def kepler_state(self, dt):
sma, ecc, inc, node, peri, true_ano = self.elements
mean_ano = kepler.true_to_mean(true_ano, ecc)
mean_ano1 = dt*self.mean_motion + mean_ano
true_ano1 = kepler.mean_to_true(mean_ano1, ecc)
rv = kepler.cartesian(self.body.mu, sma, ecc, inc, node, peri, true_ano1)
return State(rv[:3]*self.r.unit, rv[3:]*self.v.unit,
self.t+TimeDelta(dt, format='sec'),
self.frame, self.body)
def kepler_state(self, dt):
sma, ecc, inc, node, peri, true_ano = self.elements
mean_ano = kepler.true_to_mean(true_ano, ecc)
mean_ano1 = dt * self.mean_motion + mean_ano
true_ano1 = kepler.mean_to_true(mean_ano1, ecc)
rv = kepler.cartesian(self.body.mu, sma, ecc, inc, node, peri,
true_ano1)
return State(rv[:3] * self.r.unit, rv[3:] * self.v.unit,
self.t + TimeDelta(dt, format='sec'), self.frame,
self.body)
def kepler_orbit(self, n=100):
dt = np.linspace(0, self.period, n)
sma, ecc, inc, node, peri, ano1 = self.elements
mean_ano = kepler.true_to_mean(ano1, ecc)
mean_ano1 = dt*self.mean_motion + mean_ano
ano = units.Quantity([kepler.mean_to_true(m, ecc) for m in mean_ano1])
sma = np.repeat(sma, n)
ecc = np.repeat(ecc, n)
inc = np.repeat(inc, n)
node = np.repeat(node, n)
peri = np.repeat(peri, n)
epochs = self.t + TimeDelta(dt, format='sec')
states = kepler.cartesian(self.body.mu, sma, ecc, inc, node, peri, ano)
return Orbit(
deepcopy(self), dt, epochs, states,
elements=[sma, ecc, inc, node, peri, ano]
)
def kepler_orbit(self, n=100):
dt = np.linspace(0, self.period, n)
sma, ecc, inc, node, peri, ano1 = self.elements
mean_ano = kepler.true_to_mean(ano1, ecc)
mean_ano1 = dt * self.mean_motion + mean_ano
ano = units.Quantity([kepler.mean_to_true(m, ecc) for m in mean_ano1])
sma = np.repeat(sma, n)
ecc = np.repeat(ecc, n)
inc = np.repeat(inc, n)
node = np.repeat(node, n)
peri = np.repeat(peri, n)
epochs = self.t + TimeDelta(dt, format='sec')
states = kepler.cartesian(self.body.mu, sma, ecc, inc, node, peri, ano)
return Orbit(deepcopy(self),
dt,
epochs,
states,
elements=[sma, ecc, inc, node, peri, ano])