Мақола

Direct Detection of the Yarkovsky Effect by Radar Ranging to Asteroid 6489 Golevka

Steven R. ChesleyArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAS. J. OstroArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USADavid VokrouhlickýArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAD. ČapekArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAJon D. GiorginiArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAM. C. NolanArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAJean‐Luc MargotArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAA. A. HineArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAL. A. M. BennerArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USAA. B. ChamberlinArecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, PR 00612, USA

2003en

ABI

Аннотация

Radar ranging from Arecibo, Puerto Rico, to the 0.5-kilometer near-Earth asteroid 6489 Golevka unambiguously reveals a small nongravitational acceleration caused by the anisotropic thermal emission of absorbed sunlight. The magnitude of this perturbation, known as the Yarkovsky effect, is a function of the asteroid's mass and surface thermal characteristics. Direct detection of the Yarkovsky effect on asteroids will help constrain their physical properties, such as bulk density, and refine their orbital paths. Based on the strength of the detected perturbation, we estimate the bulk density of Golevka to be \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(2.7_{-0.6}^{+0.4}\) \end{document} grams per cubic centimeter.

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DOI: 10.1126/science.1091452

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