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Planet Tables
| Quantity | Value |
|---|---|
| astronomical unit (A.U.) | 149,597,870.691 kilometers |
| light year (ly) | 9.460536207× 1012 km = 63,240 A.U. |
| parsec (pc) | 3.08567802× 1013 km = 206,265 A.U. |
| sidereal year | 365.2564 days |
| tropical year | 365.2422 days |
| Gregorian year | 365.2425 days |
| Earth mass | 5.9736× 1024 kilograms |
| Sun mass | 1.9891× 1030 kg = 332,980 × Earth |
| mean Earth radius | 6371 kilometers |
| Sun radius | 6.96265 × 105 km = 109 × Earth |
| Sun luminosity | 3.827× 1026 watts |
| Quantity | Value |
|---|---|
| speed of light (c) | 299,792.458 kilometers/second |
| gravitational constant (G) | 6.6726× 10-11 m3 /(kg sec2) |
| Boltzmann constant (k) | 1.380658 × 10-23 Joules/Kelvin |
| Stefan-Boltzmann constant (s) | 5.67051× 10-8 J/(m2 K4 s) |
| Wien's law constant | 2.897756× 106 nanometers Kelvin |
| Planck constant (h) | 6.6260755× 10-34 Joules second |
| electron mass | 9.1093898× 10-28 grams = 5.48579903× 10-4 amu |
| proton mass | 1.6726231× 10-24 grams = 1.007276470 amu |
| neutron mass | 1.6749286× 10-24 grams = 1.008664904 amu |
| deuterium nucleus mass | 3.3435860× 10-24 grams = 2.013553214 amu |
last updated: 27 May 2001