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Mercury
Mercury Mercury symbol
Orbital characteristics
Aphelion

69,816,900 km
0.466 697 AU

Perihelion

46,001,200 km
0.307 499 AU

Semi-major axis

57,909,100 km
0.387 098 AU

Eccentricity

0.205 630

Orbital

87.969 1 d
(0.240 846 a)

Synodic period

115.88 d

Average orbital speed

47.87 km/s

Inclination

7.005° to Ecliptic
3.38° to Sun’s equator
6.34° to Invariable plane

Longitude of ascending node

Longitude of ascending node

Argument of perihelion

29.124°

Satellites

None

Physical characteristics
Flattening

< 0.0006[6]

Surface area

7.48 × 107 km² 0.108 Earths[5]

Mass

3.3022 × 1023 kg 0.055 Earths[5]

Mean density

5.427 g/cm³[5]

Equatorial surface gravity

3.7 m/s²

Escape velocity

0.38 g[5]

Sidereal rotation period

4.25 km/s[5]

Equatorial rotation velocity

58.646 day 1407.5 h[5]

Axial tilt

10.892 km/h (3.026 m/s)

North pole right ascension

2.11′ ± 0.1′[7]

North pole declination

18 h 44 min 2 s 281.01°[3]

Albedo

61.45°[3]

Apparent magnitude
Angular diameter

4.5" – 13"[3]

Atmosphere
Surface pressure

only a trace of pressure

Compositions

42% Oxygen,
29% Sodium,
22% Hydrogen,
6% Helium,
0.5% Potassium,
possible trace
amounts of Argon,
Carbon Dioxide,
Water,
Nitrogen,
Xenon, Krypton,
Neon

Mercury is the first planet from our sun. it's diameter is ±1.5x of earths moon.

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