Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu.

Authors :: Chesley, Steven R.
Farnocchia, Davide
Nolan, Michael C.
Vokrouhlický, David
Chodas, Paul W.
Milani, Andrea
Spoto, Federica
Rozitis, Benjamin
Benner, Lance A.M.
Bottke, William F.
Busch, Michael W.
Emery, Joshua P.
Howell, Ellen S.
Lauretta, Dante S.
Margot, Jean-Luc
Taylor, Patrick A.
Source :: ICARUS. Jun2014, Vol. 235, p5-22. 18p.
Publication Year :: 2014
Abstract: Highlights: [•] Asteroid Bennu has a well-determined orbit due primarily to 12years of radar ranging. [•] The Yarkovsky effect on Bennu causes a semimajor axis drift of 284±1.5m/year. [•] We estimate Bennu’s bulk density at 1260±70kg/m3 and macroporosity 40±10%. [•] Bennu has a 1 in 2700 chance of an Earth impact late in the 22nd century. [ABSTRACT FROM AUTHOR]