Randy Rose
California Institute of Technology
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Featured researches published by Randy Rose.
Science | 2006
Steven J. Ostro; Jean-Luc Margot; Lance A. M. Benner; Jon D. Giorgini; Daniel J. Scheeres; Eugene G. Fahnestock; Julie Bellerose; Michael C. Nolan; Christopher Magri; Petr Pravec; P. Scheirich; Randy Rose; Raymond F. Jurgens; Eric M. De Jong; Shigeru Suzuki
High-resolution radar images reveal near-Earth asteroid (66391) 1999 KW4 to be a binary system. The ∼1.5-kilometer-diameter primary (Alpha) is an unconsolidated gravitational aggregate with a spin period ∼2.8 hours, bulk density ∼2 grams per cubic centimeter, porosity ∼50%, and an oblate shape dominated by an equatorial ridge at the objects potential-energy minimum. The ∼0.5-kilometer secondary (Beta) is elongated and probably is denser than Alpha. Its average orbit about Alpha is circular with a radius ∼2.5 kilometers and period ∼17.4 hours, and its average rotation is synchronous with the long axis pointed toward Alpha, but librational departures from that orientation are evident. Exotic physical and dynamical properties may be common among near-Earth binaries.
Science | 1995
Steven J. Ostro; R. Scott Hudson; Raymond F. Jurgens; K. D. Rosema; D. B. Campbell; D. K. Yeomans; J. F. Chandler; Jon D. Giorgini; Ron Winkler; Randy Rose; S. Denise Howard; Martin A. Slade; Phil Perillat; I. I. Shapiro
Delay-Doppler images of the Earth-crossing asteroid 4179 Toutatis achieve resolutions as fine as 125 nanoseconds (19 meters in range) and 8.3 millihertz (0.15 millimeter per second in radial velocity) and place hundreds to thousands of pixels on the asteroid, which appears to be several kilometers long, topographically bifurcated, and heavily cratered. The image sequence reveals Toutatis to be in an extremely slow, non-principal axis rotation state.
Science | 2006
Daniel J. Scheeres; Eugene G. Fahnestock; S. J. Ostro; Jean-Luc Margot; Lance A. M. Benner; Julie Bellerose; Jon D. Giorgini; Michael C. Nolan; Christopher Magri; Petr Pravec; P. Scheirich; Randy Rose; Raymond F. Jurgens; E. M. de Jong; S. Suzuki
Dynamical simulations of the coupled rotational and orbital dynamics of binary near-Earth asteroid 66391 (1999 KW4) suggest that it is excited as a result of perturbations from the Sun during perihelion passages. Excitation of the mutual orbit will stimulate complex fluctuations in the orbit and rotation of both components, inducing the attitude of the smaller component to have large variation within some orbits and to hardly vary within others. The primarys proximity to its rotational stability limit suggests an origin from spin-up and disruption of a loosely bound precursor within the past million years.
Planetary and Space Science | 1999
P.R. Mahapatra; Steven J. Ostro; Lance A. M. Benner; K. D. Rosema; Raymond F. Jurgens; Ron Winkler; Randy Rose; Jon D. Giorgini; D. K. Yeomans; Martin A. Slade
Abstract We report Doppler-only radar observations of Icarus at Goldstone at a transmitter frequency of 8510 MHz (3.5 cm wavelength) during 8–10 June 1996, the first radar detection of the object since 1968. Optimally filtered and folded spectra achieve a maximum opposite-circular (OC) polarization signal-to-noise ratio of about 10 and help to constrain Icarus physical properties. We obtain an OC radar cross section of 0.05 km 2 (with a 35% uncertainty), which is less than values estimated by Goldstein, 1969 and by Pettengill et al., 1969 , and a circular polarization (SC⧸OC) ratio of 0.5±0.2. We analyze the echo power spectrum with a model incorporating the echo bandwidth B and a spectral shape parameter n , yielding a coupled constraint between B and n . We adopt 25 Hz as the lower bound on B , which gives a lower bound on the maximum pole-on breadth of about 0.6 km and upper bounds on the radar and optical albedos that are consistent with Icarus tentative QS classification. The observed circular polarization ratio indicates a very rough near-surface at spatial scales of the order of the radar wavelength.
Icarus | 1999
Steven J. Ostro; R. Scott Hudson; K. D. Rosema; Jon D. Giorgini; Raymond F. Jurgens; D. K. Yeomans; Paul W. Chodas; Ron Winkler; Randy Rose; D. Choate; Reginald A. Cormier; Dan Kelley; Ron Littlefair; Lance A. M. Benner; M. Thomas; Martin A. Slade
Science | 2002
Jon D. Giorgini; S. J. Ostro; Lance A. M. Benner; Paul W. Chodas; S. R. Chesley; Raymond Scott Hudson; Michael C. Nolan; A. R. Klemola; E. M. Standish; Raymond F. Jurgens; Randy Rose; Alan B. Chamberlin; D. K. Yeomans; Jean-Luc Margot
Icarus | 2000
R.S. Hudson; S. J. Ostro; Raymond F. Jurgens; K. D. Rosema; Jon D. Giorgini; Ron Winkler; Randy Rose; D. Choate; Reginald A. Cormier; C.R. Franck; R. Frye; D. Howard; D. Kelley; R. Littlefair; Martin A. Slade; Lance A. M. Benner; M. Thomas; David L. Mitchell; Paul W. Chodas; D. K. Yeomans; Daniel J. Scheeres; Patrick Palmer; Alexander L. Zaitsev; Yasuhiro Koyama; Akiko M. Nakamura; Alan W. Harris; M.N. Meshkov
Meteoritics & Planetary Science | 2004
Steven J. Ostro; Lance A. M. Benner; Michael C. Nolan; Christopher Magri; Jon D. Giorgini; Daniel J. Scheeres; Mikko Kaasalainen; David Vokrouhlický; Steven R. Chesley; Jean-Luc Margot; Raymond F. Jurgens; Randy Rose; D. K. Yeomans; Shigeru Suzuki; Eric M. De Jong
Icarus | 1996
Steven J. Ostro; Raymond F. Jurgens; K. D. Rosema; R. Scott Hudson; Jonathan D. Giorgini; Ron Winkler; D. K. Yeomans; Dennis Choate; Randy Rose; Martin A. Slade; S. Denise Howard; Daniel J. Scheeres; David L. Mitchell
Science | 1999
Steven J. Ostro; Petr Pravec; Lance A. M. Benner; Raymond Scott Hudson; L. Sarounova; Michael D. Hicks; David L. Rabinowitz; J. V. Scotti; D. J. Tholen; Marek Wolf; Raymond F. Jurgens; M. L. Thomas; Jon D. Giorgini; P. W. Chodas; D. K. Yeomans; Randy Rose; R. Frye; K. D. Rosema; Ron Winkler; Martin A. Slade