Planets and moons / 18 objects
Explore current and archived artwork, adopted sizes, measurement definitions and sources. Each drawing fits its own frame. Use the stated dimensions to compare actual sizes.
Showing 18 objects
Planets and moons / mercury
4,879 km
4,878.8 km-0.00%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / venus
12,104 km
12,103.6 km-0.00%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / earth
12,742 km
12,742 km
Mean diameter derived from mean radius; not equatorial diameter.
Diameter across the centre of the mean-size disc.
Earth row, Mean Radius (km), reference [D]. Diameter rounded to the nearest kilometre.
JPL Planetary Physical Parameters; reference [D], IAU 2015 report (Archinal et al., 2018)
Planets and moons / mars
6,779 km
6,779 km
Mean diameter derived from mean radius; not equatorial diameter.
Diameter across the centre of the mean-size disc.
Mars row, Mean Radius (km), reference [D]. Twice the listed radius is 6,779 km.
JPL Planetary Physical Parameters; reference [D], IAU 2015 report (Archinal et al., 2018)
Planets and moons / jupiter
139,820 km
139,822 km0.00%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / saturn
116,460 km
116,464 km0.00%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / uranus
50,724 km
50,724 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / neptune
49,244 km
49,244 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / moon
3,475 km
3,474.8 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / io
3,643 km
3,642.98 km-0.01%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / europa
3,122 km
3,121.6 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / ganymede
5,268 km
5,262.4 km-0.11%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / callisto
4,821 km
4,820.6 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / titan
5,150 km
5,149.52 km0.00%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / triton
2,707 km
2,705.2 km-0.06%
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / pluto
2,377 km
2,376.6 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / ceres
939 km
939.4 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
Planets and moons / charon
1,212 km
1,212 km
Mean diameter, calculated as twice the mean radius; excludes rings and atmosphere limb effects.
Diameter across the centre of the disc.
Named body row, Mean Radius (km). Multiply by 2; do not substitute equatorial radius.
JPL physical parameters table accessed 2026-11-13; radius reference identified in the linked row
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