Details

Autor(en) / Beteiligte

• Campins, Humberto
• De Leon, Julia
• Morbidelli, Alessandro
• Licandro, Javier
• Gayon-Markt, Julie
• DELBO, MARCO
• Michel, Patrick

Titel

THE ORIGIN OF ASTEROID 162173 (1999 JU 3 )

Ist Teil von

• The Astronomical journal, 2013-08, Vol.146 (2), p.1-6

Ort / Verlag

United States

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• Near-Earth asteroid (162173) 1999 JU sub(3) (henceforth JU sub(3)) is a potentially hazardous asteroid and the target of the Japanese Aerospace Exploration Agency's Hayabusa-2 sample return mission. JU sub(3) is also a backup target for two other sample return missions: NASA's OSIRIS-REx and the European Space Agency's Marco Polo-R. We use dynamical information to identify an inner-belt, low-inclination origin through the v sub(6) resonance, more specifically, the region with 2.15 AU < a < 2.5 AU and i < 8[degrees]. The geometric albedo of JU3 is 0.07 + or - 0.01, and this inner-belt region contains four well-defined low-albedo asteroid families (Clarissa, Erigone, Polana, and Sulamitis), plus a recently identified background population of low-albedo asteroids outside these families. Only two of these five groups, the background and the Polana family, deliver JU sub(3)-sized asteroids to the v sub(6) resonance, and the background delivers significantly more JU sub(3)-sized asteroids. The available spectral evidence is also diagnostic; the visible and near-infrared spectra of JU sub(3) indicate it is a C-type asteroid, which is compatible with members of the background, but not with the Polana family because it contains primarily B-type asteroids. Hence, this background population of low-albedo asteroids is the most likely source of JU sub(3).