planet

Mercury

The smallest planet and the closest to the Sun, with almost no atmosphere.

See Mercury on the map

Across the equator

4,879 km

Average distance from the Sun

0.387 AU (about 58 million km)

One trip round the Sun

88 Earth days

One spin on its axis

58.6 Earth days. A day-night cycle (solar day) takes about 176 Earth days.

Moons

none

Equatorial diameters (the same values the map draws) and spin: NASA NSSDC planetary fact sheets (https://nssdc.gsfc.nasa.gov/planetary/factsheet/). Mean distance from the Sun: JPL Approximate Positions of the Planets, Table 1, and the JPL Small-Body Database for Ceres and Pluto. Year length is computed from the distance with Kepler's third law (years = distance in AU to the power 1.5).

Other worlds: Venus · Mars · Jupiter · Saturn · Uranus · Neptune · Ceres · Pluto

As an Amazon Associate we earn from qualifying purchases.