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

Muinonen, Karri and Virtanen, Jenni and Torppa, Johanna and Granvik, Mikael and Näränen, J. and Aksnes, Kaare and Grav, Tommy and Hahn, Gerhard and Lagerkvist, Claes-Ingvar and Rickman, Hans and Michelsen, Rene (2004) Physical and Dynamical Characterization of Near-Earth Objects by the NEON Program. In: Bulletin of the American Astronomical Society, 36 (4), abstract289. American Astronomical Society. 36th DPS Meeting, 2004-11-08 - 2004-11-12, Louisville, KY (USA). ISSN 0002-7537

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

Abstract

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).

Document Type:Conference or Workshop Item (Speech)
Title:Physical and Dynamical Characterization of Near-Earth Objects by the NEON Program
Authors:
AuthorsInstitution or Email of Authors
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, GerhardUNSPECIFIED
Lagerkvist, Claes-IngvarUppsala Univ. Astronomical Observatory
Rickman, HansUppsala Univ. Astronomical Observatory
Michelsen, ReneUniv. Copenhagen Astronomical Observatory
Date:2004
Journal or Publication Title:Bulletin of the American Astronomical Society
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:36
Page Range:abstract289
Editors:
EditorsEmail
Milkey, Robert W.UNSPECIFIED
Publisher:American Astronomical Society
ISSN:0002-7537
Status:Published
Keywords:asteroids
Event Title:36th DPS Meeting
Event Location:Louisville, KY (USA)
Event Type:international Conference
Event Dates:2004-11-08 - 2004-11-12
Organizer:American Astronomical Society - Division for Planetary Sciences
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Dr.phil. Gerhard Hahn
Deposited On:01 Dec 2005
Last Modified:14 Jan 2010 20:15

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