Mars

Mars

原名: Mars | 别名:
出生: (岁)
出生地:
 : −110 °C, −60 °C, 35 °C
Mass: 6.4171×1023 kg, (0.107 Earths)
Albedo: 0.170 geometric, , 0.25 Bond
Volume: 1.63118×1011 km3, (0.151 Earths)
Aphelion: 249261000 km, (1.66621 AU)
Adjectives: Martian, , Arean (rare, from Ares), , see Name of Mars
Axial tilt: 25.19° to its orbital plane
Flattening: 0.00589±0.00015
Perihelion: 206650000 km, (1.3814 AU)
Satellites: 2 (Phobos and Deimos)
Inclination: 1.850° to ecliptic, , 5.65° to Sun's equator, , 1.63° to invariable plane
Mean radius: 3389.5±0.2 km[b]
Temperature: 209 K (−64 °C) (blackbody temperature)
Eccentricity: 0.0934
Mean anomaly: 19.412°
Mean density: 3.9335 g/cm3
Polar radius: 3376.2±0.1 km[b], (0.531 Earths)
Surface area: 1.4437×108 km2, (0.284 Earths)
Surface temp.: Surface temp. min mean max   −110 °C −60 °C 35 °C, −110 °C, −60 °C, 35 °C
Escape velocity: 5.027 km/s, (18100 km/h)
Semi-major axis: 227939366 km, (1.52368055 AU)
Surface gravity: 3.72076 m/s2 (0.3794 g0)
Angular diameter: 3.5–25.1 arcseconds
Surface pressure: 0.636 (0.4–0.87) kPa, 0.00628 atm
Equatorial radius: 3396.2±0.1 km[b], (0.533 Earths)
Apparent magnitude: −2.94 to +1.86
Time of perihelion: 11 February 2028
Average orbital speed: 24.07 km/s
Composition by volume: 95.97% carbon dioxide, , 1.93% argon, , 1.89% nitrogen, , 0.146% oxygen, , 0.0557% carbon monoxide, , 0.0210% water vapor
Absolute magnitude (H): −1.5
Argument of perihelion: 286.5°
North pole declination: 54.432°
Synodic rotation period: 1.02749125 d, 24h 39m 36s
Moment of inertia factor: 0.3644±0.0005
Orbital period (synodic): 779.94 d, (2.1354 yr)
Sidereal rotation period: 1.025957 d, 24h 37m 22.7s
Orbital period (sidereal): 686.980 d, (1.88085 yr; 668.5991 sols)
Surface absorbed dose rate: 8.8 μGy/h
North pole right ascension: 317.269°
Surface equivalent dose rate: 27 μSv/h
Equatorial rotation velocity: 241 m/s, (870 km/h)
Longitude of ascending node: 49.57854°

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