Discovery of an asteroid family linked to (22) Kalliope and its moon Linus

Abstract

According to adaptive-optics observations by Ferrais et al., (22) Kalliope is a 150-km, dense and differentiated body. Here, we interpret (22) Kalliope in the context of bodies in its surroundings. While there is a known moon Linus, with a 5:1 size ratio, no family has been reported in the literature, which is in contradiction with the existence of the moon. Using the hierarchical clustering method (HCM) along with physical data, we identified the Kalliope family. Previously, it was associated to (7481) San Marcello. We then used various models (N-body, Monte-Carlo, SPH) of its orbital and collisional evolution, including the break-up of the parent body, to estimate the dynamical age of the family and address its link to Linus. The best-fit age is (900+-100) My according to our collisional model, in agreement with the position of (22) Kalliope, which was modified by chaotic diffusion due to 4-1-1 three-body resonance with Jupiter and Saturn. It seems possible to create Linus and the Kalliope family at the same time, although our SPH simulations show a variety of outcomes, for both satellite size and the family size-frequency distribution. The shape of (22) Kalliope itself was most likely affected by gravitational reaccumulation of `streams', which creates characteristic hills observed on the surface. If the body was differentiated, its internal structure is surely asymmetric.

A&A, accepted

References in corpus (12)

• The Size Distributions of Asteroid Families in the SDSS Moving Object Catalog 4
• Constraining the cometary flux through the asteroid belt during the late heavy bombardment
• New determination of the size and bulk density of the binary asteroid 22 Kalliope from observations of mutual eclipses
• Olivine-dominated A-type asteroids in the Main Belt: Distribution, Abundance and Relation to Families
• ADAM: a general method for using various data types in asteroid reconstruction
• The Eos family halo
• Terrestrial planet formation by torque-driven convergent migration of planetary embryos
• An automatic approach to exclude interlopers from asteroid families
• A six-part collisional model of the main asteroid belt
• Impacts into rotating targets: angular momentum draining and efficient formation of synthetic families
• The young Hobson family: Possible binary parent body and low-velocity dispersal
• The binary asteroid 22 Kalliope: Linus orbit determination on the basis of speckle interferometric observations

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• 2021 occultations and transits of Linus orbiting (22) Kalliope: I. Polygonal and `cliptracing' algorithm