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Encyclopedia > Characteristics > Mercure II
CHARACTERISTICS OF MERCURY
| Characteristics | Values |
|---|---|
| Semi-major axis in astronomical units (AU) | 0.3870983 |
| Semi-major axis in km | 57 909 083 |
| Eccentricity of the orbit | 0.20563 |
| Inclination of the orbit to the ecliptic | 7°.0050 |
| Inclination of the equator on the ecliptic | 0°.01 |
| Sidereal period of revolution | 87.9693 days |
| Rotation periode | 58.65 days |
| Orbital velocity | 48 km/s |
| Apparent equatorial diameter at the smallest distance from the Earth (maximum value) |
13".0 |
| Equatorial diameter (Earth=1) | 0,3825 |
| Equatorial diameter | 4879.4 km |
| Visual magnitude at one AU (zero phase) | -0.42 |
| Flattening | 0 |
| Volume (Earth=1) | 0.056 |
| Mass (Sun=1) | 1/6 023 600 |
| Mass (Earth=1) | 0.055 |
| Density(Earth=1) | 0.984 |
| Density (Water=1) | 5.43 |
| Surface gravity(Earth=1) | 0.38 |
| Escape velocity | 4250 m/s |
| Reflectivity (geometric albedo) | 0.11 |
| Highest peak | 4600 m |
| Deepest pit | 2500 m |
| Surface temperature | -173°/+427°C |
| Atmosphere | tenuously :
traces of hydrogen, helium, neon, argon, and sodium |
