Discovered by            H. Reitsema, W. Hubbard, L.
                         Lebofsky, D. Tholen
Date of Discovery        1982
Distance from Neptune    73,550 km
Radius                   104 × 89 km
Mass                     ???
Orbital Eccentricity     0.00139
Orbital Inclination      0.20°
Orbital Period           0.554654 day
Rotational Period        ???
Density (gm/cm3)         ???

Larissa was discovered from imagery from the Voyager 2 probe, and the pictures are quite fuzzy. There is no sign of geological activity or anything else interesting besides impact craters. It orbits in the same direction as Neptune's rotation.

Sources:
NASA.gov
space.com

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