Planet

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

Symbol

D

H

I

W

X

Mean Distance from Sun (AU)

0.387

0.723

1.000

1.524

5.203

9.537

19.191

30.069

Orbital period (yrs)

0.24

0.62

1.00

1.85

11.86

29.45

84.02

164.79

Inclination Orbital Plane

7o

3.4o

0o

1.9o

1.3o

2.5o

0.8o

1.8o

Orbital Eccentricity

0.206

0.007

0.017

0.093

0.048

0.054

0.047

0.009

Mass (Earth=1.0)

0.055

0.815

1.000

0.107

318

95.2

14.5

17.1

Equatorial radius (km)

2439

6052

6371

3390

69,911

58,232

25,362

24,624

Density (kg/m3)

5430

5200

5520

3930

1330

690

1320

1640

Oblateness

0

0

0.003

0.005

0.060

0.108

0.030

0.026

Surface gravity (Earth=1)

0.38

0.91

1.00

0.38

2.36

0.92

0.89

1.12

Escape Velocity (km/sec)

4.4

10.4

11.2

5.0

59

35

21

23

Albedo

0.11

0.65

0.37

0.15

0.52

0.47

0.51

0.41

Rotation Period*

59d

CCW

243d

CW

1d

CCW

1.03d

CCW

9.92hr

CCW

10.66hr

CCW

17.24hr

CW

16.11hr

CCW

Inclination of Rotation Axis

0o

177.4o

23.5o

25.2o

3.1o

26.7o

97.8o

28.3o

Number of Satellites

0

0

1

2

63

56

27

13

Most Abundant Atmospheric Gases

None

CO2

N2,O2

CO2

H2,He

H2,He

H2,He

H2,He

Brightest Apparent Magnitude

-1.9

-4.4

 

-2.8

-2.5

-0.4

+5.6

+7.9

http://nssdc.gsfc.nasa.gov/planetary/planetfact.html

 

http://ssd.jpl.nasa.gov/

 

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