Physical Characterization Of 2002 Ve68, A Quasi-moon Of Venus.

Details Physical Characterization Of 2002 Ve68, A Quasi-moon Of Venus. Physical Characterization Of 2002 Ve68, A Quasi-moon Of Venus.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822402b&link_type=abstract

American Astronomical Society, AAS Meeting #218, #224.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The Near-Earth Object (NEO) 2002 VE68 was discovered by the LONEOS Survey on November 11, 2002 (MPEC 2002-V52). With a semi-major axis of 0.723 AU, 2002 VE68 is in a 1:1 mean motion resonance with Venus and can be considered a quasi-satellite of the planet. Orbital integrations by Mikkola et al. (2004) suggest that 2002 VE68 was likely an NEO injected into its current orbit by a close Earth encounter approximately 7000 years ago and will remain a Venusian quasi-satellite for another 500 years. This object has been designated a Potentially Hazardous Asteroid by the Minor Planet Center. We took advantage of the object's 2010 apparition to collect rotationally resolved Bessel BVRI photometry over the course of three nights (November 10/12/13 2010) using the JPL Table Mountain 0.6-m telescope near Wrightwood, California. The object's mean colors (B-R=1.106+/-0.019 mag; V-R=0.419+/-0.021 mag; R-I=0.348+/-0.014 mag) are most compatible with an X-type spectral classification (Bus Taxonomy). A slight reflectance dip at 0.55 micron is consistent with the deep 0.50 micron feature observed in the spectrum of the E-type asteroid 2867 Steins (Weissman et al. 2008). The spectral resolution that our BVRI photometry affords is often insufficient to resolve the E-M-P sub-classes within the X-spectral complex (Tholen Taxonomy; Zelner et al. 1985). After converting the photometry from magnitude to flux units, we found a best-fit synodic period P_syn = 13.50+/-0.01 hr. Our photometry yields an absolute magnitude H_v=20.59+/-0.02 mag, implying an effective diameter D 200m (rho=0.25). The lightcurve amplitude of 2002 VE68 ( 0.9 mag) suggests that it may be a contact binary.

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