Appendix 7: Some Important Astronomical Quantities

Astronomical Unit 1 AU = 1.4960 × 1011 m
    = 1.4960 × 108 km
Light-year 1 ly = 9.4605 × 1015 m
    = 63,240 AU
Parsec 1 pc = 3.2616 ly
    = 3.0857 × 1016 m
    = 206,265 AU
Year 1 y = 365.2564 days
    = 3.156 × 107 s
Solar mass 1 M = 1.989 × 1030 kg
Solar Radius 1 R = 6.9599 × 108 m
Solar Luminosity 1 L = 3.90 × 1026 W