Pulsars and neutron stars/Useful parameters and constants

From Wikibooks, open books for an open world
< Pulsars and neutron stars
Jump to navigation Jump to search
  • Speed of light: 299 792 458m/s
  • 1 parsec = 3.0857 x 1016m = 3.26156 ly
  • 1 G = 10-4 T

The solar system[edit | edit source]

  • 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[edit | edit source]

Modified Julian Date[edit | edit source]

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
Retrieved from "https://en.wikibooks.org/w/index.php?title=Pulsars_and_neutron_stars/Useful_parameters_and_constants&oldid=3116696"