Portal:Physics/Selected images/14
Discovery of Pluto's fifth moon:
Hubble Space Telescope discovery of Styx, Pluto's fifth moon.[a] (also informally known as P5) is a small natural satellite of Pluto whose discovery was announced on 11 July 2012. It is the fifth confirmed satellite of Pluto, and was found approximately one year after S/2011 (134340) 1 (or "P4"), Pluto's fourth discovered satellite. The moon is estimated to have a diameter of between 10 and 25 kilometers (6 and 16 mi), and orbital period of 20.2 ± 0.1 days.
- ^ 134340 is Pluto's Minor Planet Center number, assigned following its demotion from full planetary status in 2006.[1] "S/2012 P 1" is the format that would have been used without the demotion.
- ^ "Pluto is Now Just a Number: 134340". Purch. September 11, 2006. Retrieved August 19, 2014.