The 2009 Apparition of methuselah comet 107P/Wilson-Harrington: A case of comet rejuvenation?

► Comet 107P/WH was active in 1949, 1979, 1992, 2005, and 2009. ► Its age can be measured. We find T-AGE=4700 comet years, WB-AGE=7800 cy. ► This is a methuselah comet very near to dormancy, being temporarily rejuvenated. ► The diameter is Deffe=3.67±0.06 km, and the rotational period, Prot=6.093±0.002 h. ► There are three members in the graveyard of comets, 107P, 133P and D/1891W1.