Study of photometric phase curve with new brightness model: Refining phase function system parameters of asteroid (107) Camilla.

We characterize the morphology of the photometric phase curve model of an asteroid with a three-parameter magnitude phase function H − G 1 − G 2 system by considering the effect of brightness variation arising from a triaxial ellipsoid representing the asteroid’s shape. Applying this new model and a Markov Chain Monte Carlo method, we refine the photometric phase curve of asteroid (107) Camilla and obtain its absolute magnitude H = 7.026 +0.052 −0.054 mag, and phase function parameters G 1 = 0.489 +0.043 −0.044 and G 2 = 0.259 +0.023 −0.023 . Meanwhile, we also determine (107) Camilla’s orientation of pole ( , ) with rotational period of 4.843928 +0.000001 −0.000001 h, and axial ratios a/b = 1.409 +0.020 −0.020 and b/c = 1.249 +0.063 −0.060 . Furthermore, according to the values of phase function parameters G 1 and G 2 , we infer that asteroid (107) Camilla is an X-type asteroid.