On the Astrid asteroid family

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dc.contributor.authorCarruba, V. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:29:18Z
dc.date.available2018-12-11T17:29:18Z
dc.date.issued2016-09-11
dc.description.abstractAmong asteroid families, the Astrid family is peculiar because of its unusual inclination distribution. Objects at a ≃ 2.764 au are quite dispersed in this orbital element, giving the family a 'crab-like' appearance. Recent works showed that this feature is caused by the interaction of the family with the s - sC nodal secular resonance with Ceres, that spreads the inclination of asteroids near its separatrix. As a consequence, the currently observed distribution of the vW component of terminal ejection velocities obtained from inverting Gauss equation is quite leptokurtic, since this parameter mostly depends on the asteroids inclination. The peculiar orbital configuration of the Astrid family can be used to set constraints on key parameters describing the strength of the Yarkovsky force, such as the bulk and surface density and the thermal conductivity of surface material. By simulating various fictitious families with different values of these parameters, and by demanding that the current value of the kurtosis of the distribution in vW be reached over the estimated lifetime of the family, we obtained that the thermal conductivity of Astrid family members should be ≃0.001 W m-1 K-1, and that the surface and bulk density should be higher than 1000 kg m-3. Monte Carlo methods simulating Yarkovsky and stochastic Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) evolution of the Astrid family show its age to be T = 140 � 30 Myr old, in good agreement with estimates from other groups. Its terminal ejection velocity parameter is in the range VEJ= 5-5+17 m s-1. Values of VEJ larger than 25 m s-1 are excluded from constraints from the current inclination distribution.en
dc.description.affiliationUNESP Univ. Estadual Paulista Grupo de din�mica Orbital e Planetologia
dc.description.affiliationUnespUNESP Univ. Estadual Paulista Grupo de din�mica Orbital e Planetologia
dc.format.extent1605-1613
dc.identifierhttp://dx.doi.org/10.1093/mnras/stw1445
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, v. 461, n. 2, p. 1605-1613, 2016.
dc.identifier.doi10.1093/mnras/stw1445
dc.identifier.file2-s2.0-84982307205.pdf
dc.identifier.issn1365-2966
dc.identifier.issn0035-8711
dc.identifier.scopus2-s2.0-84982307205
dc.identifier.urihttp://hdl.handle.net/11449/178203
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.ispartofsjr2,346
dc.relation.ispartofsjr2,346
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAsteroids: general
dc.subjectAsteroids: individual: Astrid
dc.subjectCelestial mechanics
dc.subjectMinor planets
dc.titleOn the Astrid asteroid familyen
dc.typeArtigo

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