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AsteriaStar

Moon

Callisto

Type
Moon
Diameter
4,821 km

NASA/JPL/DLR · NASA media (public domain)

Overview

Scientific overview

Callisto is a moon orbiting Jupiter.

Physical characteristics

Mass
0.108 ×10²⁴ kg
Diameter
4,821 km
Radius
2,410.3 km
Density
1.834 g/cm³
Surface gravity
1.24 m/s² · derived
Escape velocity
2.4 km/s · derived
Albedo
0.17
Magnitude
5.65

Derived values

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

  • Escape velocity2.4 km/sderived
    Formula & inputs

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

    Inputs:

    • mass1e24Kg = 0.10757 ×10²⁴ kg · NASA
    • radiusKm = 2410.3 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 gravity1.24 m/s²derived
    Formula & inputs

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

    Inputs:

    • mass1e24Kg = 0.10757 ×10²⁴ kg · NASA
    • radiusKm = 2410.3 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
Callisto

Callisto is 2.6× smaller than Earth

4,821 km across · Earth is 12,742 km

Gallery

Titan and Callisto

These images compare surface features observed by NASA Cassini spacecraft at the Xanadu region on Saturn moon Titan left, and features observed by NASA Galileo spacecraft on Jupiter cratered moon Callisto right.

2011

NASA/JPL-Caltech/ASI · NASA media (public domain)

Source archive ↗

Observation

How this was captured

Source
NASA
Observation date
2001-08-22

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.