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Space missions to NEOs are being planned at all major space agencies, andrecently a manned mission to an NEO was announced as a NASA goal. Efforts tofind and select suitable targets (plus backup targets) are severely hampered byour lack of knowledge of the physical properties of dynamically favorable NEOs.In particular, current mission scenarios tend to favor primitive low-albedoobjects. For the vast majority of NEOs the albedo is unknown.  Here we report new constraints on the size and albedo of 65 NEOs withrendezvous deltaV < 7 km/s. Our results are based on thermal-IR flux dataobtained in the framework of our ongoing (2009--2011) ExploreNEOs survey(Trilling et al. 2010) using NASA's "Warm Spitzer" space telescope. As of 2010July 14, we have results for 293 objects in hand (including the 65 low-deltaVNEOs presented here); before the end of 2011 we expect to have measured thesize and albedo of ~ 700 NEOs (including probably ~ 160 low-deltaV NEOs).  While there are reasons to believe that primitive volatile-rich materials areuniversally low in albedo, the converse need not be true: the orbital evolutionof some dark objects likely has caused them to lose their volatiles by comingtoo close to the Sun. For all our targets, we give the closest periheliondistance they are likely to have reached (using orbital integrations fromMarchi et al. 2009) and corresponding upper limits on the past surfacetemperature. Low-deltaV objects for which both albedo and thermal history maysuggest a primitive composition include (162998) 2001 SK162, (68372) 2001 PM9,and (100085) 1992 UY4.

ExploreNEOs III: Physical characterization of 65 low-deltaV NEOs