Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360001b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #600.01
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present lightcurves of Centaurs (32532) Thereus and (8405) Asbolus from observations taken October 29 through November 2, 2005 on the 1.8m Vatican Advanced Technology Telescope (VATT). Our double-peaked period for Thereus of 8.338±0.002h is consistent with 8.3378±0.0012h from Farnham and Davies (2003 Icarus 164, 418-427), 8.3091±0.0001h from Ortiz et al. (2002 A&A 388, 661-666; 2003 A&A 407, 1149-1155), and 8.33858±0.00056h from Rabinowitz et al. (2007 AJ 133, 26-43). The maximum amplitude of the lightcurve has increased from 0.18mag in Fall 2001 (Ortiz et al. 2002, Farnham and Davies 2003) to 0.34±0.08mag in Fall 2003 (Rabinowitz et al. 2007) to 0.375mag in Fall 2005. For Asbolus, our double-peaked period is 8.932±0.002h, consistent with the period of 8.9351±0.0003h derived by Davies et al. (1998 Icarus 134, 213-227) but inconsistent with the period of 8.87±0.02h of Brown and Luu (1997 Icarus 126, 218-224). Asbolus's lightcurve amplitude has changed from 0.46 in April 1996 (Brown and Luu 1997) to 0.14±0.02 in June 2001 (Kern 2006, PhD Dissertation, MIT, Cambridge, MA) and 0.14±0.1 in Fall 2003 (Rabinowitz et al. 2007) to 0.32 in Fall 2005. We assume that changes in amplitude are due to changes in viewing aspects with respect to their rotational axes. Future work: determine amplitudes from October 2008 observations and constrain rotational pole positions and axis ratios for both Centaurs with an amplitude-aspect model.
This work is based on observations with the VATT: The Alice P. Lennon Telescope and the Thomas J. Bannan Astrophysics Facility. We gratefully acknowledge support from NASA Planetary Astronomy grant NNG06G138G to Northern Arizona University and the University of Oklahoma.
Song J.
Brucker Melissa
Consolmagno Guy J.
Romanishin W. J.
Tegler Stephen C.
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