EDP Sciences
Free access
Volume 388, Number 2, June III 2002
Page(s) 661 - 666
Section The solar system
DOI http://dx.doi.org/10.1051/0004-6361:20020487

A&A 388, 661-666 (2002)
DOI: 10.1051/0004-6361:20020487

Lightcurves of Centaurs 2000 QC $\mathsf{_{243}}$ and 2001 PT $\mathsf{_{13}}$

J. L. Ortiz1, S. Baumont2, P. J. Gutiérrez1 and M. Roos-Serote3

1  Instituto de Astrofísica de Andalucia, CSIC, Granada, Spain
2  Institut d'Optique Théorique et Appliquée, 91403 Orsay, France
3  Centre for Astronomy and Astrophysics of the University of Lisbon / Lisbon Astronomical Observatory, Tapada da Ajuda, 1349-018 Lisbon, Portugal
    e-mail: roos@oal.ul.pt

(Received 4 February 2002 / Accepted 28 March 2002 )

We present CCD photometric observations of Centaurs 2000 QC 243 and 2001 PT 13. For 2000 QC 243, a large amplitude period is found at $4.57\,{\rm h}\pm 0.05\,{\rm h}$, which likely corresponds to half the rotation period of the body, or coincides with the full rotation period, depending on whether the variability is induced by an irregular shape or by albedo features. The apparent double-peaked lightcurve favors the first interpretation. The large amplitude of the oscillations imply a very irregular shape for this object or a large albedo assymmetry between the two hemispheres. For 2001 PT 13, a clear period of $4.15\,{\rm h} \pm 0.05\,{\rm h}$ was detected, with an amplitude of 0.16 mag. Since 4.15 h is close to the breakup limit for typical cometary densities and tensile strengths, 8.3 h appears to be a more likely rotation period.

Key words: minor planets, asteroids -- Kuiper Belt

Offprint request: J. L. Ortiz, ortiz@iaa.es

© ESO 2002