Planet	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune
Symbol	D	♀	Å	♂	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	7^o	3.4^o	0^o	1.9^o	1.3^o	2.5^o	0.8^o	1.8^o
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/m^3)	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*	59^d CCW	243^d CW	1^d CCW	1.03^d CCW	9.92^hr CCW	10.66^hr CCW	17.24^hr CW	16.11^hr CCW
Inclination of Rotation Axis	0^o	177.4^o	23.5^o	25.2^o	3.1^o	26.7^o	97.8^o	28.3^o
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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