Mercury

Mass: 3.285×10^23 kg (0.055 x Earth)
Equatorial Diameter: 4,879
Equatorial Circumference: 15,329 km
Moons: none
Orbit Distance: 57,909,227 km (0.39 AU)
Orbit Period: 87.97 Earth days
Surface Temperature: -173 to 427°C

Mercury is the closest planet to the Sun.
due to its proximity it is not easily seen except during twilight.
For every two orbits of the Sun, Mercury completes three rotations about its axis.
Mercury can be observed from the Earth passing across the face of the Sun,
in an event called a transit, the next will occur on the 9th May 2016.