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NASA engineers have decided to go ahead with a series of spacewalks to repair the ISS cooling system, thereby delaying the Cygnus cargo mission until January.
The EVAs will take place on December 21, 23 and 25 followed by a Russian Spacewalk on the 27th and a Beta-Angle Cut-out beginning on December 29. That means that the earliest launch opportunity for Cygnus is January 9, 2014 (local time) – pending the successful execution of the contingency EVAs.
Update: The Orbital Sciences press announcement says their launch can happen no earlier than January 13.