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University of British Columbia Professor published an on-line article that projected an 800m asteroid would hit Antarctica in the fall of 2012.
His article was on the www.phas.ubc.ca website for 2 days before it abruptly disappeared. The initial data was gathered by The Balloon-borne Large-Aperture Sub millimeter Telescope (BLAST) at McMurdo Station, Antarctica. The theorized asteroid was then tracked by Canada-France-Hawaii Telescope on Mauna Kea, which (with the Adaptive Optics Bonnette) supplies probably the sharpest images currently obtainable from the ground.
The article hypothesized a 94% probability that the asteroid would impact on the Filchner-Ronne ice shelf and cause 2/3 of ice on Antarctica to crumble into sea. The article surmised the total collapse of all Antarctic ice within 2-4 months after impact. “A deep enough impact would crack the ice shelf like a window and total structural collapse would be inevitable, a few months at the outside.” If the ice on Antarctica was added the the world’s ocean it would raise them by 70 meters.