Rotational period (days) 0.99727

Rotational period (hours) 23.9345

Orbital period (days) 365.256

Mean orbital velocity (km/sec) 29.79

Mean surface temperature 15°C

Atmospheric composition NitrogenOxygenOther

77%21%

2%

Most brilliant planet; topography consists of vast plains covered by lava flows and mountain or highland regions deformed by geological activity.

Rotational period (days) -243.0187

Orbital period (days) 224.701

Mean orbital velocity (km/sec) 35.02

Mean surface temperature 482°C

Atmospheric composition :Carbon dioxideNitrogen Trace amounts of: Sulfur dioxide, water vapor,carbon monoxide, argon, helium, neon,hydrogen chloride, and hydrogen fluoride.

96% 3+

Produced by:   Calvin J. Hamilton

Produced by:   Calvin J. Hamilton

It has eight moons

Discovered by Johann Gotfried Galle

Date of discovery September 23, 1846

Rotational period (hours) 16.11

Orbital period (years) 164.79

Mean orbital velocity (km/sec) 5.45

Mean cloud temperature -193 to -153°C

Atmospheric composition HydrogenHeliumMethane

85%13%

2%

Has, at least, 30 named satellites.

Rotational period (hours) 10.233

Orbital period (years) 29.458

Mean orbital velocity (km/sec) 9.67

Mean cloud temperature -125°C

Atmospheric composition HydrogenHelium

97%3%

Rotates one and a half times during each orbit; It is pocked with craters,

contains hugh multi-ring basins, and many lava flows

Rotational period (days) 58.6462

Orbital period (days) 87.969

Mean orbital velocity (km/sec) 47.88

Mean surface temperature 179°C

Maximum surface temperature 427°C

Minimum surface temperature -173°C

Atmospheric composition:HeliumSodiumOxygen Other

42%42%15%

1%

Produced by:   Calvin J. Hamilton

Have one satellite “Charon”; it is closer to the sun than other planet for 20 years out of its 249 year orbit; is colder than 70 Kelvin.

Discovered byClyde W.

Tombaugh

Date of discovery February 18, 1930

Rotational period (days) -6.3872

Orbital period (years) 248.54

Mean orbital velocity (km/sec)

4.74

Atmospheric composition MethaneNitrogentraces of carbon monoxide

98%0.3%

Produced by:   Calvin J. Hamilton

Surface containing many craters and naturally occurring channels;

Rotational period (hours) 24.6229

Rotational period (days) 1.025957

Orbital period (days) 686.98

Mean orbital velocity (km/sec) 24.13

Minimum surface temperature -140°C

Mean surface temperature -63°C

Maximum surface temperature 20°C

Atmospheric composition Carbon Dioxide (C02)

Nitrogen (N2)

Argon (Ar) Oxygen (O2)

Carbon Monoxide (CO)Water (H2O)

Neon (Ne) Krypton (Kr)Xenon (Xe)Ozone (O3)

95.32%2.7%1.6%

0.13%0.07%0.03%

0.00025%0.00003%

0.000008%

Produced by:   Calvin J. Hamilton

Blue-green color

Discovered by William Herschel

Date of discovery 1781

Rotational period (hours) -17.9

Orbital period (years) 84.01

Mean orbital velocity (km/sec) 6.81

Mean cloud temperature -193°C

Atmospheric composition HydrogenHeliumMethane

83%15%

2%

Another 12 satellites have been recently discovered.

Rotational period (days) 0.41354

Orbital period (days) 4332.71

Mean orbital velocity (km/sec) 13.07

Mean cloud temperature -121°C

Atmospheric composition HydrogenHelium

90%10%