New photometric observations of asteroids (1862) Apollo and (25143) Itokawa – an analysis of YORP effect
Josef ĎurechAstronomical Institute, Charles University in Prague, V Holešovičkách 2, 18000 Prague, Czech Republic e-mail: [email protected]David VokrouhlickýAstronomical Institute, Charles University in Prague, V Holešovičkách 2, 18000 Prague, Czech Republic e-mail: [email protected]M. KaasalainenDepartment of Mathematics and Statistics, Rolf Nevanlinna Institute, PO Box 68, 00014 University of Helsinki, FinlandP. R. WeissmanScience Division, Jet Propulsion Laboratory, 4800 Oak Grove Drive, MS 183-301, Pasadena, CA 91109, USAS. C. LowryScience Division, Jet Propulsion Laboratory, 4800 Oak Grove Drive, MS 183-301, Pasadena, CA 91109, USAE. C. BeshoreLunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, USADavid HigginsHunters Hill Observatory, 7 Mawalan Street, Ngunnawal ACT 2913, AustraliaYu. N. KruglyInstitute of Astronomy of Kharkiv National University, Sumska str. 35, Kharkiv 61022, UkraineV. G. ShevchenkoInstitute of Astronomy of Kharkiv National University, Sumska str. 35, Kharkiv 61022, UkraineN. M. GaftonyukCrimean Astrophysical Observatory, Simeiz 98680, UkraineYoung‐Jun ChoiKorea Astronomy & Space Science Institute, 61-1 Hwa-am Dong, Yuseong Gu, Daejon 305-348, South KoreaR. A. KowalskiLunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, USAS. M. LarsonLunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, USAB. WarnerPalmer Divide Observatory, Colorado Springs, Colorado 80908, USAA. L. MarshalkinaUlugh Beg Astronomical Institute, Uzbek Academy of Sciences, Astronomicheskaya 33, Tashkent 100052, UzbekistanM. IbrahimovUlugh Beg Astronomical Institute, Uzbek Academy of Sciences, Astronomicheskaya 33, Tashkent 100052, UzbekistanI. MolotovKeldysh Institute of Applied Mathematics, RAS, Miusskaya sq. 4, Moscow 125047, RussiaTadeusz MichałowskiAstronomical Observatory, Adam Mickiewicz University, Słoneczna 36, 60-286 Poznań, PolandK. KitazatoDepartment of Earth and Planetary Science, The University of Tokyo, Bynkyo-ku, Tokyo 113-0033, Japan
ABI
Abstract
Aims. Asteroid (1862) Apollo is one of two asteroids in which the YORP effect was detected. We carried out new photometric observations of Apollo in April 2007 to enlarge the time line and to derive a more precise shape and spin state model. We also observed another YORP-candidate, asteroid (25143) Itokawa, in December 2006 and January 2007 to obtain a longer time line. An estimation of the YORP strength on Itokawa based on its precise shape model from the Hayabusa mission predicted the deceleration to be already observable during the 2007 apparition.
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