A magnitude 17.4, comet was discovered by A. Boattini (Mt. Lemmon Survey) on November 20th, 2007.
The preliminary orbital elements of the comet indicate a perihelion passage on June 14th, 2008 at a distance of 0.7 AU from the Sun.
The comet could reach magnitude 5.5 at perihelion.

http://img353.imageshack.us/img353/6618/2007w120085319h20mvv6.th.gif (http://img353.imageshack.us/my.php?image=2007w120085319h20mvv6.gif)

Ephemeris:
Date TT R. A. (2000) Dec. Delta r Elong. Phase mag

2008 05 04 10 41.25 -21 58.7 0.388 1.259 122.3 42.6 8.4
2008 05 09 10 21.35 -22 43.0 0.356 1.198 113.8 50.4 8.0
2008 05 14 09 59.42 -23 29.6 0.326 1.140 105.1 58.9 7.6
2008 05 19 09 34.58 -24 17.2 0.297 1.084 95.9 68.2 7.2
2008 05 24 09 05.52 -25 00.1 0.271 1.031 86.3 78.5 6.8
2008 05 29 08 30.54 -25 25.5 0.247 0.983 76.0 89.9 6.4
2008 06 03 07 48.14 -25 08.6 0.228 0.941 65.0 102.3 6.0
2008 06 08 06 58.46 -23 34.1 0.214 0.906 53.9 115.1 5.7
2008 06 13 06 05.03 -20 13.3 0.210 0.878 44.4 125.9 5.5

“Comet C/2007 W1 (Boattini) continues to brighten faster than predicted, and has now reached about 6th magnitude. That's bright enough that you can see it without optical aid under excellent conditions, and it should be a relatively easy target through binoculars.”

Read more (http://www.astronomy.com/asy/default.aspx?c=a&id=6952)