Occultation of TYC 2397-00753-1 by (312) Pierretta on 2008-12-20 Red O-: Stefano Sposetti Optics: M400 | Method: CCD | Duration: 9.03,46.23,0 Red O-: Gerardo Sbarufatti Optics: M280 | Method: VID | Duration: 9.80,45.10,0