Science Mission Directorate (SMD) is releasing a NASA Announcement of Opportunity (NNH09ZDA007O), New Frontiers 2009. NASA expects to select up to three New Frontiers mission proposals for a 10 month Phase A study. Following evaluation of Phase A reports, NASA expects to approve one New Frontiers mission to proceed into Phase B and subsequent mission phases. Launch is to occur no earlier than late CY 2016 and no later than CY 2018. The proposed missions must address the science objectives of one of the eight mission concepts identified in the National Research Council's 2007 report, Opening New Frontiers in Space: Choices for the Next New Frontiers Announcement of Opportunity.