Current magnitude of Pluto=
14.25
http://theskylive.com/pluto-tracker
Limiting magnitude of a 10" scope -
14.5 or 15.7
http://www.twcac.org/Tutorials/limit...tude_table.htm
or
15.1
http://articles.adsabs.harvard.edu/c...EW&classic=YES
or
15
http://en.wikipedia.org/wiki/Limiting_magnitude
If you are somewhere very dark, it is worth having a go if you have a decent finder chart. Just don't be too optimistic.
Regards,
Renato