ASTEROID SIZING BY RADIOGALAXY OCCULTATION AT 5 GHZ

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http://hdl.handle.net/10138/183627

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Lehtinen , K , Bach , U , Muinonen , K , Poutanen , M & Petrov , L 2016 , ' ASTEROID SIZING BY RADIOGALAXY OCCULTATION AT 5 GHZ ' , Astrophysical Journal Letters , vol. 822 , no. 2 , 21 . https://doi.org/10.3847/2041-8205/822/2/L21

Title: ASTEROID SIZING BY RADIOGALAXY OCCULTATION AT 5 GHZ
Author: Lehtinen, K.; Bach, U.; Muinonen, K.; Poutanen, M.; Petrov, L.
Contributor: University of Helsinki, Department of Physics
Date: 2016-05-10
Language: eng
Number of pages: 5
Belongs to series: Astrophysical Journal Letters
ISSN: 2041-8205
URI: http://hdl.handle.net/10138/183627
Abstract: Stellar occultations by asteroids observed at visual wavelengths have been an important tool for studying the size and shape of asteroids and for revising the orbital parameters of asteroids. At radio frequencies, a shadow of an asteroid on the Earth is dominated by diffraction effects. Here, we show, for the first time, that a single observation of an occultation of a compact radio source at a frequency of 5 GHz can be used to derive the effective size of the occulting object and to derive the distance between the observer and the center of the occultation path on the Earth. The derived diameter of the occulting object, asteroid (115) Thyra, is 75 +/- 6 km. The observed occultation profile shows features that cannot be explained by diffraction of a single asteroid.
Subject: minor planets, asteroids: individual (Thyra)
occultations
MAIN BELT ASTEROIDS
STELLAR OCCULTATIONS
CATALOG
115 Astronomy, Space science
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