Antreasian, Michael C. Moreau, Dante S. Lauretta

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The Navigation Campaign of the NASA OSIRIS-REx mission consists of three phases: the Approach phase, Preliminary Survey phase, and the Orbital A phase. These phases spanned from August 2018 until February 28, 2019. The OSIRIS-REx spacecraft arrived at asteroid (101955) Bennu on December 3rd, 2018 thereby initiating the Preliminary Survey phase consisting of five 7-km altitude flybys of the asteroid. Orbit insertion followed on December 31st, 2018 commencing the Orbital A phase whereby the spacecraft’s average frozen orbit radius was less than 2 km. In this paper the small forces are presented that govern the spacecraft dynamics near the asteroid for the Navigation Campaign. These small forces include: solar radiation pressure, spacecraft thermal re-radiation, the antenna and LIDAR radiation pressure, and trending from desaturation maneuvers (desats). Extensive work on modeling these forces has enabled the navigation performance to exceed expectations and has reduced the stochastic accelerations below 1 x 10–12 km/s2 resulting in smaller trajectory predicted errors, essential for science planning of the mission.

Original languageEnglish (US)
Title of host publicationAAS/AIAA Astrodynamics Specialist Conference, 2019
EditorsKenneth R. Horneman, Christopher Scott, Brian W. Hansen, Islam I. Hussein
PublisherUnivelt Inc.
Number of pages16
ISBN (Print)9780877036654
StatePublished - 2020
EventAAS/AIAA Astrodynamics Specialist Conference, 2019 - Portland, United States
Duration: Aug 11 2019Aug 15 2019

Publication series

NameAdvances in the Astronautical Sciences
ISSN (Print)0065-3438


ConferenceAAS/AIAA Astrodynamics Specialist Conference, 2019
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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