lsst.pipe.tasks.ssp.photfit Namespace Reference

Functions
	HG_model (phase, params)
	HG1G2_model (phase, params)
	HG12_model (phase, params)
	HG12star_model (phase, params)
	chi2 (params, mag, phase, mag_err, model)
	fit (mag, phase, sigma, model=HG12_model, params=[0.1])
	fitHG12 (mag, magSigma, phaseAngle, tdist, rdist)
	phase_angle_deg (r_obj_sun, r_obs_sun)
	hg_V_mag (H, G, r, delta, phase_deg)

Variables
list	A = [3.332, 1.862]
list	B = [0.631, 1.218]
list	C = [0.986, 0.238]
	alpha_12 = np.deg2rad([7.5, 30.0, 60, 90, 120, 150])
list	phi_1_sp = [7.5e-1, 3.3486016e-1, 1.3410560e-1, 5.1104756e-2, 2.1465687e-2, 3.6396989e-3]
list	phi_1_derivs = [-1.9098593, -9.1328612e-2]
list	phi_2_sp = [9.25e-1, 6.2884169e-1, 3.1755495e-1, 1.2716367e-1, 2.2373903e-2, 1.6505689e-4]
list	phi_2_derivs = [-5.7295780e-1, -8.6573138e-8]
	alpha_3 = np.deg2rad([0.0, 0.3, 1.0, 2.0, 4.0, 8.0, 12.0, 20.0, 30.0])
list	phi_3_sp
list	phi_3_derivs = [-1.0630097, 0]
	phi_1 = CubicSpline(alpha_12, phi_1_sp, bc_type=((1, phi_1_derivs[0]), (1, phi_1_derivs[1])))
	phi_2 = CubicSpline(alpha_12, phi_2_sp, bc_type=((1, phi_2_derivs[0]), (1, phi_2_derivs[1])))
	phi_3 = CubicSpline(alpha_3, phi_3_sp, bc_type=((1, phi_3_derivs[0]), (1, phi_3_derivs[1])))

Function Documentation

chi2()

lsst.pipe.tasks.ssp.photfit.chi2	(		params,
			mag,
			phase,
			mag_err,
			model )

Definition at line 97 of file photfit.py.

fit()

lsst.pipe.tasks.ssp.photfit.fit	(		mag,
			phase,
			sigma,
			model = HG12_model,
			params = [0.1] )

Definition at line 102 of file photfit.py.

fitHG12()

lsst.pipe.tasks.ssp.photfit.fitHG12	(		mag,
			magSigma,
			phaseAngle,
			tdist,
			rdist )

Definition at line 110 of file photfit.py.

HG12_model()

lsst.pipe.tasks.ssp.photfit.HG12_model	(		phase,
			params )

Definition at line 79 of file photfit.py.

HG12star_model()

lsst.pipe.tasks.ssp.photfit.HG12star_model	(		phase,
			params )

Definition at line 90 of file photfit.py.

HG1G2_model()

lsst.pipe.tasks.ssp.photfit.HG1G2_model	(		phase,
			params )

Definition at line 62 of file photfit.py.

HG_model()

lsst.pipe.tasks.ssp.photfit.HG_model	(		phase,
			params )

Definition at line 44 of file photfit.py.

hg_V_mag()

lsst.pipe.tasks.ssp.photfit.hg_V_mag	(		H,
			G,
			r,
			delta,
			phase_deg )

Compute apparent V magnitude from the IAU H–G system.

Parameters
----------
H : float or ndarray
    Absolute magnitude (V-band).
G : float or ndarray
    Slope parameter.
r : float or ndarray
    Heliocentric distance in AU.
delta : float or ndarray
    Observer distance (Δ) in AU.
phase_deg : float or ndarray
    Phase angle in degrees.

Definition at line 178 of file photfit.py.

phase_angle_deg()

lsst.pipe.tasks.ssp.photfit.phase_angle_deg	(		r_obj_sun,
			r_obs_sun )

Compute phase angle (Sun–Object–Observer) in degrees.

Parameters
----------
r_obj_sun : array, shape (3,) or (3, N)
    Object position vector wrt Sun (Sun → object).
r_obs_sun : array, shape (3,) or (3, N)
    Observer position vector wrt Sun (Sun → observer).

Returns
-------
float or ndarray
    Phase angle(s) in degrees, in [0, 180].

Definition at line 144 of file photfit.py.

Variable Documentation

A

list lsst.pipe.tasks.ssp.photfit.A = [3.332, 1.862]

Definition at line 8 of file photfit.py.

alpha_12

lsst.pipe.tasks.ssp.photfit.alpha_12 = np.deg2rad([7.5, 30.0, 60, 90, 120, 150])

Definition at line 14 of file photfit.py.

alpha_3

lsst.pipe.tasks.ssp.photfit.alpha_3 = np.deg2rad([0.0, 0.3, 1.0, 2.0, 4.0, 8.0, 12.0, 20.0, 30.0])

Definition at line 22 of file photfit.py.

B

list lsst.pipe.tasks.ssp.photfit.B = [0.631, 1.218]

Definition at line 9 of file photfit.py.

C

list lsst.pipe.tasks.ssp.photfit.C = [0.986, 0.238]

Definition at line 10 of file photfit.py.

phi_1

lsst.pipe.tasks.ssp.photfit.phi_1 = CubicSpline(alpha_12, phi_1_sp, bc_type=((1, phi_1_derivs[0]), (1, phi_1_derivs[1])))

Definition at line 39 of file photfit.py.

phi_1_derivs

list lsst.pipe.tasks.ssp.photfit.phi_1_derivs = [-1.9098593, -9.1328612e-2]

Definition at line 17 of file photfit.py.

phi_1_sp

list lsst.pipe.tasks.ssp.photfit.phi_1_sp = [7.5e-1, 3.3486016e-1, 1.3410560e-1, 5.1104756e-2, 2.1465687e-2, 3.6396989e-3]

Definition at line 16 of file photfit.py.

phi_2

lsst.pipe.tasks.ssp.photfit.phi_2 = CubicSpline(alpha_12, phi_2_sp, bc_type=((1, phi_2_derivs[0]), (1, phi_2_derivs[1])))

Definition at line 40 of file photfit.py.

phi_2_derivs

list lsst.pipe.tasks.ssp.photfit.phi_2_derivs = [-5.7295780e-1, -8.6573138e-8]

Definition at line 20 of file photfit.py.

phi_2_sp

list lsst.pipe.tasks.ssp.photfit.phi_2_sp = [9.25e-1, 6.2884169e-1, 3.1755495e-1, 1.2716367e-1, 2.2373903e-2, 1.6505689e-4]

Definition at line 19 of file photfit.py.

phi_3

lsst.pipe.tasks.ssp.photfit.phi_3 = CubicSpline(alpha_3, phi_3_sp, bc_type=((1, phi_3_derivs[0]), (1, phi_3_derivs[1])))

Definition at line 41 of file photfit.py.

phi_3_derivs

list lsst.pipe.tasks.ssp.photfit.phi_3_derivs = [-1.0630097, 0]

Definition at line 36 of file photfit.py.

phi_3_sp

list lsst.pipe.tasks.ssp.photfit.phi_3_sp

Initial value:

=  [
    1.0,
    8.3381185e-1,
    5.7735424e-1,
    4.2144772e-1,
    2.3174230e-1,
    1.0348178e-1,
    6.1733473e-2,
    1.6107006e-2,
    0.0,
]

Definition at line 24 of file photfit.py.