Radar and infrared observations of binary near-Earth Asteroid 2002 CE26

We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be 3.5 ± 0.4   km in diameter...

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Veröffentlicht in:Icarus (New York, N.Y. 1962) N.Y. 1962), 2006-09, Vol.184 (1), p.198-210
Hauptverfasser: Shepard, Michael K., Margot, Jean-Luc, Magri, Christopher, Nolan, Michael C., Schlieder, Joshua, Estes, Benjamin, Bus, Schelte J., Volquardsen, Eric L., Rivkin, Andrew S., Benner, Lance A.M., Giorgini, Jon D., Ostro, Steven J., Busch, Michael W.
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container_issue 1
container_start_page 198
container_title Icarus (New York, N.Y. 1962)
container_volume 184
creator Shepard, Michael K.
Margot, Jean-Luc
Magri, Christopher
Nolan, Michael C.
Schlieder, Joshua
Estes, Benjamin
Bus, Schelte J.
Volquardsen, Eric L.
Rivkin, Andrew S.
Benner, Lance A.M.
Giorgini, Jon D.
Ostro, Steven J.
Busch, Michael W.
description We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be 3.5 ± 0.4   km in diameter and spheroidal; our corresponding nominal estimates of its visual and radar albedos are 0.07 and 0.24, respectively. Our IRTF spectrum shows the asteroid to be C-class with no evidence of hydration. Thermal models from the IRTF data provide a size and visual albedo consistent with the radar-derived estimate. We estimate the spin-pole to be within a few tens of degrees of λ = 317 ° , β = − 20 ° . Our radar observations reveal a secondary approximately 0.3 km in diameter, giving this binary one of the largest size differentials of any known NEA. The secondary is in a near-circular orbit with period 15.6 ± 0.1   h and a semi-major axis of 4.7 ± 0.2   km . Estimates of the binary orbital pole and secondary rotation rate are consistent with the secondary being in a spin-locked equatorial orbit. The orbit corresponds to a primary mass of M = 1.95 ± 0.25 × 10 13   kg , leading to a primary bulk density of ρ = 0.9 + 0.5 / − 0.4   g cm −3 , one of the lowest values yet measured for a main-belt or near-Earth asteroid.
doi_str_mv 10.1016/j.icarus.2006.04.019
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subjects Asteroids
Astronomy
composition
Earth, ocean, space
Exact sciences and technology
Radar observations
Solar system
surfaces
title Radar and infrared observations of binary near-Earth Asteroid 2002 CE26
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