Planetary Group Seminar: Absolute colors and phase coefficients of trans-Neptunian objects (M. del Loera)
11:00 - 12:00
Ma del Carmen Ayala Loera
Observatório Nacional MCTIC, Rua General José Cristino 77, Rio de Janeiro, RJ, 20921-400, Brazil
The trans-Neptunian objects (TNOs) are small bodies at large distances from the Sun. As such, their physical properties are difficult to measure. Accurate determination of their physical parameters is essential to model and theorize the actual composition and distribution of the population, and to improve our understanding of the formation and evolution of the Solar System. Our objective is to construct phase curves in two filters, V and R, of a large TNO sample obtaining absolute magnitudes (H) and phase coefficients (β), and study possible relations between them and other physical parameters (orbital elements, sizes, and albedos). We used our own data, together with data from the literature, to create the phase curves assuming an overall linear trend. We obtained observations for 35 TNOs, 27 in filter V and 35 in filter R, which toghether with literature’s data allow us to obtain absolutes magnitudes, 114 in V filter and 113 in filter R. From the latest, we have phase curves in both filters for 106 objects. From the search for correlations we found a strong anticorrelation between H V − H R and ∆ β = β V − β R , which is probably related to surface structure and composition of the objects.