def new_system_of_sun_and_earth(self):
stars = datamodel.Stars(2)
sun = stars[0]
sun.mass = units.MSun(1.0)
sun.position = units.m(numpy.array((0.0, 0.0, 0.0)))
sun.velocity = units.ms(numpy.array((0.0, 0.0, 0.0)))
sun.radius = units.RSun(1.0)
earth = stars[1]
earth.mass = units.kg(5.9736e24)
earth.radius = units.km(6371)
earth.position = units.km(numpy.array((149.5e6, 0.0, 0.0)))
earth.velocity = units.ms(numpy.array((0.0, 29800, 0.0)))
return stars
def new_system_of_sun_and_earth_and_moon(self):
stars = datamodel.Stars(3)
sun = stars[0]
sun.mass = units.MSun(1.0)
sun.position = units.m(numpy.array((0.0, 0.0, 0.0)))
sun.velocity = units.ms(numpy.array((0.0, 0.0, 0.0)))
sun.radius = units.RSun(1.0)
earth = stars[1]
earth.mass = units.kg(5.9736e24)
earth.radius = units.km(6371)
earth.position = units.km(numpy.array((149.5e6, 0.0, 0.0)))
earth.velocity = units.ms(numpy.array((0.0, 29800, 0.0)))
moon = stars[2]
moon.mass = units.kg(7.3477e22)
moon.radius = units.km(1737.10)
moon.position = units.km(numpy.array((149.5e6 + 384399.0, 0.0, 0.0)))
moon.velocity = ([0.0, 1.022, 0] | units.km / units.s) + earth.velocity
return stars
def setup_solar_system(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
stars = datamodel.Stars(8)
sun = stars[0]
sun.mass = units.MSun(1.0)
sun.position = units.AU(array((0.0,0.0,0.0)))
sun.velocity = units.AUd(array((0.0,0.0,0.0)))
sun.radius = units.RSun(1.0)
mercury = stars[1]
mercury.mass = units.kg( 3.302e23)
mercury.radius = units.km(2440)
mercury.position = units.AU(array((-1.812507519383936E-01, -4.238556570722329E-01, -1.858336536398257E-02)))
mercury.velocity = units.AUd(array((2.028905659997442E-02, -9.482619060967475E-03, -2.636707283074494E-03)))
venus = stars[2]
venus.mass = units.kg(48.685e23)
venus.radius = units.km(6051.8)
venus.position = units.AU(array((7.174859394658725E-01, -9.118094489213757E-02, -4.286369239375957E-02)))
venus.velocity = units.AUd(array((2.569149540621095E-03, 1.995467986481682E-02, 1.246915402703626E-04)))
earth = stars[3]
earth.mass = units.kg(5.9736e24)
earth.radius = units.km(6371)
earth.position = units.AU(array(( 4.152751345538410E-01, 8.988236789078493E-01, -4.821560120168533E-05)))
earth.velocity = units.AUd(array(( -1.588315644843389E-02, 7.210443860976745E-03, -1.350251461569625E-07)))
moon = stars[4]
moon.mass = units.kg(7.35e22)
moon.radius = units.km(1738)
moon.position = units.AU(array(( 4.138191074397691E-01, 8.965602570292573E-01, -2.762446418149536E-04)))
moon.velocity = units.AUd(array(( -1.541527312550390E-02, 6.894586206029982E-03, 1.223837010915995E-05)))
mars = stars[5]
mars.mass = units.kg(6.4185e23)
mars.radius = units.km(3389.9)
mars.position = units.AU(array(( -5.350147323170708E-01, -1.400272441929516E+00, -1.637545552747233E-02)))
mars.velocity = units.AUd(array(( 1.360625065710822E-02, -3.765876077406818E-03, -4.130340644254660E-04)))
jupiter = stars[6]
jupiter.mass = units.kg(1898.13e24)
jupiter.radius = units.km(71492)
jupiter.position = units.AU(array(( 2.503092399973117E+00, -4.468134118102924E+00, -3.752173268244928E-02)))
jupiter.velocity = units.AUd(array(( 6.490840561446090E-03, 4.046895067472646E-03, -1.620422227298534E-04)))
saturn = stars[7]
saturn.mass = units.kg(5.68319e26 )
saturn.radius = units.km(58232)
saturn.position = units.AU(array(( -9.023156820924056E+00, 2.468810475231705E+00, 3.161126539154331E-01)))
saturn.velocity = units.AUd(array(( -1.769097295887704E-03, -5.393257979873611E-03, 1.639859191780030E-04 )))
dist = earth.position - moon.position
print "distance vector"+str(dist)
print "distance %s\n" % (dot(dist,dist)**0.5).as_quantity_in(units.m)#(dist*dist).sum()**0.5
velo = moon.velocity-earth.velocity
print "orb velocity %s\n" % (dot(velo,velo)**0.5).as_quantity_in(units.m/units.s)
return stars