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The shape and rotation of the tumbling asteroid (99942) Apophis
Scheirich, P.; Pravec, P.; Durech, J. et al.
2014In Muinonen, Karri (Ed.) Asteroids, Comets, Meteors 2014
 

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Keywords :
asteroid; apophis; solar system
Abstract :
[en] Photometric observations of the asteroid (99942) Apophis taken from December 2012 to April 2013 revealed that it is in a non-principal axis rotation state. We constructed a numerical model of the asteroid's shape and rotation. The asteroid is in a short-axis mode (SAM) of excited rotation. The precession and rotation periods are P_φ = 27.38 ± 0.07 h and P_ψ = 263 ± 6 h, respectively. The rotation is retrograde with the angular momentum vector's ecliptic longitude and latitude of 250° and -75° (the uncertainty area is approximately an ellipse with the major and minor semiaxes of 27° and 14°, respectively). The shape of the asteroid is dynamically close to a prolate ellipsoid, with the lengths of largest and intermediate axes of 1.64 ± 0.09 and 1.14^{+0.04}_{-0.08}, respectively (the shortest axis is normalized to unity); the largest and intermediate moments of inertia differ by 3-4
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Scheirich, P.
Pravec, P.
Durech, J.
Pollock, J.
Kusnirak, P.
Hornoch, K.
Galad, A.
Jehin, Emmanuel  ;  Université de Liège - ULiège
Manfroid, Jean  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Opitom, Cyrielle ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Gillon, Michaël  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Colas, F.
Oey, J.
Vrastil, J.
Reichart, D.
Ivarsen, K.
Haislip, J.
LaCluyze, A.
Penttilä, A.
Granvik, M.
Virkki, A.
Fedorets, G.
Wilkman, O.
Kohout, T.
More authors (14 more) Less
Language :
English
Title :
The shape and rotation of the tumbling asteroid (99942) Apophis
Publication date :
01 July 2014
Event name :
Asteroids, Comets, Meteors 2014
Event place :
Helsinki, Finland
Event date :
June 30th – July 4th 2014
Audience :
International
Main work title :
Asteroids, Comets, Meteors 2014
Author, co-author :
Muinonen, Karri
Publisher :
University Helsinki, Helsinki, Finland
ISBN/EAN :
978-952-10-8962-6
Pages :
474
Available on ORBi :
since 12 January 2016

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