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Mercury

Mercury
Orbital Characteristics of Mercury

Orbital Characteristics

Perihelion: 46,001,200 km, 0.307499 AE
Aphelion: 69,816,900 km, 0.466697 AE
Semi-major axis: 57,909,100 km, 0.387098 AE
Eccentricity: 0.205630
Orbital period: 87.9691 days, 0.240846 years
Synodic period: 115.88 days
Average orbital speed: 47.87 km/s
Mean anomaly: 174.796°
Inclination: 7.005°
Longitude of ascending node: 48.331°
Argument of perihelion: 29.124°

Satellites/moons: 0

Physical Characteristics of Mercury

Physical Characteristics

Equatorial radius: 2,439.7 km (0.3829 x Earth)
Flattening: < 0.0006
Surface area: 7.48×1070.108 km2 ( x Earth)
Volume: 6.083×1010 km3 (0.054 x Earth)
Mass: 3.3022×1023 kg (0.055 x Earth)
Mean density: 5.427 g/cm3
Equatorial surface gravity: 3.7 m/s2
Escape velocity: 4.25 km/s
Sidereal rotation period: 58.646 Earth days, 1407.5 Earth hours
Axial tilt : 2.11′ ± 0.1′
Albedo: 0.106
Average surface temperatures: 100/700 K, -173/427 °C, -279/801 °F
Apparent magnitude: −1.9
Angular diameter: 4.5" – 13"
The Atmosphere of Mercury

The Atmosphere

Composition:
  • 42% Oxygen (O2)
  • 29.0% Sodium
  • 22.0% Hydrogen (H2)
  • 6.0% Helium
  • 0.5% Potassium
  • Trace amounts of Argon, Nitrogen (N2), Carbon Dioxide (CO2), water vapor (H2O), Xenon, Krypton, Neon

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