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The Origin Of Asteroid 101955 (1999 Rq(36)), Humberto Campins, Alessandro Morbidelli, Kleomenis Tsiganis, Julia De León, Javier Licandro, Dante Lauretta
The Origin Of Asteroid 101955 (1999 Rq(36)), Humberto Campins, Alessandro Morbidelli, Kleomenis Tsiganis, Julia De León, Javier Licandro, Dante Lauretta
Faculty Bibliography 2010s
Near-Earth asteroid (NEA) 101955 (1999 RQ(36); henceforth RQ36) is especially accessible to spacecraft and is the primary target of NASA's OSIRIS-REx sample return mission; it is also a potentially hazardous asteroid. We combine dynamical and spectral information to identify the most likely main-belt origin of RQ(36) and we conclude that it is the Polana family, located at a semimajor axis of about 2.42 AU. We also conclude that the Polana family may be the most important inner-belt source of low-albedo NEAs. These conclusions are based on the following results. (1) Dynamical evidence strongly favors an inner-belt, low-inclination (2.15 AU < a < 2.5 AU and i < 10 degrees) origin, suggesting the v(6) resonance as the preferred (95% probability) delivery route. (2) This region is dominated by the Nysa and Polana families. (3) The Polana family is characterized by low albedos and B-class spectra or colors, the same albedo and spectral class as RQ36. (4) The Sloan Digital Sky Survey colors show that the Polana family is the branch of the Nysa-Polana complex that extends toward the v(6) resonance; furthermore, the Polana family has delivered objects of the size of RQ36 and larger into the v(6) resonance. (5) A quantitative comparison of visible and near-infrared spectra does not yield a unique match for RQ36; however, it is consistent with a compositional link between RQ36 and the Polana family.
Origin Of The Near-Earth Asteroid Phaethon And The Geminids Meteor Shower, J. De León, H. Campins, K. Tsiganis, A. Morbidelli, J. Licandro
Origin Of The Near-Earth Asteroid Phaethon And The Geminids Meteor Shower, J. De León, H. Campins, K. Tsiganis, A. Morbidelli, J. Licandro
Faculty Bibliography 2010s
Aims. In this paper we establish a compositional and dynamical connection between two B-type objects: main belt asteroid (2) Pallas and near-Earth asteroid (3200) Phaethon. The final purpose is to help understand the origin of this very interesting object. Methods. We first compare visible and near-infrared spectra of asteroids Phaethon and Pallas. We then compare the reflectance spectra of Phaethon with all the available visible spectra of B-type asteroids belonging to the Pallas family. One last spectral comparison is then performed to search for any correspondence between Phaethon and any B-type asteroid in the main belt. Numerical simulations are also …
Observations, Compositional, And Physical Characterization Of Near-Earth And Mars-Crosser Asteroids From A Spectroscopic Survey, J. De León, J. Licandro, M. Serra-Ricart, N. Pinilla-Alonso, H. Campins
Observations, Compositional, And Physical Characterization Of Near-Earth And Mars-Crosser Asteroids From A Spectroscopic Survey, J. De León, J. Licandro, M. Serra-Ricart, N. Pinilla-Alonso, H. Campins
Faculty Bibliography 2010s
Aims. We analyse a significantly large sample of spectroscopic data to provide a compositional characterization of the near-Earth asteroid population. We present visible and near-infrared spectra of a total of 74 near-Earth asteroids (NEAs) and Mars-crossers (MCs), covering the wavelength region from 0.5 to 2.5 mu m. Using spectra of NEAs from other databases to enlarge our sample, and compiling two comparison samples of main belt asteroids (MBs) and ordinary chondrites (OCs), we analyse a total of 79 NEAs, 91 MBs, and 103 OCs. Methods. We obtained our visible and near-infrared spectra using the instruments and the telescopes located at …