2008
DOI: 10.1051/0004-6361:20079236
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Collisional activation of asteroids in cometary orbits

Abstract: 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 sampl… Show more

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Cited by 4 publications
(3 citation statements)
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“…Assuming there are 3 × 10 5 asteroids in the outer main-belt with D ∼ 1 − 5 km, and the active lifetimes of these objects after a collision is 10 3−4 years (Hsieh and Jewitt, 2006b;Díaz and Gil-Hutton, 2008), there should be 3 − 30 active asteroids due to collisions. This is consistent with the upper limit derived for active MBCs.…”
Section: Comparison With Collisional Lifetimesmentioning
confidence: 99%
“…Assuming there are 3 × 10 5 asteroids in the outer main-belt with D ∼ 1 − 5 km, and the active lifetimes of these objects after a collision is 10 3−4 years (Hsieh and Jewitt, 2006b;Díaz and Gil-Hutton, 2008), there should be 3 − 30 active asteroids due to collisions. This is consistent with the upper limit derived for active MBCs.…”
Section: Comparison With Collisional Lifetimesmentioning
confidence: 99%
“…They are classified as main-belt comets (MBCs) (Hsieh and Jewitt, 2006); the MBCs are 133P/Elst-Pizzaro , P/2005 U1 (Read et al, 2005), 176P/LINEAR (Hsieh et al, 2011), P/2008 R1 (Garrad) (Jewitt et al, 2009), P/2010 A2 (LINEAR) (Birtwhistle et al, 2010), P/2010 R2 (La Sagra) (Marsden et al, 2010), and ( 596) Scheila (Bodewits et al, 2011;Jewitt et al, 2011). One possible activation mechanism for MBCs is impacts with small (e.g., meter-sized) objects (Toth, 2000;Díaz and Gil-Hutton, 2008;Jewitt et al, 2010;Snodgrass et al, 2010;Bodewits et al, 2011;Jewitt et al, 2011). The other activation mechanisms are rotational-fissions due to the spin-up by Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effects (Jewitt et al, 2010), and thermal influences (Jewitt et al, 2009).…”
Section: Introductionmentioning
confidence: 99%
“…Figure 4, left-hand side panels, shows that the nominal orbit led 2003 BM 1 into the outer belt from the neighborhood of Uranus. Díaz and Gil-Hutton (2008) included this object in their study of asteroids in cometary orbits concluding that some of those objects are not dormant comet candidates from the Jupiter family-those with Tisserand's parameter, T J (Murray and Dermott 1999), in the range 2-3 and orbital periods under 20 yr or 200 yr, depending on the authorsbut asteroids that reached their current orbits as a result of perturbations. The Tisserand parameter, which is a quasi-invariant, is given by the expression:…”
Section: Bmmentioning
confidence: 99%