'Plymouth Rock' Human Asteroid Trek Proposed for 2019, Ken Kremer
"'Plymouth Rock' is the name of an ambitious new concept for an early human mission to explore a Near Earth Asteroid using dual Orion manned spacecraft. Two astronauts would embark on a six month round trip Asteroid Trek as soon as 2019 - before the end of this decade. The recent discovery of a new class of many small asteroids - 5 to 75 meters wide - has enabled the formulation of this potential new destination for deep space human exploration in the near term. Favorable orbital alignments occur only a few times per decade."
Keith's note: a white paper describing this Lockheed Martin mission concept is online here.