phase_HalleyMarcus¶

sbpy.activity.dust.
phase_HalleyMarcus
(phase)[source]¶ HalleyMarcus composite dust phase function.
Uses
interpolate
for spline interpolation, otherwise uses linear interpolation frominterp
. Parameters
 phase
Quantity
,Angle
Phase angle.
 phase
 Returns
 Phifloat,
ndarray
 Phifloat,
Notes
The HalleyMarcus phase function was first used by Schleicher and Bair (2011), but only described in detail by Schleicher and Marcus (May 2010) online at:
http://asteroid.lowell.edu/comet/dustphase.html
“To distinguish this curve from others, we designate this as the HM phase function, for the sources of the two components: Halley and Marcus, where the Halley curve for smaller phase angles comes from our previous work (Schleicher et al. 1998) while Joe Marcus has fit a HenyeyGreenstein function to a variety of mid and largephase angle data sets (Marcus 2007); see here for details. Note that we do not consider our composite curve to be a definitive result, but rather appropriate for performing firstorder adjustments to dust measurements for changing phase angle.”
References
Schleicher & Bair 2011, AJ 141, 177. Schleicher, Millis, & Birch 1998, Icarus 132, 397417. Marcus 2007, International Comets Quarterly 29, 3966.
Examples
>>> from sbpy.activity import phase_HalleyMarcus >>> import astropy.units as u >>> phase_HalleyMarcus(0 * u.deg) # doctest: +FLOAT_CMP 1.0 >>> phase_HalleyMarcus(15 * u.deg) # doctest: +FLOAT_CMP 5.8720e01