Results 211 to 220 of about 13,644 (233)

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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Primary Rotations of Paired Asteroids

2009
A population of small main-belt asteroids residing on closely similar orbits was revealed by Vokrouhlicky and Nesvorny (2008, Astron. J. 136, 280-290). We have estimated statistical significances of individual pairs (Pravec and Vokrouhlicky 2009, Icarus, in press) and started a photometry observing program to characterize their spin properties ...
Pravec, Petr, Vokrouhlický, D., Polishook, David, Harris, Alan W., Galád, Adrián, Vaduvescu, Ovidiu, Pozo, F. N., Barr, A., Longa, P., Colas, François, Marchis, Franck, Macomber, B., Pollock, Joseph T., Pray, D. P.   +13 more
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Rotational fission of contact binary asteroids

Icarus, 2007
The energetics and dynamics of contact binary asteroids as they approach and pass the rotational fission limit is studied. We presume that the asteroids are subject to an external torque, such as from the YORP effect, that increases their angular momentum.
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Asteroid Rotational Disruption Optimization

Rotational disruption of asteroids is a crucial dynamical phenomenon in astrophysics. It occurs when an asteroid accelerates its rotation or increases its angular momentum, causing it to break apart or fragment due to its own gravity and material strength being unable to maintain its overall structure.
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