Changes

== Rotational characteristics ==

== Rotational characteristics ==

Hyperion's rotation is chaotic and nearly unpredictable.<ref name=Wisdom>J. Wisdom, S.J. Peale, F. Mignard. "[http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-47313KS-YY&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d42f224c66e0051b451986d67951aca5 The chaotic rotation of Hyperion]". (IAU, COSPAR, NASA, et al., Colloquium on Natural Satellites, 77th, Cornell University, Ithaca, NY, July 5-9, 1983) ''Icarus'' (ISSN 0019-1035) 58: 137-152. {{doi|0.1016/0019-1035(84)90032-0}} Accessed June 9, 2008.</ref> Astronomers cite a number of factors, including the 4:3 orbital resonance with Titan, to account for this.<ref name=Britannica/><ref name=Arnett>Arnett, Bill. "[http://www.nineplanets.org/hyperion.html Entry for Hyperion]." ''The <s>Nine</s> 8 Planets'', July 12, 2007. Accessed June 9, 2008.</ref><ref name=Piazza>Piazza, Eric. "[http://saturn.jpl.nasa.gov/science/moons/moonDetails.cfm?pageID=6 Cassini-Huygens: Moons: Hyperion]." November 3, 2006, Accessed June 9, 2008.</ref>

Hyperion's rotation is chaotic and nearly unpredictable.<ref name=Wisdom>J. Wisdom, S.J. Peale, F. Mignard. "[http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-47313KS-YY&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d42f224c66e0051b451986d67951aca5 The chaotic rotation of Hyperion]". (IAU, COSPAR, NASA, et al., Colloquium on Natural Satellites, 77th, Cornell University, Ithaca, NY, July 5-9, 1983) ''Icarus'' (ISSN 0019-1035) 58: 137-152. {{doi|0.1016/0019-1035(84)90032-0}} Accessed June 9, 2008.</ref> Astronomers cite a number of factors, including the 4:3 orbital resonance with Titan, to account for this.<ref name=Britannica/><ref name=Arnett>Arnett, Bill. "[http://www.nineplanets.org/hyperion.html Entry for Hyperion]." ''The <s>Nine</s> 8 Planets'', July 12, 2007. Accessed June 9, 2008.</ref><ref name=Piazza>Piazza, Eric. "[http://saturn.jpl.nasa.gov/science/moons/moonDetails.cfm?pageID=6 Cassini-Huygens: Moons: Hyperion]." November 3, 2006. Accessed June 9, 2008.</ref>

== Physical characteristics ==

== Physical characteristics ==