In a recent paper [1] and letter [2], Rusty Schweickart made some recommendations on dealing with the threat of a possible impact in 2036, and he called on further analysis to be done. This is my input to that analysis. Comments are welcome.
The most important thing that I propose is that deflection by the impact of a spacecraft is practical in this case. Such a mission could be done fairly quickly at a reasonable cost.
The asteroid under discussion, with the provisional designation 2004 MN4, has now been assigned the number 99942 and the name Apophis. (Apophis was the Greek name of the Egyptian god Apep, "the destroyer.") Therefore, I use this name below.
