Detection of the YORP Effect from Photometric
Observations of Near-Earth Asteroids
Yu. N. Krugly1, N. M. Gaftonyuk2, J. Durech3, D. Vokrouhlicky3,
M. Kaasalainen4, V. G. Shevchenko1, M. A. Ibrahimov5, A. L. Marshalkina5,
V. V. Rumyantsev2, I. E. Molotov6, Z. Donchev7, V. Ivanova7, A. V. Sergeyev1,
N. Tungalag8
1V. N. Karazin Kharkiv National University, Kharkiv, Ukraine
2Scientific Research Institute Crimean Astrophysical Observatory,
Nauchnyj, Ukraine
3Astronomical Institute of Charles University, Prague, Czech Republic
4Department of Mathematics and Statistic of Rolf Nevanlinna Institute of Universi-ty of Helsinki, Helsinki, Finland
5Ulugh Beg Astronomical Institute of Uzbek Academy of Sciences,
Tashkent, Uzbekistan
6Keldysh Institute of Applied Mathematics of RAS, Moscow, Russia
7Institute of Astronomy of Bulgarian Academy of Sciences, Sofia, Bulgaria
8Research Center for Astronomy and Geophysics of Mongolian Academy of Sci-ence, Ulanbator, Mongolia
Abstract:
In this report we present summary of photometric observations of near-Earth asteroids (NEAs) obtained to search for YORP effect. New additional observations of 1862 Apollo in 2007 have confirmed YORP detection. Observations of 1620 Geographos in 2008 and 3103 Eger in 2009 are used to detect the acceleration of the asteroids rotation rates in agreement with the computed theoretical values due to YORP effect. Now there are four asteroids with the YORP effect detected. Rotation periods for co-orbital NEAs 138175 2000 EE104 and 138852 2000 WN10 are determined for the first time.
Key words:
Very Long Baseline Interferometry (VLBI), Small Solar System Body (SSSB),
Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, asteroids,
YORP detection, photometric observations, near-Earth asteroids (NEAs),
observations of 1862 Apollo in 2007, observations of 1620 Geographos in 2008,
observations of 3103 Eger in 2009, acceleration of the asteroids rotation,
rotation period for co-orbital NEAs 138175 2000 EE104, rotation period for
co-orbital NEAs 138852 2000 WN10.