One year later, on 12 November 1980, "Voyager 1" flew 415,670 km from Tethys. Its twin spacecraft, "Voyager 2", passed as close as 93,010 km from the moon on 26 August 1981. Although both spacecraft took images of Tethys, the resolution of "Voyager 1"'s images did not exceed 15 km, and only those obtained by "Voyager 2" had a resolution as high as 2 km. The first geological feature discovered in 1980 by "Voyager 1" was Ithaca Chasma. Later in 1981 "Voyager 2" revealed that it almost circled the moon running for 270°. "Voyager 2" also discovered the Odysseus crater. Tethys was the most fully imaged Saturnian satellite by the "Voyagers".