1, Mercury
--------------
Mass (kg)								3.3 x 10^23
Diameter (km)							4878
Mean density (kg/m^3)						5420
Escape velocity (m/sec)						4300
Average distance from Sun (AU)				0.387
Rotation period (length of day in Earth days)		58.65
Revolution period (length of year in Earth days)	87.97
Obliquity (tilt of axis in degrees)				0
Orbit inclination (degrees)					7
Orbit eccentricity (deviation from circular)		0.206
Mean surface temperature (K)					452
Maximum surface temperature (K)				700
Minimum surface temperature (K)				100
Visual geometric albedo (reflectivity)			0.12
Largest known surface feature				Caloris Basin (1350 km diameter)
Atmospheric components				trace amounts of hydrogen and helium


2, Venus
-----------
Mass (kg)								4.87 x 10^24
Diameter (km)							12104
Mean density (kg/m^3)						5250
Escape velocity (m/sec)						10400
Average distance from Sun (AU)				0.723
Rotation period (length of day in Earth days)		243.0 (retrograde)
Revolution period (length of year in Earth days)	224.7
Obliquity (tilt of axis degrees)				178
Orbit inclination (degrees)					3.39
Orbit eccentricity (deviation from circular)		0.007
Mean surface temperature (K)					726
Visual geometric albedo (reflectivity)			0.59
Highest point on surface					Maxwell Montes
							(17 km above mean planetary radius)
Atmospheric components				96% carbon dioxide, 3% nitrogen,
							0.1% water vapor
Surface materials					basaltic rock and altered materials


3,Earth
---------
Mass (kg)								5.98 x 10^24
Diameter (km)							12756
Mean density (kg/m^3)						5520
Escape velocity (m/sec)						11200
Average distance from Sun (AU)				1
Rotation period (length of day in Earth hours)		23.93
Revolution period (length of year in Earth days)	365.26
Obliquity (tilt of axis in degrees)				23.4
Orbit inclination (degrees)					0
Orbit eccentricity (deviation from circular)		0.017
Mean surface temperature (K)					281
Maximum surface temperature (K)				310
Minimum surface temperature (K)				260
Visual geometric albedo (reflectivity)			0.39
Highest point on surface			Mount Everest (over 8 km above sea-
level)
Atmospheric components				78% nitrogen, 21% oxygen, 1% argon
Surface materials					basaltic and granitic rock and altered 
materials


4, Mars
----------
Mass (kg)								6.42 x 10^23
Diameter (km)							6787
Mean density (kg/m^3)						3940
Escape velocity (m/sec)						5000
Average distance from Sun (AU)				1.524
Rotation period (length of day in Earth days)		1.026
Revolution period (length of year in Earth days)	686.98
Obliquity (tilt of axis in degrees)				25
Orbit inclination (degrees)					1.85
Orbit eccentricity (deviation from circular)		0.093
Maximum surface temperature (K)				310
Minimum surface temperature (K)				150
Visual geometric albedo (reflectivity)			0.15
Highest point on surface					Olympus Mount
						(about 24 km above surrounding lava plains)
Atmospheric components			95% carbon dioxide, 3% nitrogen, 1.6% argon
Surface materials				basaltic rock and altered materials


5, Jupiter
-----------
Mass (kg)								1.90 x 10^27
Diameter (km)							142,800
Mean density (kg/m^3)						1314
Escape velocity (m/sec)						59500
Average distance from Sun (AU)				5.203
Rotation period (length of day in Earth hours)		9.8
Revolution period (length of year in Earth years)	11.86
Obliquity (tilt of axis in degrees)				3.08
Orbit inclination (degrees)					1.3
Orbit eccentricity (deviation from circular)		0.048
Mean surface temperature (K)					120 (cloud tops)
Visual geometric albedo (reflectivity)			0.44
Atmospheric components			90% hydrogen, 10% helium, 0.07% methane
Rings				Faint ring, Infrared spectra imply dark rock fragments.


6, Saturn
------------
Mass (kg)								5.69 x 10^26
Diameter (km)							120660
Mean density (kg/m^3)						690
Escape velocity (m/sec)						35600
Average distance from Sun (AU)				9.539
Rotation period (length of day in Earth hours)		10.2
Revolution period (length of year in Earth years)	29.46
Obliquity (tilt of axis in degrees)				26.7
Orbit inclination (degrees)					2.49
Orbit eccentricity (deviation from circular)		0.056
Mean temperature (K)						88 K (1 bar level)
Visual geometric albedo (reflectivity)			0.46
Atmospheric components			97% hydrogen, 3% helium,0.05% methane
Rings				Rings are 270,000 km in diameter, but only a few 
				hundred meters thick. Particles are centimeters to 
				decameters in size and are ice (some may be 
				covered with ice); there are traces of silicate and 
				carbon minerals. There are four main ring groups 
				and three more faint, narrow ring groups 
				separated by gaps called divisions.

7, Uranus
------------
Mass (kg)								8.68 x 10^25
Diameter (km)							51118
Mean density (kg/m^3)						1290
Escape velocity (m/sec)						21300
Average distance from Sun (AU)				19.18
Rotation period (length of day in Earth hours)		17.9
Revolution period (length of year in Earth years)	84
Obliquity (tilt of axis in degrees)				97.9
Orbit inclination (degrees)					0.77
Orbit eccentricity (deviation from circular)		0.047
Mean temperature (K)						59
Visual geometric albedo (reflectivity)			0.56
Atmospheric components			83% hydrogen, 15% helium, 2% methane
Rings					Uranus has a system of narrow, faint rings. Ring
					particles are dark, and could consist of rocky or 
					carbonaceous material.



8, Neptune
--------------
Mass (kg)								1.02 x 10^26
Diameter (km)							49528
Mean density (kg/m^3)						1640
Escape velocity (m/sec)						23300
Average distance from Sun (AU)				30.06
Rotation period (length of day in Earth hours)		19.1
Revolution period (length of year in Earth years)	164.8
Obliquity (tilt of axis in degrees)				29.6
Orbit inclination (degrees)					1.77
Orbit eccentricity (deviation from circular)		0.009
Mean temperature (K)						48
Visual geometric albedo (reflectivity)			0.51
Atmospheric components				74% hydrogen, 25% helium, 1% methane
Rings					Rings are narrow, and contain concentrations of
					particles called ring arcs.



9, Pluto
----------
Mass (kg)								1.29 x 10^22
Diameter (km)							2300
Mean density (kg/m^3)						2030
Escape velocity (m/sec)						1100
Average distance from Sun (AU)				39.53
Rotation period (length of day in Earth days)		6.39
Revolution period (length of year in Earth years)	247.7
Obliquity (tilt of axis in degrees)				122.5
Orbit inclination (degrees)					17.15
Orbit eccentricity (deviation from circular)		0.248
Mean temperature (K)						37
Visual geometric albedo (reflectivity)			about 0.5
Atmospheric components				Perhaps methane and nitrogen 
Surface materials					perhaps methane ice

