Mass: 330,104,000,000,000 billion kg (0.055 x Earth)
Equatorial Diameter: 4,879
Radius: 2,440 km
Equatorial Circumference: 15,329
Distance from Sun: 57,910,000km
Surface Temperature: -173 to 427°C
Gravity: 3.7 m/s²
Length of day: 58d 15h 30m
Orbital period: 88 days
Density: 5.43 g/cm³
Known Moons: none
Notable Moons: none
First Record: 14th century BC
Recorded By: Assyrian astronomers
Missions: American Mariner 10 (1974), NASA Messenger (2008)
Source: http://space-facts.com/mercury/