Introduction to Astrophysics/Astronomical Constants

Speed of light: c = 2.99792458 × 10⁸ m s^-1
Gravitation Constant: G = 6.6742(10) × 10^-11 m³ kg^-1s^-2
Mass of Sun: M_sun = 1.99 × 10³⁰ kg
Luminosity of Sun: L_sun = 3.83 × 10²⁶ J s^-1
Radius of Sun: R_sun = 6.96 × 10⁸ m
1 astronomical unit (AU): 1.496 × 10¹¹ m
1 light year (ly): 9.461 × 10¹⁵ m = 0.307 pc
1 parsec (pc): 3.086 × 10¹⁶ m = 3.26 ly
Solar effective temperature: T_eff = 5777 K
Hubble Constant: H₀ = 70.1±1.3 kms^-1 Mpc^-1
Cosmological Constant: |Λ|≤10^-51 m^-2
Cosmic background radiation = 2.725(1) K
Mass of Earth: M_e = 5.97370(76) × 10²⁴ kg
Radius of Earth: R_e = 6.378136 × 10⁶ m

External links

• NIST Physical Constants