Detectability of YORP rotational slowing of asteroid 25143 Itokawa
David VokrouhlickýInstitute of Astronomy, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic e-mail: [email protected], [email protected]D. ČapekInstitute of Astronomy, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic e-mail: [email protected], [email protected]M. KaasalainenRolf Nevanlinna Institute, University of Helsinki, PO Box 4, 00014 Helsinki, Finland, and Sodankyla Geophysical Observatory, University of Oulu, Tahtelantie 62, 99600 Sodankyla, Finland e-mail: [email protected]S. J. OstroJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA e-mail: [email protected]
2004en
ABI
Аннотация
We predict that the YORP thermal-emission effect can be directly detected through a measurable increase in the rotation period of the several-hundred-meter near-Earth asteroid 25143 Itokawa. The fractional change of Itokawa's rotation rate in between 2001 and 2004 should be , significantly larger than its currently estimated uncertainty . The corresponding change of sidereal rotation phase, normalized to unity in a cycle, is in January 2004, producing h delay of lightcurve maximum.
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