Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0607e&link_type=abstract
American Astronomical Society, DDA meeting #41, #6.07; Bulletin of the American Astronomical Society, Vol. 41, p.932
Other
Scientific paper
Missions to near earth asteroids (NEOs) are a key part of NASA's new "Flexible Path" approach. In addition to the intrinsic scientific interest, and the hazards and resources that NEOs present, NASA's need for destinations the motivation to study NEOs closely has reached a critical level.
I examine the selection of optimal targest among the known NEOs to define a set of "Potentially Visitable Objects" (PVOs). Delta-v is the primary criterion; only 6 of the 6699 known NEOs have delta-v <4km/s, 2/3 of the lunar rendezvous from LEO delta-v, greatly limiting NASA's choice. Potentially there are at least an order of magnitude more PVOs, but a dedicated survey - preferably in the mid-IR from a Venus-like orbit - is needed to find them all on a short enough timescale.
Several other criteria: low spin rate, convenient launch window, lack of satellites, and benign (low volatile) composition, will limit the choice further. Ground based observations - high accuracy astrometry and photometry, plus optical-infrared spectra - will be needed to refine the PVO list.
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