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A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids

Dahlgren, M. and Lahulla, J.F. and Lagerkvist, C.-I. and Lagerros, J. and Mottola, S. and Erikson, A. and Gonano-Beurer, M. and Di Martino, M. (1998) A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids. Icarus, 133, pp. 247-285.

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Abstract

The results of a photometric survey of Hilda asteroids are presented. We have obtained 224 lightcurves of 47 Hilda asteroids. A wide span of rotation periods have been found, ranging from 2.851 to 31 h. However, indications of rotation periods longer than 100 h were found for two objects. The largest lightcurve amplitude found is 1.38 mag, and 13 additional objects have observed amplitudes >=0.30 mag. Improved absolute magnitudes have been obtained for 20 objects as well as new V-R color indices for 17 of these. Improved albedos, derived from the new absolute magnitudes, have been obtained for 10 Hilda asteroids. The V-R color indices range between 0.38 and 0.49 mag, indicating that only P- and D-type asteroids are present among these asteroids. A probable taxonomy was assigned to four Hilda asteroids (one P-type and three D-types) which previously were unclassified. The Hilda Asteroid 3694 Sharon was observed at low solar phase angles, and the obtained lightcurves indicate a reduced to nonexisting opposition effect for this asteroid. One Hilda asteroid, 2067 Aksnes, may be in a state of precession as no satisfactory two-maxima and two-minima lightcurve could be fitted to the data. However, the short damping time scale makes this very unlikely. This favours a four-maxima and four-minima lightcurve of 2067 Aksnes, which is a better fit to the data than a two-maxima and two-minima lightcurve. The Hilda Asteroid 3415 Danby has a very short rotation period (P = 2.851 +/- 0.003 h), making Danby the fastest spinning asteroid known within its size range (D ~ 50 km). Due to its fast spin some constraints can be set on 3415 Danby's internal structure and mean density. The assumption that 3415 Danby is a rubble-pile, with its shape governed by hydrostatic equilibrium, leads to an unrealistically high mean density. On the other hand, assuming that 3415 Danby has internal strength results in a mean density larger than 1.4 g cm^-3.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids
Authors:
AuthorsInstitution or Email of Authors
Dahlgren, M.Astronomical Observatory, Uppsala, Sweden
Lahulla, J.F.Observatorio Astronomico, Madrid, Spain
Lagerkvist, C.-I.Astronomical Observatory, Uppsala, Sweden
Lagerros, J.Astronomical Observatory, Uppsala, Sweden
Mottola, S.UNSPECIFIED
Erikson, A.UNSPECIFIED
Gonano-Beurer, M.UNSPECIFIED
Di Martino, M.Osservatorio di Torino, Pino Torinese, Torino, Italy
Date:1998
Journal or Publication Title:Icarus
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:133
Page Range:pp. 247-285
Status:Published
Keywords:asteroids, photometry, asteroids rotation
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):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: Susanne Pieth
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:04

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