New Horizons 2 (also New Horizons II, NHII, or NH2) was a proposed mission to the trans-Neptunian objects by NASA. It was conceived as a planetary flyby mission in 2002, based on the New Horizons spacecraft, which was in development at the time.[1][2] In March 2005, the proposal was not selected for further development because of a shortage of plutonium-238 needed for the radioisotope thermoelectric generator (RTG).[3] The New Horizons 2 study was funded by the New Frontiers program, and delivered to the U.S. Congress in June 2005.[4]
- ^ "New Horizons II (2004-2005) | Wired Science | Wired.com". 2012-05-26. Archived from the original on 2012-05-26. Retrieved 2018-10-30.
- ^ Stern, Alan; Binzel, Rick; et al. "New Horizons 2" (PDF). Lunar and Planetary Institute. Retrieved 2 August 2013.
- ^ "New Horizons II Final Report - March 2005" (PDF).
- ^ "Presentation: SSE Decadal Survey and New Horizons: A Rough Start" (PDF). June 2005.