UPSA Object Registry
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Neptune

Planet JPL Horizons
Mean radius
24,624 km
Mass
102.41 1e24 kg
Density
1.638 g/cm^3
Surface gravity
11.15 m/s^2
Rotation period
16.11
Orbital period
60,189 d
Geometric albedo
0.41
Mean temperature
72

Also known as

1 identifiers

Horizons 899

Recorded parameters

23 quantities with a single published value
ParameterValueUnitUncertainty As publishedSourceReference
Mass 102.409 1e24 kg Mass x10^24 (kg) JPL Horizons JPL Horizons on-line ephemeris system
Mean radius 24,624 km Vol. mean radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Equatorial radius 24,766 Equat. radius (1 bar) JPL Horizons JPL Horizons on-line ephemeris system
Density 1.638 g/cm^3 Density (g/cm^3) JPL Horizons JPL Horizons on-line ephemeris system
Orbital period 60,189 d Sidereal orbit period JPL Horizons JPL Horizons on-line ephemeris system
Rotation period 16.11 Sid. rot. period (III) JPL Horizons JPL Horizons on-line ephemeris system
Geometric albedo 0.41 Geometric Albedo JPL Horizons JPL Horizons on-line ephemeris system
Escape velocity 23.5 km/s Escape speed (1 bar) JPL Horizons JPL Horizons on-line ephemeris system
GM 6,835,100 km^3/s^2 GM (km^3/s^2) JPL Horizons JPL Horizons on-line ephemeris system
Mean temperature 72 Atmos. temp. (1 bar) JPL Horizons JPL Horizons on-line ephemeris system
Obliquity to orbit 28.32 deg Obliquity to orbit JPL Horizons JPL Horizons on-line ephemeris system
Mean solar day ~16.11 h h Mean solar day, h JPL Horizons JPL Horizons on-line ephemeris system
Surface gravity 11.15 m/s^2 Equ. grav, ge (m/s^2) JPL Horizons JPL Horizons on-line ephemeris system
Aroche ice rp 2.98 Aroche(ice)/Rp JPL Horizons JPL Horizons on-line ephemeris system
Dg d mean orbit velocity 5.43 km/s dg/d Mean orbit velocity JPL Horizons JPL Horizons on-line ephemeris system
Flattening 0.0171 Flattening JPL Horizons JPL Horizons on-line ephemeris system
Hill s sphere rad rp 4,700 Hill's sphere rad., Rp JPL Horizons JPL Horizons on-line ephemeris system
Pol grav gp m s 2 11.41 m/s^2 Pol. grav, gp (m/s^2) JPL Horizons JPL Horizons on-line ephemeris system
Polar radius km 24,342 km Polar radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Sid rot rate rad s 0.000108338 rad/s Sid. rot. rate (rad/s) JPL Horizons JPL Horizons on-line ephemeris system
Vis mag opposition 7.84 Vis. mag. (opposition) JPL Horizons JPL Horizons on-line ephemeris system
Visual magnitude v 1 0 -6.87 Visual magnitude V(1,0) JPL Horizons JPL Horizons on-line ephemeris system
Volume 10 10 km 3 6,254 Volume, 10^10 km^3 JPL Horizons JPL Horizons on-line ephemeris system

Provenance

where this card came from
ArchiveRead at (UTC)Record
JPL Horizons 2026-08-14 17:11 open at source

Machine-readable: /api/v1/object/neptune · Registry entry updated 2026-08-14.