M. D. Hicks and J. M. Bauer, Jet Propulsion Laboratory, California Institute of Technology; and and A. T. Tokunaga, Institute for Astronomy, University of Hawaii, write that they obtained BVRI photometry of minor planet (2867), a Rosetta flyby target, during Mar. 27 and 28 UT at the Table Mountain Observatory 0.6-m telescope. The minor planet exhibited a double-peaked lightcurve with a period of 6.06 +/- 0.05 hr and amplitude 0.2 mag, corresponding to a maximum a/b triaxial ratio of 0.8. Assuming G = 0.15 for the phase-function slope parameter, averaged absolute magnitudes of 12.67 +/- 0.02 in R and 13.18 +/- 0.04 in V are derived. Hicks et al. add that the measured colors of B-R = +1.311 +/- 0.026, V-R = +0.513 +/- 0.029, and R-I = +0.440 +/- 0.030 cannot rule out a D-type taxonomic classification but are more suggestive of an S-type asteroid.
International Astronomical Union Circular
- Pub Date:
- April 2004