Warner Brian D, Pollock Joseph T, Reichart Daniel E, Haislip Joshua B, LaCluyze Aaron P, Verveer Arie, Spuck Tim, Harris Alan W
Center for Solar System Studies - Palmer Divide Station, (CS3-PDS), 446 Sycamore Ave., Eaton, CO 80615 USA.
Department of Physics and Astronomy, Appalachian State University, Boone, NC USA.
Minor Planet Bull. 2015 Jan-Mar;42(1):37-38.
Analysis of CCD photometric observations of the near-Earth asteroid (399307) 1991 RJ2 made in 2014 August-September show it to be a binary system with a primary period of 3.4907 ± 0.0002 h and orbital period of 15.917 ± 0.001 h. The depth of the secondary indicates a minimum effective diameter ratio (Ds/Dp) of 0.47 ± 0.02. The lightcurve showing the orbital period and indicates a slightly elongated (a/b ~ 1.07/1.0) satellite that is tidally-locked to the orbital period.
