Lightcurves of 12 NEAs Virtual Observatory Resource

Authors
  1. Kwiatkowski T.
  2. Polinska M.
  3. Loaring N.
  4. Buckley D.A.H.
  5. O'Donoghue D.,Kniazev A.
  6. Romero Colmenero E.
  7. Published by
    CDS
Abstract

Very small asteroids (VSAs) are thought to be the building blocks of larger asteroids and, as such, are interesting to study. Many of these monolithic or deeply fractured objects display rapid rotations with periods as short as several minutes. Observations of such asteroids can reveal their spin limits, which can be related to the tensile strength of their interiors. The evolution of the spins of these objects is primarily shaped by the YORP effect, the theory of which needs comparison with observations. With the 10m SALT telescope, we observed VSAs belonging to near-Earth asteroids. The obtained lightcurves were used to derive synodical periods of rotation, amplitudes, and elongations of these bodies. Results for 14 rapidly rotating asteroids were reported in the first paper in this series. Here we show lightcurves of 2 fast rotators, 9 objects with periods >=1h, and a possible non-principal axis rotator. We also list negative detections that most probably indicate asteroids with long periods and/or low amplitudes. Combining our results with the data from the literature, we obtain a set of 79 near-Earth VSAs with a median period of 0.25h (15min). By adjusting the spin limits predicted by theory to those observations, we find tentative evidence that the tensile strengths of VSAs, after scaling them to the same size, are of the same order as the minimum tensile strengths of stony meteoroids that undergo fragmentation under the atmospheric load.

Keywords
  1. surveys
  2. solar-system
  3. asteroids
  4. ccd-photometry
Bibliographic source Bibcode
2010A&A...511A..49K
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/511/A49
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/511/A49
Document Object Identifer DOI
doi:10.26093/cds/vizier.35110049

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/511/A49
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History

2010-04-19T13:44:26Z
Resource record created
2010-04-19T13:44:26Z
Created
2018-02-02T10:34:12Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr