Hi Alfredo

> how it is possible to see in guide this new comet?
> there is not in list of visible comets!
> http://astronomynow.com/CometYi-SWANfinder.htm
> thanks!

Either you enter the orbital elements at:
http://www.cfa.harvard.edu/iau/Ephemerides/Comets/index.html
http://www.cfa.harvard.edu/iau/Ephemerides/Comets/2009F6.html
manually,

or you download the current set of orbital elements of comets via:
http://www.cfa.harvard.edu/iau/Ephemerides/Comets/SoftwareComets.html
http://www.cfa.harvard.edu/iau/Ephemerides/Comets/Soft02Cmt.txt
and use this.

Clear skies
Wolfgang

--
Wolfgang Renz, Karlsruhe, Germany