def _getCoeffsOther(self, ephs):
"""Calculate coefficients for the ra/dec values of a single objects ephemerides.
Parameters
----------
ephs : numpy.ndarray
The structured array returned by PyOrbEphemerides holding ephemeris values, for one object.
Returns
-------
dict
Dictionary containing the coefficients for each of 'delta', 'vmag', 'elongation'
dict
Dictionary containing the max residual values for each of 'delta', 'vmag', 'elongation'.
"""
coeffs = {}
max_resids = {}
for key, ephValue in zip(('delta', 'vmag', 'elongation'),
('delta', 'magV', 'solarelon')):
coeffs[key], resid, rms, max_resids[key] = cheb.chebfit(
ephs['time'],
ephs[ephValue],
dxdt=None,
xMultiplier=self.multipliers[key][0],
dxMultiplier=self.multipliers[key][1],
nPoly=self.nCoeff[key])
return coeffs, max_resids
def _getCoeffsPosition(self, ephs):
"""Calculate coefficients for the ra/dec values of a single objects ephemerides.
Parameters
----------
times : numpy.ndarray
The times of the ephemerides.
ephs : numpy.ndarray
The structured array returned by PyOrbEphemerides holding ephemeris values, for one object.
Returns
-------
numpy.ndarray
The ra coefficients
numpy.ndarray
The dec coefficients
float
The positional error residuals between fit and ephemeris values, in mas.
"""
dradt_coord = ephs['dradt'] / np.cos(np.radians(ephs['dec']))
coeff_ra, resid_ra, rms_ra_resid, max_ra_resid = cheb.chebfit(
ephs['time'],
three_sixty_to_neg(ephs['ra']),
dxdt=dradt_coord,
xMultiplier=self.multipliers['position'][0],
dxMultiplier=self.multipliers['position'][1],
nPoly=self.nCoeff['position'])
coeff_dec, resid_dec, rms_dec_resid, max_dec_resid = cheb.chebfit(
ephs['time'],
ephs['dec'],
dxdt=ephs['ddecdt'],
xMultiplier=self.multipliers['position'][0],
dxMultiplier=self.multipliers['position'][1],
nPoly=self.nCoeff['position'])
max_pos_resid = np.max(
np.sqrt(resid_dec**2 +
(resid_ra * np.cos(np.radians(ephs['dec'])))**2))
# Convert position residuals to mas.
max_pos_resid *= 3600.0 * 1000.0
return coeff_ra, coeff_dec, max_pos_resid
def _getCoeffsPosition(self, ephs):
"""Calculate coefficients for the ra/dec values of a single objects ephemerides.
Parameters
----------
times : numpy.ndarray
The times of the ephemerides.
ephs : numpy.ndarray
The structured array returned by PyOrbEphemerides holding ephemeris values, for one object.
Returns
-------
numpy.ndarray
The ra coefficients
numpy.ndarray
The dec coefficients
float
The positional error residuals between fit and ephemeris values, in mas.
"""
dradt_coord = ephs['dradt'] / np.cos(np.radians(ephs['dec']))
coeff_ra, resid_ra, rms_ra_resid, max_ra_resid = cheb.chebfit(ephs['time'],
three_sixty_to_neg(ephs['ra']),
dxdt=dradt_coord,
xMultiplier=self.multipliers['position'][0],
dxMultiplier=self.multipliers['position'][1],
nPoly=self.nCoeff['position'])
coeff_dec, resid_dec, rms_dec_resid, max_dec_resid = cheb.chebfit(ephs['time'], ephs['dec'],
dxdt=ephs['ddecdt'],
xMultiplier=self.multipliers['position'][0],
dxMultiplier=self.multipliers['position'][1],
nPoly=self.nCoeff['position'])
max_pos_resid = np.max(np.sqrt(resid_dec**2 +
(resid_ra * np.cos(np.radians(ephs['dec'])))**2))
# Convert position residuals to mas.
max_pos_resid *= 3600.0 * 1000.0
return coeff_ra, coeff_dec, max_pos_resid
def _getCoeffsOther(self, ephs):
"""Calculate coefficients for the ra/dec values of a single objects ephemerides.
Parameters
----------
ephs : numpy.ndarray
The structured array returned by PyOrbEphemerides holding ephemeris values, for one object.
Returns
-------
dict
Dictionary containing the coefficients for each of 'delta', 'vmag', 'elongation'
dict
Dictionary containing the max residual values for each of 'delta', 'vmag', 'elongation'.
"""
coeffs = {}
max_resids = {}
for key, ephValue in zip(('delta', 'vmag', 'elongation'), ('delta', 'magV', 'solarelon')):
coeffs[key], resid, rms, max_resids[key] = cheb.chebfit(ephs['time'], ephs[ephValue],
dxdt=None,
xMultiplier=self.multipliers[key][0],
dxMultiplier=self.multipliers[key][1],
nPoly=self.nCoeff[key])
return coeffs, max_resids
