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Neptune’s Moon Larissa

Planet Larissa — Larissa is the fifth of Neptune’s known moons. It was discovered by Harold Reitsema based on ground-based stellar occultation observations, and was photographed by Voyager 2 in 1989.

Larissa is irregular (non-spherical) in shape and appears to be heavily cratered, with no sign of any geological modification. Little else is known about it.

Since its orbit is below Neptune’s synchronous orbit radius it is slowly decaying due to tidal forces and will one day break up into a planetary ring or impact on Neptune’s surface.

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Discovery

Discovered by Harold Reitsema and Voyager 2
Discovered in 1989

Orbital characteristics

Orbital radius: 73,600 km
Orbital period: 0.554654 days
Orbital inclination: 0.20

Physical characteristics

Diameter: 193 km (208 x 178)
Mass: Unknown

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NASA

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Neptune8217s Moon Larissa


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