UPSA Object Registry
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Mercury

Planet JPL Horizons
Mean radius
2,439.4 km
Mass
3.302 1e23 kg
Density
5.427 g cm^-3
Surface gravity
3.701 m/s^2
Rotation period
58.646 d
Orbital period
0.24085 y
Geometric albedo
0.106
Mean temperature
440 K

Also known as

1 identifiers

Horizons 199

Recorded parameters

23 quantities with a single published value
ParameterValueUnitUncertainty As publishedSourceReference
Mass 3.302 1e23 kg Mass x10^23 (kg) JPL Horizons JPL Horizons on-line ephemeris system
Mean radius 2,439.4 km Vol. Mean Radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Equatorial radius 2,440.53 re Equatorial radius, Re JPL Horizons JPL Horizons on-line ephemeris system
Density 5.427 g cm^-3 Density (g cm^-3) JPL Horizons JPL Horizons on-line ephemeris system
Orbital period 0.2408467 y Sidereal orb. per. JPL Horizons JPL Horizons on-line ephemeris system
Rotation period 58.6463 d Sidereal rot. period JPL Horizons JPL Horizons on-line ephemeris system
Geometric albedo 0.106 Geometric Albedo JPL Horizons JPL Horizons on-line ephemeris system
Escape velocity 4.435 km/s Escape vel. km/s JPL Horizons JPL Horizons on-line ephemeris system
GM 22,031.87 km^3/s^2 GM (km^3/s^2) JPL Horizons JPL Horizons on-line ephemeris system
Mean temperature 440 K Mean Temperature (K) JPL Horizons JPL Horizons on-line ephemeris system
Mean orbital speed 47.362 km/s Mean Orbit vel. km/s JPL Horizons JPL Horizons on-line ephemeris system
Mean solar day 175.9421 day Mean solar day JPL Horizons JPL Horizons on-line ephemeris system
Surface gravity 3.701 m/s^2 Equ. gravity m/s^2 JPL Horizons JPL Horizons on-line ephemeris system
Atmospheric pressure < 5x10^-15 bar Atmos. pressure (bar) JPL Horizons JPL Horizons on-line ephemeris system
Core radius km ~1600 km Core radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Hill s sphere rad rp 94.4 Hill's sphere rad. Rp JPL Horizons JPL Horizons on-line ephemeris system
Mass ratio sun plnt 6,023,682 sun/plnt Mass ratio (Sun/plnt) JPL Horizons JPL Horizons on-line ephemeris system
Max angular diam 11 " Max. angular diam. JPL Horizons JPL Horizons on-line ephemeris system
Mom of inertia 0.33 Mom. of Inertia JPL Horizons JPL Horizons on-line ephemeris system
Sid rot rate rad s 1.24001e-06 rad/s Sid. rot. rate (rad/s) JPL Horizons JPL Horizons on-line ephemeris system
Surface emissivity 0.77 Surface emissivity JPL Horizons JPL Horizons on-line ephemeris system
Visual mag v 1 0 -0.42 Visual mag. V(1,0) JPL Horizons JPL Horizons on-line ephemeris system
Volume x10 10 km 3 6.085 x10^10 km^3 Volume (x10^10 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 17:08 open at source

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