HG12_Pen16¶
- class sbpy.photometry.HG12_Pen16(*args, **kwargs)[source]¶
Bases:
HG12
Revised H, G12 model by Penttil”a et al. (2016)
This system is the revised H, G12 system by Penttil”a et al. (2016, Planet. Space Sci. 123, 117-125) that has a continuous derivative with respect to parameter G12. The original model as adopted by IAU as the “standard” model for disk-integrated phase functions of planetary objects is implemented in class
HG12
.Examples
>>> # Define the phase function for Themis with >>> # H = 7.121, G12 = 0.68 >>> >>> import astropy.units as u >>> from sbpy.calib import solar_fluxd >>> from sbpy.photometry import HG12_Pen16 >>> themis = HG12_Pen16(7.121 * u.mag, 0.68, radius = 100 * u.km, ... wfb = 'V') >>> with solar_fluxd.set({'V': -26.77 * u.mag}): ... print('geometric albedo = {0:.4f}'.format(themis.geomalb)) ... print('phase integral = {0:.4f}'.format(themis.phaseint)) geometric albedo = 0.0622 phase integral = 0.3804
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
(ph, h, g12)Evaluate the model on some input variables.
fit_deriv
(ph, h, g12)Attributes Documentation
- G12 = Parameter('G12', value=0.3, bounds=[0, 1])¶
- param_names = ('H', 'G12')¶
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