There is a modest positive correlation between albedo and slope parameter
G. Low albedo asteroids tend to have low values of G, corresponding to
steeper sloping phase relation. Higher albedo objects tend to have
shallower slope phase curves and corresponding higher value of G. Except
in extreme cases though, determining G is not a reliable substitute for
measuring albedo. A very flat phase relation (G > 0.3 or so) is indicative
of a high albedo, but can't be used for a quantitative estimate. Likewise
G < 0.1 generally indicates a low albedo, but again, isn't a quantitative
measure. Phase curves of very irregular objects (high amplitude
lightcurves) are even more difficult to interpret.

Regards,

Alan

At 11:01 AM 7/10/2009, Dimitry Chestnov wrote:
>Hi all,
>
>What is physical meaning of magnitude slope (G) in asteroid light curves?
>Is magnitude slope related to albedo? What is relation between albedo and G?
>
>Regards,
>Dimitry
>
>
>
>
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Alan W. Harris
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Space Science Institute
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