Dynamics of planet-crossing asteroids: Classes of orbital behavior

Milani, Andrea; Carpino, M.; Hahn, Gerhard; Nobili, A. M.

doi:10.1016/0019-1035(89)90174-7

Cited by 155 publications

(81 citation statements)

References 19 publications

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“…3b in Tsiganis et al 2003;Yoshikawa 1989). A similar increase in inclination can probably also be achieved by close encounters with Earth and/or Venus, as shown for the Alinda class by Milani et al (1989). Moreover, notice that at the present time, the orbit of 2001 XR31 is such that it can have "strong" close encounter with the Earth and with Mars, and for this reason it is difficult to get constraints of its origin (see http://newton.dm.unipi.it/cgi-bin/neodys/neoibo).…”

Section: Dynamical Implicationssupporting

confidence: 61%

An R-type asteroid within near-Earth objects?

Marchi

Lazzarin

Magrin

2004

A&A

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Abstract. We present visible and near-infrared spectroscopy of 2001 XR31, a previously unclassified small near-Earth object (NEOs). Its spectrum resembles that of basaltic body, with the distinctive 1 and 2 µm pyroxene absorption bands, similar to those found on V-type bodies. However, the spectrum of 2001 XR31 is somewhat peculiar and we discuss whether it can belong to another class of basaltic bodies, namely the rare R-class. If confirmed, this object would be the only R-type detected among NEOs so far. In the light of this possibility, we also discuss the relationships of 2001 XR31 with other main belt R-types and a possible explanation of its origin.

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Section: Dynamical Implicationssupporting

confidence: 61%

An R-type asteroid within near-Earth objects?

Marchi

Lazzarin

Magrin

2004

A&A

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“…These fragments can be injected into the ν6 and J3:1 MMR with Jupiter, which causes a change of their eccentricities and brings them into orbits intersecting the orbits of Mars (Mars crossers) and/or Earth (Earth crossers, e.g. Milani et al 1989): gravitationally, the NEAs are transported first to Mars, mainly by MMRs, three-body mean motion resonances (3BMMRs, for a description of this kind of resonances see Nesvorny & Morbidelli 1998) and secular resonances (SRs), and then to other more interior planets due especially to close encounters with Mars. Also non-gravitational forces can play a role in the transportation as was shown by Bottke et al (2002Bottke et al ( , 2006; Greenstreet, Ngo & Gladman (2012) andĆuk, Gladman & Nesvorný (2014, but as a first stage we will take into account only gravitational forces in this work and the Yarkovsky effect will be considered in a future work.…”

Section: Introductionmentioning

confidence: 99%

The Hungaria region as a possible source of Trojans and satellites in the inner Solar system

Galiazzo

Schwarz

2014

Monthly Notices of the Royal Astronomical Society

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The Hungaria Family (the closest region of the Main Belt to Mars) is an important source of Planet-Crossing-Asteroids and even impactors of terrestrial planets. We present the possibility that asteroids coming from the Hungaria Family get captured into co-orbital motion with the terrestrial planets in the inner solar system. Therefore we carried out long term numerical integrations (up to 100 Myr) to analyze the migrations from their original location -the Hungaria family region-into the inner solar system. During the integration time we observed whether or not the Hungarias get captured into a co-orbital motion with by the terrestrial planets. Our results show that 5.5 % of 200 Hungarias, selected as a sample of the whole group, escape from the Hungaria region and the probability from that to become co-orbital objects (Trojans, satellites or horseshoes) turns out to be ∼ 3.3%: 1.8% for Mars and 1.5% for the Earth. In addition we distinguished in which classes of co-orbital motion the asteroids get captured and for how long they stay there in stable motion. Most of the escaped Hungarias become Quasi-satellites and the ones captured as Trojans favour the L 5 lagrangian point. This work highlights that the Hungaria region is a source of Mars and also Earth co-orbital objects.

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“…Recent perturbation computations by Milani et al (1989), extending over 200,000 years, classify seven of the known Apollo/Amor objects as "comets." All of them are included in Figure 2, together with two additional objects: 944 Hidalgo and 1983 LC.…”

Section: The Final Phases Of Agingmentioning

confidence: 99%

“…The degree of surface crusting has been directly observed only on P/Halley (Whipple 1986, Keller 1987. Asteroid-like objects moving in typical cometary orbits (Rickman 1985, Milani et al 1989 indicate that there very probably are also cases of complete crusting, or complete depletion of volatiles, as the final evolutionary stage.…”

Section: Introductionmentioning

confidence: 99%

Evidence for Physical Aging of Periodic Comets

Kresák

1989

International Astronomical Union Colloquium

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ABSTRACT. Observational evidence for the aging processes in periodic comets is reviewed. This includes progressive changes of the comets' absolute brightness, sudden destructive events (outbursts and splitting of cometary nuclei), temporary intermissions in activity, total disappearance, and existence of asteroidal objects moving in cometary orbits. Indirect statistical evidence is provided by the equilibrium between the aging rate and the net injection of comets into the inner planetary system. All of this information is consistent with typical active lifetimes of 200 to 500 revolutions at small perihelion distances (q < 3 AU). The active lifetimes are sometimes intermitted by dormant periods, which tend to occur especially during the latest phases of evolution. Splits and outbursts do not seem to have a decisive statistical effect on the survival time. Some periodic comets evolve into inactive asteroid-like objects, but the question of whether these still contain some supply of volatiles, and thus can renew their activity, remains open.

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Dynamics of planet-crossing asteroids: Classes of orbital behavior

Cited by 155 publications

References 19 publications

An R-type asteroid within near-Earth objects?

An R-type asteroid within near-Earth objects?

The Hungaria region as a possible source of Trojans and satellites in the inner Solar system

Evidence for Physical Aging of Periodic Comets

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