| Origin of name |
Pluto is named after the Greek god of the underworld.
Once considered to be the ninth planet in the Solar System, Pluto was reclassified as a dwarf planet in 2006.
|Property||Unit||Value||Earth = 1|
|Surface gravity at equator||ms-2||0.58||0.059|
|Number of natural satellites||3|
|Mean distance from the Sun (x106)||km||5900.1|
|Mean distance from the Sun||AU||39.44|
|Sidereal orbit period||y||247.68|
|Sidereal rotation period||h||R 153.293|
|Length of day||h||153.282|
|Orbit inclination to Ecliptic||°||17.16|
|Mean orbital velocity||kms-1||4.72|
|Maximum orbital velocity||kms-1||6.10|
|Minimum orbital velocity||kms-1||3.71|
- Sidereal orbit period
The time taken by the planet to complete exactly one orbit around the Sun with respect to the celestial sphere.
- Sidereal rotation period
The time in which the planet rotates around its axis exactly 360° with respect to the celestial sphere.
- Length of a day
Defined as the time between two successive sunrises over the meridian.
- Magnetic dipole moment
Calculated as the ratio of the magnetic field strength at the equator divided by the cube of the equatorial radius.