Dear Christina,
Hey there. Good questions on data for the new planets. The best place to find Ceres is either one of the online tools I'm going to post in 45 seconds, or the Aureas Ephemeris. This is a French ephemeris that lists Ceres and the Black Moon Lilith (the oscillating lunar apogee). You can purchase it at
http://aureas.com -- well worth it, and note their different styles. For a multi-year ephemeris, this is the best.
As for online tools for all asteroids and 2003 UB313 "Xena." For the current position, or any one date, you can use this tool:
http://artofwebdesign.net/astrology/ephemeris.phpTo change the dates, just set the date in the form on top.
This is also cool:
http://ephemeral.info/eph2.0To click one already programmed with Ceres and 313, click here:
http://tinyurl.com/kefh9"Long" is longitude -- that is, the degree.
Play around with the settings...you can make a custom ephemeris for any planet, any date range, etc. For a pretty good list of planets, use the one on artofwebdesign.net -- that comes pre-programmed with "planet suggestions" of many varieties. I mean, they didn't have this shit when I was a kid!
Have fun!
Eric