"The 2009 Apparition of Methuselah Comet 107P/Wilson-Harrington: A Case   of Comet Rejuvenation?"
  (1) We find that comet 107P/WH was active in 1949, 1979, 1992, 2005, and 2009. (2) Its age can be measured. We find T-AGE=4700 comet years, WB-AGE=7800 cy. (3) This is a methuselah comet very near to its dormancy phase, being temporarily rejuvenated due to a diminution of its perihelion distance. (4) We measured the diameter as Deffe=3.67\pm0.06 km, and the rotational period, Prot=6.093\pm0.002 h. (5) We define the region of the graveyard of comets, and three comets belong to the graveyard: 107P/Wilson-Harrington, 133P/Elst-Pizarro and D/1891W1 Blanpain. 
I. Ferr\'in, Hiromi Hamanowa, Hiroko Hamanowa, J. Hern\'andez, E.   Sira, A. S\'anchez, H. Zhao, R. Miles
astro-ph.EP