Closest approach to earth:
34,600,000 miles

Mean distance from the sun:
141,600,000 miles

Period of rotation around the sun:
1.88089 years

Sideral rotation period:
24 hours, 37 minutes, 22.66 seconds

Mean surface atmospheric temperature:
-23 degrees

Visual albedo:
0.159

Pole Star:
BD 52, Degrees 2880

Visual magnitude at mean opposition:
-2.01

Mass:
0.10174
Density:
3.93

Diameter:
0.532