2013 "First Edition: June 2013" stated on copyright page; Tom Doherty Associates publishers, New York; hardbound; very good condition with unmarked pages; dust jacket very good.
 
goodreads review -
A visionary new tale from Larry Niven and Matthew Joseph Harrington

The year is 2052 and Dr. Toby Glyer has effected miracle cures with the use of nanotechnology. But Glyer’s controversial nanites are living things—a new form of life—and they have more uses than just medical. They also have the potential to make everyone on Earth rich from the wealth of asteroids…if he can control them.

Unfortunately, as every parent learns, when you produce a new, thinking being, the plans it makes are not necessarily your plans. And when a two-hundred gigaton asteroid that rivals the rock that felled the dinosaurs is hurtling toward Earth on a collision course, you don’t have time to argue. Will Glyer’s nanites be Earth’s salvation or destruction?