Photometry of the Oort Cloud comet C/2009 P1 (Garradd): Pre-perihelion observations at 5.7 and 2.5 AU

por Mazzotta Epifani, E., Snodgrass, C., Perna, D., Dall'Ora, M., Palumbo, P., Della Corte, V., Alvarez-Candal, A., Melita, M., Rotundi, A.