Hilda asteroids among Jupiter family comets

Sisto, R. P. Di; Brunini, A.; Dirani, L. D.; Orellana, R. B.

doi:10.1016/j.icarus.2004.10.024

Cited by 33 publications

(29 citation statements)

References 20 publications

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“…In the ACO sample we found 15, 46 and 59 objects, respectively, that are in excess from the expected values and are indicative of the presence in the ACO population of objects that are not comets in a dormant state. These objects could be asteroids (possibly Hildas) with T J < 3 obtaining their present orbits by some dynamical mechanism that perturbed the original asteroidal orbit changing its Tisserand invariant (Di Sisto et al 2005). …”

Section: Discussionmentioning

confidence: 99%

Collisional activation of asteroids in cometary orbits

Díaz¹,

Gil-Hutton²

2008

A&A

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Aims. We study the time an asteroid in a cometary orbit must wait to receive a collision producing a crater depth enough to expose subsurface volatiles, aiming to analyze the possibility of collisional reactivation of these objects if they are dormant comets. Methods. We perform a numerical integration of the asteroids in cometary orbits and a population of projectiles to find the mean intrinsic collision probabilities and mean impact velocities of the targets. The projectile population was obtained as a sample with the same distribution of orbital elements as observed for main belt asteroids, and we also take into account that its size distribution changes for different size ranges. Only 206 asteroids in cometary orbits, that are not members of other asteroid groups, with a Tisserand parameter 2 ≤ T J ≤ 2.9 and perihelion distance q > 1.3 AU were considered. Results. A large fraction of the objects in the sample receive at least 1 collision energetic enough to break the comet crust and allow a dormant comet to reach an active state in a period shorter than a Jupiter Family Comet dynamical lifetime. A large fraction of the objects in the sample with r t ≥ 8-9 km receive several collisions and could be active for more than 3 × 10 4 yr. We found an excess in the number of dormant comet candidates from the expected values which is indicative of the presence in the ACOs population of objects that are not comets in a dormant state. These objects could be asteroids with T J < 3 that reach their present orbits by some dynamical mechanism that perturbs the original asteroidal orbit changing its Tisserand invariant.

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Section: Discussionmentioning

confidence: 99%

Collisional activation of asteroids in cometary orbits

Díaz¹,

Gil-Hutton²

2008

A&A

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“…In this case the unbiased s-value could be higher. Di Sisto et al (2005), analyzing the dynamical evolution of escapees from the 3:2 mean motion resonance, Hildas, found that most of those that are injected into a JFC-like orbit have q > 2.5 AU. They have not been taken into account in the estimated size distribution due to our criterion of minimizing the observational bias.…”

Section: Discussionmentioning

confidence: 99%

The size distribution of asteroids in cometary orbits and related populations

Álvarez-Candal

Licandro

2006

A&A

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Aims. In this work we study the cumulative size distribution of the population of asteroids in cometary orbits (ACOs), aiming to discriminate its cometary or asteroidal origin. Methods. The cumulative luminosity function was determined based on the absolute magnitudes of the ACOs. The cumulative size distribution was then derived and compared to that of possible sources of ACOs, such as the Trojans and Hilda asteroids and Jupiter family comets. The size distribution of the two sub-populations, NEOs and non-NEOs, identified by Licandro et al. (2005) were also analyzed.Results. The derived cumulative size distribution index of the ACO population is 2.55 ± 0.04. The two subpopulations have distinct indexes: −2.20 ± 0.04 and −2.45 ± 0.04 for the NEOs and non-NEOs, respectively. The first value is similar to that of the Trojans and Hilda asteroids and the second to the Jupiter family comets.The obtained values suggest that the non-NEO sub-population of ACOs can be composed of a significant fraction of dormant Jupiter family comets. On the other hand, the NEO sub-population is mostly formed by scattered objects from diverse sources, including main belt asteroids.

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“…Di Sisto et al (2005) performed numerical simulations to study the dynamical evolution of Hilda asteroids and found that 99% of the objects escaping from the resonance behave like JFCs, at least during the first 1000 yr. From the physical point of view, it is not easy to differentiate between escaped Hildas and QHCs because both populations are mainly D-and P-types (Fitzsimmons et al 1994;Dahlgren & Lagerkvist 1995;Dahlgren et al 1997Dahlgren et al , 1999Jewitt 2002;Gil-Hutton & Brunini 2008); to distinguish comets from asteroids in the external zone of the main belt it is necessary to study the orbital evolution of these objects.…”

Section: Introductionmentioning

confidence: 99%

Comet candidates among quasi-Hilda objects

Gil-Hutton

García-Migani

2016

A&A

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Aims. We present the results of a search for quasi-Hilda comets. We wanted to find objects that have recently arrived from the Centaur zone that could became active near the perihelion of their orbits. Methods. Two hundred and seventy-seven objects from the ASTORB database were selected following a dynamical criteria to constrain the unstable quasi-Hilda region. These objects were integrated backward 50 000 yr in order to identify those that have recently arrived from the outer regions of the solar system. Results. The backward integration showed that 11 objects could be Centaurs or transneptunian objects that ended their dynamical evolution as quasi-Hilda comets. The dynamical evolution of these objects from a statistical point of view was studied by computing the time-averaged distribution of a number of clones as a function of the aphelion and perihelion distances. All the candidates show a dynamical behavior that is expected for comets injected in the inner solar system from the Centaur or transneptunian regions and reaching the quasi-Hilda region.

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Hilda asteroids among Jupiter family comets

Cited by 33 publications

References 20 publications

Collisional activation of asteroids in cometary orbits

Collisional activation of asteroids in cometary orbits

The size distribution of asteroids in cometary orbits and related populations

Comet candidates among quasi-Hilda objects

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