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Title: THE ORIGIN OF ASTEROID 162173 (1999 JU{sub 3})

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 {nu}{sub 6} resonance, more specifically, the region with 2.15 AU < a < 2.5 AU and i < 8 Degree-Sign . The geometric albedo of JU{sub 3} is 0.07 {+-} 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 {nu}{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 mostmore » likely source of JU{sub 3}.« less
Authors:
 [1] ;  [2] ; ; ; ;  [3] ;  [4]
  1. Physics Department, University of Central Florida, P.O. Box 162385, Orlando, FL 32816-2385 (United States)
  2. Department of Edaphology and Geology, University of La Laguna, E-38071 Tenerife (Spain)
  3. Observatoire de la Cote d'Azur, Universite de Nice Sophia Antipolis (UNS), CNRS UMR7293, F-06108 Nice Cedex 2 (France)
  4. Instituto de Astrofisica de Canarias (IAC), C/Via Lactea s/n, E-38205 La Laguna (Spain)
Publication Date:
OSTI Identifier:
22122894
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 146; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALBEDO; ASTEROIDS; EXPLORATION; INCLINATION; INFRARED SPECTRA; NASA; ORIGIN; PLANETS; RESONANCE