Particle Ejection Contributions to the Rotational Acceleration and Orbit Evolution of Asteroid (101955) Bennu.
Bennu
OSIRIS‐REx
YORP
particle ejection
Journal
Journal of geophysical research. Planets
ISSN: 2169-9097
Titre abrégé: J Geophys Res Planets
Pays: United States
ID NLM: 101661797
Informations de publication
Date de publication:
Mar 2020
Mar 2020
Historique:
received:
21
11
2019
revised:
07
02
2020
accepted:
11
02
2020
entrez:
28
7
2020
pubmed:
28
7
2020
medline:
28
7
2020
Statut:
ppublish
Résumé
This paper explores the implications of the observed Bennu particle ejection events for that asteroid's spin rate and orbit evolution, which could complicate interpretation of the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) and Yarkovsky effects on this body's spin rate and orbital evolution. Based on current estimates of particle ejection rates, we find that the overall contribution to Bennu's spin and orbital drift is small or negligible as compared to the Yarkovsky and YORP effects. However, if there is a large unseen component of smaller mass ejections or a strong directionality in the ejection events, it could constitute a significant contribution that could mask the overall YORP effect. This means that the YORP effect may be stronger than currently assumed. The analysis is generalized so that the particle ejection effect can be assessed for other bodies that may be subject to similar mass loss events. Further, our model can be modified to address different potential mechanisms of particle ejection, which are a topic of ongoing study.
Identifiants
pubmed: 32714726
doi: 10.1029/2019JE006284
pii: JGRE21311
pmc: PMC7375169
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e2019JE006284Informations de copyright
©2020. The Authors.
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