Speaker
Description
The NEOCC Aegis Orbit Determination and Impact Monitoring system currently uses the H-G model by Bowell et al. 1989 to determine the absolute magnitude H from photometry data. Typically, it is not possible to determine both the absolute magnitude H and the slope parameter G, therefore G is often fixed to a nominal value of 0.15. However, several studies have shown that the slope parameter may vary widely depending on the composition of the asteroid, and the value 0.15 may not be an accurate guess for the whole NEA population. In this talk, we present a new statistical approach to determine H, based on a population model of the slope parameter G. This also permits an extrapolation of uncertainties in the determination of H. Some preliminary results are shown, and a discussion on possible improvements will be raised.
