Results 171 to 180 of about 13,063 (208)

The rotation of small asteroids

Icarus, 1984
The Binzel and Mulholland (1983) sample of photoelectrically determined rotational parameters for 17 main belt asteroids with diameters less than 30 km are compared with previous observations of asteroids of that size range. Rigorous statistical tests are applied to investigate bias effects and quantify results on asteroid rotation.
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New rotational periods of 18 asteroids

Planetary and Space Science, 2000
Abstract The results of photoelectric observations of 18 main-belt asteroids are discussed. The V-band lightcurves, the B–V colors, and the values of the synodic rotational period are presented. There exists no previous determination of the period for 13 of them.
C. Blanco, M. Di Martino, D. Riccioli
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Rotation of asteroids and planetary axial rotation theory

The Moon and the Planets, 1982
A theory (Barricelli, 1972) developed for the interpretation of planetary axial rotations is here applied to an interpretation of the axial rotations of major asteroids. The interpretation is based on the assumption that also asteroids can have satellite-systems, which may influence the axial rotation of the respective primaries. The reason why smaller
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Fast and Slow Rotation of Asteroids

Icarus, 2000
Abstract We present an analysis of the distribution of asteroid spin rates vs. size. The existence of significant populations of both slow and fast rotators among asteroids smaller than D=40 km, and especially below 10 km (where our sample is mostly near-Earth asteroids), is shown.
Petr Pravec, Alan W. Harris
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The rotation of asteroid (16) Psyche

Chinese Astronomy and Astrophysics, 1982
Abstract We used observations at 4 oppositions to calculate the rotation of the asteroid (16) Psyche. Our results are 1) the pole is λ 225°, β = +5° (1950.0), 2) the rotation is direct, and 3) the sidereal period is 4h 11m 45s.42 ± 0s.01. At the three oppositions of 1955, 1965 and 1980, the relative positions of the Sun, the Earth and the asteroids ...
null Zhou Xing-hai, null Yang Xiu-yi
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Rotational properties of outer belt asteroids

Icarus, 1989
Abstract We present new photometric observations of 13 asteroids (153, 190, 225, 279, 334, 420, 483, 528, 588, 692, 721, 940, 1583) orbiting in the outer part of the belt, beyond the Hecuba gap at 3.3 AU from the Sun. The resulting periods and amplitudes are then used to compare the properties of a main-belt asteroid sample and an outer-belt sample ...
V. Zappalà, M. Di Martino, A. Cellino, P. Farinella, G. De Sanctis, W. Ferreri   +5 more
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Color Variations of Asteroids during Rotation

1982
A list of asteroids is presented, observed frequently for color variations during rotation as an evidence for spots on the surface.+(−)sign means redder (bluer) at maximum brightness, < means no detection larger than scatter; lightcurve amplitudes are added, polarisation measurements and/ or other color indices are taken from reference 5.
H. J. Schober, A. Schroll
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Complex Rotators: Asteroid 4179 Toutatis

2012
In this chapter the assumption of uniform rotation is removed. Many asteroids are non-uniform rotators, potentially due to several different causes. These include spin-down due to the YORP effect, which can make an asteroid more susceptible to perturbing torques, and tumbling due to a close planetary flyby, an asteroid fission event, or an impact ...
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Spacecraft Motion About Slowly Rotating Asteroids

Journal of Guidance, Control, and Dynamics, 2002
Spacecraft motion about an arbitrary second-degree and second-order gravity eeld is investigated. We assume thatthegravityeeldisinuniformrotation aboutanaxisofitsmaximummomentofinertiaandthatitrotatesslowly as compared to the spacecraft orbit period. We derive the averaged Lagrange planetary equations for this system and use them, in conjunction with ...
W. Hu, D. J. Scheeres
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Asteroid Rotational Breakup Optimization

This paper proposes an optimization algorithm, Asteroid Rotational Breakup Optimization (ARBO), based on the physics metaphor of asteroid breakup. By simulating the breakup and fragment reassembly of asteroids under high-speed rotation, ARBO enables efficient exploration of complex search spaces.
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