Amirani, Tvashtar, and Prometheus; Stereo imaging over Tohil Mons I31 August 6, 2001 194 km 121 mi Camera problems preclude high-resolution imaging; Near-IR spectrometer observes eruption at Thor I32 October 16, 2001 184 km 114 mi High-resolution observations of Thor, Tohil Mons, Gish Bar I33 January 17, 2002 102 km 63 mi Spacecraft safing event precludes observations;