Particle Ejection Contributions to the Rotational Acceleration and Orbit Evolution of Asteroid (101955) Bennu

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10422455" target="_blank" >RIV/00216208:11320/20:10422455 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1aWlmkxS-I" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1aWlmkxS-I</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2019JE006284" target="_blank" >10.1029/2019JE006284</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Particle Ejection Contributions to the Rotational Acceleration and Orbit Evolution of Asteroid (101955) Bennu

Popis výsledku v původním jazyce

This paper explores the implications of the observed Bennu particle ejection events for that asteroid&apos;s spin rate and orbit evolution, which could complicate interpretation of the Yarkovsky-O&apos;Keefe-Radzievskii-Paddack (YORP) and Yarkovsky effects on this body&apos;s spin rate and orbital evolution. Based on current estimates of particle ejection rates, we find that the overall contribution to Bennu&apos;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. Plain Language Summary The near-Earth asteroid Bennu has been observed to be ejecting particles of rock from its surface. The possible effect of these particle ejections on the asteroid&apos;s spin rate and orbit is studied using numerical modeling. We show that the effect is likely minimal, although for certain ejection geometries, their effect on the spin rate could be more important. The loss of mass caused by the particle ejections would likely limit the asteroid&apos;s rotational acceleration, suggesting that the acceleration effect on this body may be larger than assumed. We consider how different mechanisms of ejection could be modeled using our approach.

Název v anglickém jazyce

Particle Ejection Contributions to the Rotational Acceleration and Orbit Evolution of Asteroid (101955) Bennu

Popis výsledku anglicky

This paper explores the implications of the observed Bennu particle ejection events for that asteroid&apos;s spin rate and orbit evolution, which could complicate interpretation of the Yarkovsky-O&apos;Keefe-Radzievskii-Paddack (YORP) and Yarkovsky effects on this body&apos;s spin rate and orbital evolution. Based on current estimates of particle ejection rates, we find that the overall contribution to Bennu&apos;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. Plain Language Summary The near-Earth asteroid Bennu has been observed to be ejecting particles of rock from its surface. The possible effect of these particle ejections on the asteroid&apos;s spin rate and orbit is studied using numerical modeling. We show that the effect is likely minimal, although for certain ejection geometries, their effect on the spin rate could be more important. The loss of mass caused by the particle ejections would likely limit the asteroid&apos;s rotational acceleration, suggesting that the acceleration effect on this body may be larger than assumed. We consider how different mechanisms of ejection could be modeled using our approach.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research: Planets

ISSN

2169-9097

e-ISSN

—

Svazek periodika

125

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

19

Strana od-do

e2019JE006284

Kód UT WoS článku

000535277900011

EID výsledku v databázi Scopus

2-s2.0-85082338352