Arecibo and Goldstone Radar Images of Near-Earth Asteroid (136849) 1998 CS1

Details Arecibo and Goldstone Radar Images of Near-Earth Asteroid (136849) 1998 CS1 Arecibo and Goldstone Radar Images of Near-Earth Asteroid (136849) 1998 CS1

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4309b&link_type=abstract

American Astronomical Society, DPS meeting #41, #43.09

Astronomy and Astrophysics

Astronomy

Scientific paper

We report Arecibo (2380-MHz, 13-cm) and Goldstone (8560-MHz, 3.5-cm) delay-Doppler radar images of 1998 CS1 obtained between 2009 January 13-21 during this asteroid's close approach within 0.029 AU ( 11 lunar distances). 1998 CS1 was a very strong radar target: the images achieve resolutions as fine as 7.5 meters in range, place thousands of pixels on the asteroid, reveal a host of surface features, and indicate that 1998 CS1 is an oblate, asymmetric, rapid rotator with an equatorial diameter of about 1.2 km. The surface has prominent concavities that are probably impact craters, structure along the leading edges that resembles the pronounced ridge seen along the equator of binary asteroid (66391) 1999 KW4 (Ostro et al., 2006, Science 314, 1276), and several small, radar-bright features that may be boulders similar to those seen on (25143) Itokawa by the Hayabusa spacecraft. The rotation evident in the radar images is consistent with the photometrically-derived rotation period of 2.8 h (J. Pollock, P. Pravec, M. D. Hicks, and H. Rhoades, pers. comm.). The 1998 CS1 data are among the most detailed radar images in existence; Arecibo radar imaging opportunities of this caliber are currently possible multiple times annually and will become more frequent as the rate of near-Earth asteroid discoveries accelerates.

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