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C.6 Physical Constants

The physical constants included in CASA can be found in Table C.10.


Table C.10: Physical Constants

ConstantName Value
pi 3.14.. 3.14159
ee 2.71.. 2.71828
c light vel. 2.99792×108 m s-1
G grav. const 6.67259×1011 N m2 kg-2
h Planck const 6.62608×10-34 J s
HI HI line 1420.41 MHz
R gas const 8.31451 J K-1 mol-1
NA Avogadro # 6.02214×1023 mol-1
e electron charge 1.60218×10-19 C
mp proton mass 1.67262×10-27 kg
mp_me mp/me 1836.15
mu0 permeability vac.1.25664×10-6 H m-1
eps0 permittivity vac. 1.60218×10-19 C
k Boltzmann const1.38066×10-23 J K-1
F Faraday const 96485.3 C mol-1
me electron mass 9.10939×10-31 kg
re electron radius 2.8179e×10-15 m
a0 Bohrs radius 5.2918×10-11 m
R0 solar radius 6.9599×108 m
k2 IAU grav. const20.000295912 AU3 d-2 S0-1

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