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Moon

Enceladus

Type
Moon
Diameter
504 km

NASA/JPL · NASA media (public domain)

Overview

Scientific overview

Enceladus is a moon orbiting Saturn.

Physical characteristics

Mass
0 ×10²⁴ kg
Diameter
504 km
Radius
252.1 km
Density
1.608 g/cm³
Surface gravity
0.12 m/s² · derived
Escape velocity
0.2 km/s · derived
Albedo
1.375
Magnitude
11.8

Derived values

Computed from source-backed inputs via standard formulae — not observations. Every input and constant is traced below.

  • Escape velocity0.2 km/sderived
    Formula & inputs

    Formula: v = √(2GM / r) (v1.0.0, impl v1.0.0)

    Inputs:

    • mass1e24Kg = 0.00011 ×10²⁴ kg · NASA
    • radiusKm = 252.1 km · NASA

    Assumptions: G = 6.674e-11 m³ kg⁻¹ s⁻² (CODATA 2018)

    Limitations: Assumes a spherical, non-rotating body.; Inputs carry no catalogued uncertainty, so none is propagated.

    Uncertainty: not propagated (inputs carry no catalogued uncertainty)

    Computed as of 2026-06-29.

  • Surface gravity0.12 m/s²derived
    Formula & inputs

    Formula: g = GM / r² (v1.0.0, impl v1.0.0)

    Inputs:

    • mass1e24Kg = 0.00011 ×10²⁴ kg · NASA
    • radiusKm = 252.1 km · NASA

    Assumptions: G = 6.674e-11 m³ kg⁻¹ s⁻² (CODATA 2018)

    Limitations: Assumes a spherical, non-rotating body.; Inputs carry no catalogued uncertainty, so none is propagated.

    Uncertainty: not propagated (inputs carry no catalogued uncertainty)

    Computed as of 2026-06-29.

Scale

Compared to Earth

Earth
Enceladus

Enceladus is 25× smaller than Earth

504 km across · Earth is 12,742 km

Gallery

Dark Side of the Moon: Enceladus

Enceladus looks as though it is half lit by sunlight in this view from NASA's Cassini spacecraft, but looks can be deceiving.

2015

NASA/JPL-Caltech/Space Science Institute · NASA media (public domain)

Source archive ↗

Observation

How this was captured

Source
NASA
Observation date
1998-12-05

Sources

The primary and reference sources this topic draws on.

  • NASANational Aeronautics and Space Administration

    Mission data, planetary science, space telescopes, and public-domain imagery.

    Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

  • NASA JPLJet Propulsion Laboratory / Solar System Dynamics

    Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.