Astronomical Constants and Units
Constants
| Name |
Symbol |
Number |
Units |
| Speed of Light |
c |
2.99792458 x1010 |
cm s-1 |
| Plank Constant |
h |
6.6260755(40) x10-27 |
ergs s |
| Boltzmann constant |
k |
1.380658(12) x10-16 |
ergs K-1 |
| Mass of hydrogen |
mH |
1.6733 x10-24 |
g |
| Mass of proton |
mp |
1.6726231(10) x10-24 |
g |
H2 dissociation energy
(Liu et al. 2009) |
D0(H2) |
36 118.069 62(37) |
cm-1 |
para-H2 ionization energy
(Liu et al. 2009) |
Ei(para-H2) |
124 417.491 13(37) |
cm-1 |
ortho-H2 ionization energy
(Liu et al. 2009) |
Ei(ortho-H2) |
124 357.237 97(36) |
cm-1 |
Conversions
| Unit |
Other Unit |
| erg |
5.0345 x1015 cm-1 |