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

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

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006icar..184..198s&link_type=abstract

Icarus, Volume 184, Issue 1, p. 198-210.

Physics

18

Scientific paper

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 kg, leading to a primary bulk density of ρ=0.9+0.5/-0.4 gcm, one of the lowest values yet measured for a main-belt or near-Earth asteroid.

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