Tranquility emergency reboot on Thursday, January 19 (http://www.eveonline.com/news.asp?a=single&nid=4864&tid=1)
19 January 2012, 1:17 am
Tranquility will be taken down for a reboot on Thursday, January 19 at 01:20 UTC to resolve issues with fleets on the server. We apologize for any inconvenience and we estimate that the server will be up at 02:00 UTC.
Source: eveonline.com | news from EVE (http://www.eveonline.com/)