Units: CGS SI    

 






Physical Constants


Astronomical Constants


Planetary Data
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

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

Most of the JavaScript code for this calculator came (with permission) from the
Scientific Calculator by Rolf Howarth. (rolf@insect.demon.co.uk)   Chris Dolan's Home Page