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Planets

Characteristics of Mars

Mars is one of the four terrestrial planets. It is the fourth planet from the Sun. Despite its small size, its distance from the Sun enables it to hold onto hydrogen, which enables it to have water. In the table that follows, the observed values are taken from Yoder (1995).[ 1] Go to table of characteristics.

Characteristics of Mars

GM

4.2828(3±1)×1019 cm3 s−2

Mass

6.417×1026 g

Mean Radius

3.3899(2±4)×108 cm

Equatorial Radius

3.39(7±4)×108 cm

Flattening

1/154.409

Surface Gravity

372.698 cm s−2

Escape Velocity

5.02675×105 cm s−1

Average Density

3.933 g cm−3

Sidereal Rotation Period

24h 37m 22.6632s

88642.6632 s

Obliquity to Orbit

25° 11

Sidereal Orbital Period

686.92971 d

Semimajor Axis

1.52366231 AU

Eccentricity

0.09341233

Solar Constant

5.890 × 105 ergs cm−2 s−1

[1] Yoder, Charles F. “Astrometric and Geodetic Properties of Earth and the Solar System.” In Global Earth Physics: A Handbook of Physical Constants edited by T.J. Ahrens, 1–31. AGU Reference Shelf, No. 1. Washington: American Geophysical Union, 1995.

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