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Physical and Dynamical Characterization of Near-Earth Objects by the NEON Program

Muinonen, Karri und Virtanen, Jenni und Torppa, Johanna und Granvik, Mikael und Näränen, J. und Aksnes, Kaare und Grav, Tommy und Hahn, Gerhard und Lagerkvist, Claes-Ingvar und Rickman, Hans und Michelsen, Rene (2004) Physical and Dynamical Characterization of Near-Earth Objects by the NEON Program. In: Bulletin of the American Astronomical Society, 36 (4), . American Astronomical Society. 36th DPS Meeting, 2004-11-08 - 2004-11-12, Louisville, KY (USA). ISSN 0002-7537

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Offizielle URL: http://www.aas.org/publications/baas/v36n4/dps2004/289.htm

Kurzfassung

In order to accrue knowledge on the physical and dynamical properties of near-Earth objects (NEOs), the recently established Nordic Near-Earth-Object Network (NEON) carries out a long-term photometric and astrometric NEO observing program at the 2.56-m Nordic Optical Telescope on La Palma (http://www.astro.helsinki.fi/~psr/NEO/not_obs.html). The spin vector, shape, and surface properties of an individual NEO are estimated from photometric observations at varying observation and illumination geometries. Improved orbits---including potential collision orbits with the Earth---can be derived from sky-plane positions available from the dedicated astrometry or the photometric observations. We have developed novel algorithms for statistical inversion of an object's shape from lightcurves and/or sparsely distributed photometric observations. The algorithms allow the computation of shapes starting from a single observed lightcurve and yield a complete error analysis of the spins and shapes obtained. Note that when only small numbers of observations are available the spectrum of potential spins and shapes is wide. As to the astrometric component of the program, we concentrate on potentially hazardous NEOs in need of a few additional observations to secure their recovery in the subsequent apparition. As one goal of the astrometric component, we aim at obtaining R-band photometry for each observed object. In the long run, this will provide us information of the true NEO absolute magnitude and size distributions greatly improving the impact risk estimation. As of 2004 Sept. 1, NEON has made photometric observations of seven NEOs: (1917) Cuyo, (2061) Anza, 2001 US16, (68950) 2002 GF15, 2003 RX7, 2004 LJ1, and 2004 HW. Making use of the new observations, we show up-to-date models for the spins and shapes of these objects. NEON has made astrometric observations of more than 30 NEOs in urgent need of additional positions---these observations have culminated in the recovery of 1998 VN (MPEC 2004-M30).

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Physical and Dynamical Characterization of Near-Earth Objects by the NEON Program
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Muinonen, KarriUniv. Helsinki Observatory
Virtanen, JenniUniv. Helsinki Observatory
Torppa, JohannaUniv. Helsinki Observatory
Granvik, MikaelUniv. Helsinki Observatory
Näränen, J.Nordic Optical Telescope, La Palma
Aksnes, KaareUniv. Oslo Institute for Theoretical Astrophysics
Grav, TommyUniv. Oslo Institute for Theoretical Astrophysics
Hahn, GerhardNICHT SPEZIFIZIERT
Lagerkvist, Claes-IngvarUppsala Univ. Astronomical Observatory
Rickman, HansUppsala Univ. Astronomical Observatory
Michelsen, ReneUniv. Copenhagen Astronomical Observatory
Datum:2004
Erschienen in:Bulletin of the American Astronomical Society
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:36
Seitenbereich:
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Milkey, Robert W.NICHT SPEZIFIZIERT
Verlag:American Astronomical Society
ISSN:0002-7537
Status:veröffentlicht
Stichwörter:asteroids
Veranstaltungstitel:36th DPS Meeting
Veranstaltungsort:Louisville, KY (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-11-08 - 2004-11-12
Veranstalter :American Astronomical Society - Division for Planetary Sciences
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Dr.phil. Gerhard Hahn
Hinterlegt am:01 Dez 2005
Letzte Änderung:14 Jan 2010 20:15

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