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Spins, shapes, and orbits for near-Earth objects by Nordic NEON

Published online by Cambridge University Press:  01 August 2006

Karri Muinonen ,
Johanna Torppa ,
Jenni Virtanen ,
Jyri Näränen ,
Jarkko Niemel ,
Mikael Granvik ,
Teemu Laakso ,
Hannu Parviainen ,
Kaare Aksnes  and
Zhang Dai
...Show all authors
Karri Muinonen
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi Present address: Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014 University of Helsinki, Finland.
Johanna Torppa
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Jenni Virtanen
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Jyri Näränen
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Jarkko Niemel
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Mikael Granvik
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Teemu Laakso
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Hannu Parviainen
Affiliation:
Observatory, Kopernikuksentie 1, P.O. Box 14, FI-00014University of Helsinki, Finland email: Karri.Muinonen@helsinki.fi
Kaare Aksnes
Affiliation:
University of Oslo, Institute of Theoretical Astrophysics, PB 1029 Blindern, 0315 Oslo, Norway
Zhang Dai
Affiliation:
University of Oslo, Institute of Theoretical Astrophysics, PB 1029 Blindern, 0315 Oslo, Norway
Claes Ingvar Lagerkvist
Affiliation:
Uppsala Astronomical Observatory, Box 515, S-75120 Uppsala, Sweden
Hans Rickman
Affiliation:
Uppsala Astronomical Observatory, Box 515, S-75120 Uppsala, Sweden
Ola Karlsson
Affiliation:
Uppsala Astronomical Observatory, Box 515, S-75120 Uppsala, Sweden
Gerhard Hahn
Affiliation:
German Aerospace Center (DLR), Institute of Planetary Research, Rutherfordstrasse 2, D-12489 Berlin, Germany
René Michelsen
Affiliation:
Ørsted DTU, Technical University of Denmark, Elektrovej, bldg. 327, DK-2800 Kgs. Lyngby, Denmark
Tommy Grav
Affiliation:
University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, Hawaii 96822-1897, USA
Petr Pravec
Affiliation:
Astronomical Institute AV CR, Fricova 298, 25165 Ondrejov, Czech Republic
Uffe Gråe Jørgensen
Affiliation:
Astronomical Observatory, Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
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Abstract

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The observing program of the Nordic Near-Earth-Object Network (NEON) accrues knowledge about the physical and dynamical properties of near-Earth objects (NEOs) using state-of-the-art inverse methods. Photometric and astrometric observations are being carried out at the Nordic Optical Telescope. Here, the NEON observations from June 2004–September 2006 are reviewed. Statistical orbital inversion is illustrated by the so-called Volume-of-Variation method. Statistical inversion for spins and shapes is carried using a simple triaxial shape model yielding analytical disk-integrated brightnesses for both Lommel-Seeliger and Lambert scattering laws. The novel approach allows spin-shape error analyses with the help of large numbers of sample solutions. Currently, such spin-shape solutions have been derived for 2002 FF12, 2003 MS2, 2003 RX7, and 2004 HW. For (1862) Apollo, an unambiguous spin-shape solution has been obtained using the conventional, convex inversion method and, for (1685) Toro and (1981) Midas, the conventional method has been applied repeatedly to map the regime of possible solutions.

Keywords

Identificationstatistical methodsdata analysisastrometryphotometryasteroid, rotationasteroid, lightcurves
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S236: Near Earth Objects, our Celestial Neighbors: Opportunity and Risk , August 2006 , pp. 309 - 320
Copyright
Copyright © International Astronomical Union 2007

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