def new_lunar_system_in_time(time_JD=2457099.5|units.day):
"""
Initial conditions of Solar system --
particle set with the sun + eight moons,
at the center-of-mass reference frame.
Defined attributes:
name, mass, radius, x, y, z, vx, vy, vz
"""
time_0 = 2457099.5 | units.day
delta_JD = time_JD-time_0
solar_system = solar_system_in_time(time_JD)
solar_system[0].type = "star"
solar_system[0].name = "sun"
solar_system[1:].type = "planet"
for pi in solar_system:
moons = get_moons_for_planet(pi, delta_JD=delta_JD)
solar_system.add_particles(moons)
solar_system.move_to_center()
### to compare with JPL, relative positions and velocities need to be corrected for the
# Sun's vectors with respect to the barycenter
#r_s = (3.123390770608490E-03, -4.370830943817017E-04, -1.443425433116342E-04) | units.AU
#v_s = (3.421633816761503E-06, 5.767414405893875E-06, -8.878039607570240E-08) | (units.AU / units.day)
#print sun
#print moons.position.in_(units.AU) + r_s
#print moons.velocity.in_(units.AU/units.day) + v_s
return solar_system
def new_lunar_system_in_time(time_JD=2457099.5 | units.day):
"""
Initial conditions of Solar system --
particle set with the sun + eight moons,
at the center-of-mass reference frame.
Defined attributes:
name, mass, radius, x, y, z, vx, vy, vz
"""
time_0 = 2457099.5 | units.day
delta_JD = time_JD - time_0
solar_system = solar_system_in_time(time_JD)
solar_system[0].type = "star"
solar_system[0].name = "sun"
solar_system[1:].type = "planet"
for pi in solar_system:
moons = get_moons_for_planet(pi, delta_JD=delta_JD)
solar_system.add_particles(moons)
solar_system.move_to_center()
### to compare with JPL, relative positions and velocities need to be corrected for the
# Sun's vectors with respect to the barycenter
#r_s = (3.123390770608490E-03, -4.370830943817017E-04, -1.443425433116342E-04) | units.AU
#v_s = (3.421633816761503E-06, 5.767414405893875E-06, -8.878039607570240E-08) | (units.AU / units.day)
#print sun
#print moons.position.in_(units.AU) + r_s
#print moons.velocity.in_(units.AU/units.day) + v_s
return solar_system
def get_nice_model_conditions():
converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.AU)
time_0 = 2457099.5 | units.day
time_JD = 2457099.5 | units.day
delta_JD = time_JD - time_0
solar_system = solar_system_in_time(time_JD)
solar_system.hosttype = "star"
solar_system[0].type = "star"
solar_system[0].name = "sun"
solar_system[1:].type = "planet"
solar_system[1:].hostname = "sun"
sun = solar_system[solar_system.name == "sun"]
solar_system.position -= sun.position
solar_system.velocity -= sun.velocity
nice_system = Particles()
nice_system.add_particle(sun)
nice_system.name = "Sun"
nice_system.type = "star"
sma = 15 | units.AU
for name in names:
planet = rescale_planetary_orbit(sun, solar_system, name, sma)
nice_system.add_particles(planet)
porb = 1. / 2. * orbital_period(sun.mass, sma)
sma = semimajor_axis(sun.mass, porb)
nice_system.move_to_center()
return nice_system
pyplot.text(0.0031, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(45000|units.yr):
pyplot.text(0.0028, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(55000|units.yr):
pyplot.text(0.0021, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(65000|units.yr):
pyplot.text(0.0017, e+0.002, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(75000|units.yr):
pyplot.text(0.0014, e-0.002, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(85000|units.yr):
pyplot.text(0.0014, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
else:
pyplot.text((a-a0).value_in(units.AU), e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
gravity.evolve_model(gravity.model_time + dt)
channel_from_to_SunEarth.copy()
gravity.stop()
pyplot.xlabel(x_label)
pyplot.ylabel(y_label)
# pyplot.show()
pyplot.savefig("EarthOrbitVariation")
return
if __name__ in ('__main__','__plot__'):
particles = solar_system_in_time(time_JD=2474649.5|units.day)
integrate_solar_system(particles, 84000 | units.yr)
pyplot.text(0.0028, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(55000|units.yr):
pyplot.text(0.0021, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(65000|units.yr):
pyplot.text(0.0017, e+0.002, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
elif gravity.model_time<=(75000|units.yr):
pyplot.text(0.0014, e-0.002, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
#elif gravity.model_time<=(85000|units.yr):
# pyplot.text(0.0014, e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
else:
pass
# pyplot.text((a-a0).value_in(units.AU), e, "{0:.0f}".format(0.001*gravity.model_time.value_in(units.yr))+"kyr")
gravity.evolve_model(gravity.model_time + dt)
channel_from_to_SunEarth.copy()
gravity.stop()
pyplot.xlabel(x_label)
pyplot.ylabel(y_label)
pyplot.xlim(-0.001, 0.004)
# pyplot.show()
pyplot.savefig("EarthOrbitVariation")
return
if __name__ in ('__main__','__plot__'):
particles = solar_system_in_time(time_JD=2474649.5|units.day)
integrate_solar_system(particles, 84000 | units.yr)