"Overall, for purposes of this assessment, the Agency assumed that the FY 2013 Continuing Resolution, with all of its terms and conditions, would be extended from March 27 to September 30, 2013, and that the sequester would cancel 5.0 percent of the fullyear amount, which would be the equivalent of roughly a 9 percent reduction over the remaining seven months of the fiscal year. NASA's assessment of the impacts of a March 1 sequester is presented in the enclosure."
Space Launch System, Orion wouldn't be affected by sequestration, Huntsville Times
"NASA has decided to spare its Space Launch System and Orion crew capsule from any direct consequences of budget sequestration this year, according to NASA Administrator Charles Bolden Jr. Taking the cuts instead in the "exploration" part of NASA's budget would be commercial space companies trying to build spaceships to get American astronauts to the International Space Station. The Space Launch System (SLS) is NASA's name for a new booster being developed at Marshall Space Flight Center in Huntsville for deep space missions and the Orion capsule that will ride on top of it."