Image: Wikimedia Commons

Neso

Moon of Neptune

Entitymoon of Neptune irregular moonQ19574

Also known as Neptune XIII · S/2002 N 4

Instance of: moon of Neptune
, irregular moon

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Neso, also known as Neptune XIII and previously as S/2002 N 4, is the second-outermost-known moon of Neptune, behind S/2021 N 1. It was discovered on 14 August 2002 by Matthew Holman, JJ Kavelaars, Tommy Grav, Wesley Fraser, and Dan Milisavljevic at Cerro Tololo Inter-American Observatory, Chile. Named after one of the Nereids from Greek mythology, Neso orbits Neptune at an average distance of 49.9 million km (31.0 million mi)—almost as far as Mercury's orbital distance from the Sun—and takes about 26.8 Earth years to complete one orbit. It is classified as an irregular moon because it follows a distant, highly eccentric, and highly inclined orbit.

Overview

All data

18 statements · 17% with external sources · numbers in brackets are citations

Discovered by: Matthew J. Holman
Orbits: Neptune
Provisional designation: S/2002 N 4
Discovered: August 14, 2002
Named after: Neso
Semi-major axis: 48.4M km
Mass: 160 exagram
1
Sources
1.ssd.jpl.nasa.gov/?sat_phys_parRetrieved 2020-09-05
View statement on Wikidata ↗
Eccentricity: 0.5714
Inclination: 136.439 degree
Orbital period: 9,740.73 days
Diameter: 60 km
Albedo: 0.04

On other databases

2 identifiers linking Neso across the web's reference databases

Freebase ID/m/0393b5
NAIF ID813

Data quality

statements

17%

externally sourced

Source last edited October 6, 2026. AIDB refreshes this page daily.

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AIDB. (2026). Neso (Q19574). Retrieved from https://aidb.si/e/neso-Q19574