sorcha_addons.activity.lsst_comet.model

Classes

Comet

LSST comet model.

Module Contents

class Comet(k=-2, afrho1=1500, **kwargs)

LSST comet model.

The goal of this model is to make a template comet based on H magnitude, which is the main brightness parameter in the LSST Metrics Analysis Framework. Using this value enables easy object cloning.

Parameters:

• afrho_q (afrho1 or) – Comet coma quantity Afρ at 1 au (afrho1) or at perihelion (afrho_q), in units of cm. The latter requires q.

• k (float) – Activity power-law slope with heliocentric distance: rh^k.

• q (float, required if afrho_q is provided) – Perihelion distance for Afρ normalization.

• Phi_c (function, optional) – One-parameter function that takes phase angle in degrees and returns the phase function for comae. It is assumed that Phi(0) = 1.0. Default is to use the Halley-Marcus phase function of Schleicher & Bair 2011.

mv_sun = -26.76

m_sun

k = -2

afrho1 = 1500

Phi_c

_get_value(d, keys, unit)

_normalize_geom(geom)

afrho(geom)

Afρ quanitity given geometrical circumstances.

Parameters:

geom (dictionary-like) – ‘rh’ or ‘helio_dist’, and ‘phase’ or ‘alpha’ angle in au and deg.

Returns:

afrho – Afρ parameter in cm.

Return type:

float

mag(geom, bandpass, rap=1)

Apparent magnitude within aperture.

Parameters:

• geom (dictionary-like) – ‘rh’ or ‘helio_dist’, ‘delta’ or ‘geo_dist’, and ‘phase’ angle in au and deg.

• bandpass (string) – LSST bandpass. One of u, g, r, i, z, y.

• rap (float, optional) – Aperture radius in arcsec.