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Pulsars and neutron stars/Useful parameters and constants

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  • Speed of light: 299 792 458m/s
  • 1 parsec = 3.0857 x 1016m = 3.26156 ly
  • 1 G = 10-4 T

The solar system

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  • 1 astronomical unit AU: 1.4960 x 1011m
Planet Mass (solar mass) Orbital period (yr) Semi-major axis (AU)
Mercury 0.24 0.39
Venus 0.62 0.72
Earth 1.00 1.00
Mars 1.88 1.52
Jupiter 11.86 5.20
Saturn 29.46 9.54
Uranus 84.01 19.22
Neptune 164.8 30.06


Time and dates

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Modified Julian Date

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Date MJD
17th Nov 1858 0
1 Jan 1968 39856
1 Jan 1980 44239
1 Jan 1990 47892
1 Jan 1995 49718
1 Jan 2000 51544
1 Jan 2005 53371
1 Jan 2010 55197
1 Jan 2015 57023
1 Jan 2016 57388
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