Astro-Physical Calculator
The Units switch above does not change the units of your calculation! It only specifies the units of the constants buttons for future entries!
| NAME | SYMBOL | NUMBER | CGS UNITS |
| Velocity of light | c | 2.998 x 1010 | cm s-1 |
| Planck constant | h | 6.626 x 10-27 | erg s |
| Gravitational constant | G | 6.67 x 10-8 | cm3 g-1 s-2 |
| Electron charge | e | 4.803 x 10-10 | esu |
| Mass of electron | m_e | 9.1096 x 10-28 | g |
| Mass of proton | m_p | 1.6724 x 10-24 | g |
| Mass of neutron | m_n | 1.6747 x 10-24 | g |
| Mass of hydrogen | m_H | 1.6733 x 10-24 | g |
| Atomic mass unit | amu | 1.661 x 10-24 | g |
| Avagadro's number | N_A | 6.0222 x 1023 | |
| Boltzmann constant | k | 1.38 x 10-16 | erg K-1 |
| Electron volt | ev | 1.602 x 10-12 | erg |
| Rad'n density constant | a | 7.5646 x 10-15 | erg cm-3 K-4 |
| Stefan-Boltzmann const | sigma | 5.67 x 10-5 | erg cm-2 K-4 s-1 |
| Thomson cross section | sigma_T | 6.6524 x 10-25 | cm2 |
| Electron rest mass energy | E_e | 8.18710414 x 10-7 | erg |
| Fine structure constant | \alpha | 7.29735308 x 10-3 | |
| Rydberg constant | R | 2.17992 x 10-11 | erg |
| Year | yr | 3.156 x 107 | s |
| Astronomical unit | AU | 1.496 x 1013 | cm |
| Parsec | pc | 3.086 x 1018 | cm |
| Light year | ly | 9.463 x 1017 | cm |
| Solar mass | M_sun | 1.99 x 1033 | g |
| Solar radius | R_sun | 6.96 x 1010 | cm |
| Solar Luminosity | L_sun | 3.9 x 1033 | erg s-1 |
| Solar Temperature | T_sun | 5780 | K |
In the calculator above, the Period has been converted to seconds and the Semi-Major Axis has been changed to cm.
| Name | Mass (g) | Radius (cm) | Period (yr) | Semi-Major (AU) | Eccentricity |
|---|---|---|---|---|---|
| Mercury | 3.303 x 1026 | 2.439 x 108 | 2.4085 x 10-1 | 3.87096 x 10-1 | 0.205622 |
| Venus | 4.87 x 1027 | 6.05 x 108 | 6.1521 x 10-1 | 7.23342 x 10-1 | 0.006783 |
| Earth | 5.976 x 1027 | 6.378 x 108 | 1.00004 x 100 | 9.99987 x 10-1 | 0.016684 |
| Mars | 6.418 x 1026 | 3.397 x 108 | 1.88089 x 100 | 1.523705 x 100 | 0.093404 |
| Jupiter | 1.899 x 1030 | 7.14 x 109 | 1.18622 x 101 | 5.204529 x 100 | 0.047826 |
| Saturn | 5.686 x 1029 | 6 x 109 | 2.94577 x 101 | 9.575133 x 100 | 0.052754 |
| Uranus | 8.66 x 1028 | 2.615 x 109 | 8.40139 x 101 | 1.930375 x 101 | 0.050363 |
| Neptune | 1.03 x 1029 | 2.43 x 109 | 1.64793 x 102 | 3.020652 x 101 | 0.004014 |
| Pluto | 1 x 1025 | 1.2 x 108 | 2.47686 x 102 | 3.991136 x 101 | 0.256695 |
This is basically the calculator on Chris Dolan's webpage with a couple more buttons added for high-energy astrophysicists. This particular version came (with permission) from the Dipankar Maitra web site. Most of the JavaScript code for this calculator came from the Scientific Calculator by Rolf Howarth.
Constants Page -
Physical Constants and Astronomical Data, by Chris Dolan.
Conversions
Page - Fundamental astronomical conversions, by Ulrich Hopp.
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This web page was last updated 09/15/17