HG¶
- class sbpy.photometry.HG(*args, **kwargs)[source]¶
Bases:
DiskIntegratedPhaseFunc
HG photometric phase model (Bowell et al. 1989)
Examples
>>> # Define the phase function for Ceres with H = 3.34, G = 0.12 >>> import astropy.units as u >>> from sbpy.calib import solar_fluxd >>> from sbpy.photometry import HG >>> ceres = HG(3.34 * u.mag, 0.12, radius = 480 * u.km, wfb = 'V') >>> with solar_fluxd.set({'V': -26.77 * u.mag}): ... print('geometric albedo = {0:.4f}'.format(ceres.geomalb)) ... print('phase integral = {0:.4f}'.format(ceres.phaseint)) geometric albedo = 0.0878 phase integral = 0.3644
Initialize DiskIntegratedPhaseFunc
- Parameters:
- radiusastropy.units.Quantity, optional
Radius of object. Required if conversion between magnitude and reflectance is involved.
- wfb
Quantity
,SpectralElement
, string Wavelengths, frequencies, or bandpasses. Bandpasses may be a filter name (string). Required if conversion between magnitude and reflectance is involved.
- **kwargsoptional parameters accepted by
astropy.modeling.Model.__init__()
Attributes Summary
Names of the parameters that describe models of this type.
Methods Summary
evaluate
(pha, hh, gg)Evaluate the model on some input variables.
fit_deriv
(pha, hh, gg)Attributes Documentation
- G = Parameter('G', value=0.4, bounds=[-0.253, 1.194])¶
- H = Parameter('H', value=8.0)¶
- param_names = ('H', 'G')¶
Names of the parameters that describe models of this type.
The parameters in this tuple are in the same order they should be passed in when initializing a model of a specific type. Some types of models, such as polynomial models, have a different number of parameters depending on some other property of the model, such as the degree.
When defining a custom model class the value of this attribute is automatically set by the
Parameter
attributes defined in the class body.
Methods Documentation