Radar Observations of Near-Earth Asteroids 2062 Aten, 2101 Adonis, 3103 Eger, 4544 Xanthus, and 1992 QN

Details Radar Observations of Near-Earth Asteroids 2062 Aten, 2101 Adonis, 3103 Eger, 4544 Xanthus, and 1992 QN Radar Observations of Near-Earth Asteroids 2062 Aten, 2101 Adonis, 3103 Eger, 4544 Xanthus, and 1992 QN

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1041b&link_type=abstract

American Astronomical Society, DPS meeting #28, #10.41; Bulletin of the American Astronomical Society, Vol. 28, p.1105

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report cw radar observations of five diverse near-Earth asteroids at Arecibo (A) and Goldstone (G) between 1984 and 1996. In the table below, we have used weighted sums for each experiment to estimate the bandwidth B and the OC radar cross section sigma_ {oc}. Target Date Obs lambda B(Hz) sigmaoc SC/OC (cm) +/-50 km^2 2062 Aten 1/95 G 3.5 2+/-1 \quad 0.082 0.39+/-0.06 2101 Adonis 7/84 A 12.6 2+/-1 \quad 0.02 1.03+/-0.22 3103 Eger 7/86 A 12.6 10+/-2 \quad 0.62 0.80+/-0.11 8/91 G 3.5 43+/-5 \quad 0.57 0.94+/-0.10 7/96 G 3.5 45+/-5 \quad 0.48 1.02+/-0.10 4544 Xanthus 11/90 A 12.6 >3 \quad 0.15 <0.5 1992 QN 1/96 G 3.5 10+/-3 quad 0.086 1.10+/-0.19 Eger (rotation period P = 5.709 hr) is the only known E-class Earth-crosser (Veeder et al., 1989, AJ 97, 1211) and may be the aubrite parent body (Gaffey et al., 1992, Icarus 100, 95). The strongest Eger echo spectra (1996) are asymmetric with bandwidths that vary between \sim30 and \sim45 Hz as the asteroid rotates. These values set lower bounds of 1.7 and 2.6 km on the minimicrons and maximicrons breadths of the asteroid's pole-on silhouette. If Eger is modelled as a 1.7 \times 2.6 km biaxial ellipsoid, then its effective diameter (i.e., of a sphere with the same projected area) for an equatorial view is 1.7 km end-on and 2.1 km broadside or pole-on, inconsistent with published radiometric values (1.4--1.5 km) and implying a geometric albedo smaller than published values (0.53--0.63). The bandwidth estimate for Aten (P = 40.77 hr) indicates that the asteroid's maximicrons dimension is at least 0.8 km, a result that is consistent with its radiometrically determined diameter. The circular polarization ratios of Adonis, Eger, and 1992 QN are among the largest known for all asteroids and indicate extreme near-surface roughness at spatial scales near \lambda$.

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