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Solar
Planet

Mercury

Where is it now

Distance from Sun
0.361 AU
True anomaly
82.73°
As of
29 August 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Orbital elements

Semi-major axis
0.387 AU
Eccentricity
0.2056
Inclination
Orbital period
88 days
Perihelion
0.307 AU
Aphelion
0.467 AU
Longitude of ascending node
48.33°
Argument of periapsis
29.12°
Epoch · J2000
J2000

Physical properties

Mean radius
2,440 km
Mass
3.301 × 10²³ kg
Density
5.427 g/cm³
Rotation period
58.65 days
Axial tilt
0.03°
Surface gravity
3.7 m/s²
Escape velocity
4.25 km/s

Visual & observation

Geometric albedo
0.142
Bond albedo
0.088
Representative colour
#8C7853

Sources