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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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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.

Item URL in elib:https://elib.dlr.de/10670/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dahlgren, M.Astronomical Observatory, Uppsala, SwedenUNSPECIFIEDUNSPECIFIED
Lahulla, J.F.Observatorio Astronomico, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Lagerkvist, C.-I.Astronomical Observatory, Uppsala, SwedenUNSPECIFIEDUNSPECIFIED
Lagerros, J.Astronomical Observatory, Uppsala, SwedenUNSPECIFIEDUNSPECIFIED
Di Martino, M.Osservatorio di Torino, Pino Torinese, Torino, ItalyUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 247-285
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: Pieth, Susanne
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:04

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