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Spins and Shapes of Potentially Hazardous Asteroids

Torppa, Johanna und Aksnes, Kaare und Dai, Z. und Grav, Tommy und Hahn, Gerhard und Laasko, T. und Lagerkvist, Claes-Ingvar und Muinonen, Karri und Niemelä, J. und Näränen, J. und Rickman, Hans und Virtanen, Jenni (2005) Spins and Shapes of Potentially Hazardous Asteroids. In: Bulletin of the American Astronomical Society, 37 (3), . American Astronomical Society. 37th DPS Meeting, 2005-09-04 - 2005-09-09, Cambridge, (UK). ISSN 0002-7537

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Offizielle URL: http://www.aas.org/publications/baas/v37n3/dps2005/477.htm

Kurzfassung

Asteroids whose orbits lie close to that of the Earth (called near-Earth objects) are a threat to our planet. Though none of the known asteroids are currently on a collision course with the Earth, there is a class called potentially hazardous asteroids (PHA's) whose orbits may in a few tens of years be perturbed to make a collision possible. In such case, we should have thorough knowledge of the physical properties of these objects because, unlike most other natural disasters, such a hazard is in principle avoidable. Thus in the fall of 2003, a group of asteroid and comet researchers from the Nordic countries have set started an observing program called Nordic NEON (Nordic Near-Earth Object Network). Both photometric and astrometric observations of PHA's have been carried out since April 2004. Photometry is used for determining the spin state and shape of PHA's and astrometry for computing more accurate orbits. In this DPS meeting we will concentrate on the photometric part of the program. We use methods developed in the University of Helsinki for analysing both kinds of data. Spin state and convex shape solution are obtained using the convex inversion method described in [1] and information of the nonconvex shape features are obtained with the spherical harmonics method (Muinonen and Torppa, in preparation). For initial period estimation only a few nights of observations is usually enough, while pole and shape determination requires more abundant data. Previously observed photometric data exists for about 35 PHA's, but only an approximate period is known for most of these. Properties of well over 500 PHA's are totally unknown. So far we have obtained period estimates for 4 new PHA's, and improved spin and shape solution for 3 targets. A number of foundations and universities from all the participating countries have taken part in funding this project.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Spins and Shapes of Potentially Hazardous Asteroids
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Torppa, JohannaUniversity of Helsinki
Aksnes, KaareUniversity of Oslo
Dai, Z.University of Oslo
Grav, TommyUniversity of Hawaii
Hahn, GerhardNICHT SPEZIFIZIERT
Laasko, T.University of Helsinki
Lagerkvist, Claes-IngvarUniversity of Uppsala
Muinonen, KarriUniversity of Helsinki
Niemelä, J.University of Helsinki
Näränen, J.University of Helsinki
Rickman, HansUniversity of Uppsala
Virtanen, JenniUniversity of Helsinki
Datum:2005
Erschienen in:Bulletin of the American Astronomical Society
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:37
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:37th DPS Meeting
Veranstaltungsort:Cambridge, (UK)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-09-04 - 2005-09-09
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 20:14

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