| astronomical unit |
AU |
1.496E+13 |
cm |
| atomic mass unit, m(12C)/12 |
u |
1.661E-24 |
gm |
| Avogadro's number |
NA |
6.022E+23 |
mole-1 |
| Boltzmann's constant |
k |
1.381E-16 |
erg K-1 |
| day |
day |
8.640E+04 |
s |
| day, sidereal |
|
8.616E+04 |
s |
| electron mass |
me |
9.109E-28 |
gm |
| elementary charge |
qe |
4.803E-10 |
esu |
| fine-structure constant |
α |
7.297E-03 |
|
|
1/α |
1.370E+02 |
|
| hydrogen atomic mass (in populations) |
mH |
1.008 |
u |
| hydrogen molecular mass (in populations) |
mH2 |
2.016 |
u |
| light year |
ly |
9.461E+17 |
cm |
| neutron mass |
mn |
1.675E-24 |
gm |
|
|
1.009E+00 |
u |
| Newton's constant of gravitation |
G |
6.674E-08 |
cm3
gm-1
s-2 |
| parsec |
pc |
1.377E-02 |
cm |
| Planck's constant |
h |
6.626E-27 |
erg s |
| |
ħ = h/2π |
1.055E-27 |
erg s |
| proton mass |
mp |
1.673E-24 |
gm |
|
|
1.007E+00 |
u |
| solar irradiance at Earth |
fÅ |
1.361E+06 |
erg s-1
cm-2 |
| solar luminosity |
Le |
3.828E+33 |
erg s-1 |
| solar mass |
Me |
1.988E+33 |
gm |
| solar mass parameter |
GMe |
1.327E+26 |
dyne cm2 |
| solar photospheric radius |
Re |
6.957E+10 |
cm |
| solar photospheric temperature |
Tee |
5.771E+03 |
K |
| speed of light in vacuum |
c |
2.998E+10 |
cm s-1 |
| standard acceleration of gravity |
g |
9.807E+02 |
cm s-2 |
| standard atmospheric pressure |
atm |
1.013E+06 |
dyne cm-2 |
| Stefan-Boltzmann constant |
σ |
5.670E-05 |
erg s-1
cm-2
K-4 |
| vacuum electric permittivity |
ε0 |
no such thing in cgs |
| vacuum magnetic permeability |
μ0 |
no such thing in cgs |
| year, sidereal |
|
3.156E+07 |
s |
| year, tropical |
yr |
3.156E+07 |
s |
