We don't know whether it was or was not(unlikely) "the last planet vistited by Enterprise", as even though it was, in the series, this is an in-universe article. – The preceding unsigned comment was added by 220.127.116.11 (talk).
When interrogating Klaang, Silik spoke Klingonese and seemed to pronounce the name "Rigel" as raySul (in Marc Okrand's Klingon transliteration system.) If this was also how Klingons pronounce the name, and if the name was in fact a Klingon one, then the Enterprise crew's pronunciation of "Rigel" was an anglicization of raySul (similar to "Canton" being an anglicization of the name of the city of Guangzhou, China as well as the actual name of a city in Ohio.) This provides more support to the contention that the Rigel in ENT (and perhaps in the whole franchise) is most likely not the actual star Rigel. -- Astrophysicophile 16:21, 28 November 2011 (UTC)