Radar Observations and a Physical Model of Asteroid 4660 Nereus

Details Radar Observations and a Physical Model of Asteroid 4660 Nereus Radar Observations and a Physical Model of Asteroid 4660 Nereus

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2505b&link_type=abstract

American Astronomical Society, DPS meeting #40, #25.05; Bulletin of the American Astronomical Society, Vol. 40, p.432

Astronomy and Astrophysics

Astronomy

Scientific paper

We report Arecibo (S-band, 2380-MHz, 13-cm) and Goldstone (X-band, 8560-MHz, 3.5-cm) radar observations of Nereus (E-class) during its 2002 close approach. Nereus has a circular polarization (SC/OC) ratio of 0.74±0.08, which implies severe near-surface centimeter-to-decimeter scale roughness. We have used an extensive dataset of delay-Doppler images and continuous wave (CW) spectra to construct a 3D shape model, which resembles an ellipsoid with principal-axis dimensions X=510±20; m, Y=330±20; m and Z=241+80(-10) m. The pole direction is approximately located at ecliptic longitude, latitude of λ=+25°, β=+80° with an uncertainty radius of 10°. Our data yield a refined rotation period of 15.16±0.04 h. Dynamical analysis of our model suggests that YORP alteration of the rotation period may become evident within a few years. We also find that spacecraft orbits about Nereus are feasible.

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