Research of physical parameters of near-Earth asteroids by photometry and polarimetry

par Dr Yurij Krugly (Institute of Astronomy of V.N. Karazin Kharkiv National University (Ukraine))

mardi 26 nov. 2024, 14:00 → 15:00 Europe/Paris

Denisse (Observatoire de Paris)

The ground-based optical observations of near-Earth asteroids (NEAs) remain the primary tool for accumulating data on their physical properties. Since 1995, regular photometric observations of NEAs at Kharkiv and Simeiz Observatories were carried out using 70-cm and 1-m telescopes respectively, while it was stopped on February 22, 2022. At present, the observations continue in cooperation with colleagues at telescopes/observatories: 0.7-m telescope at Abastumani (Georgia), 0.6 and 2-m at Rozhen Observatory (Bulgaria), 0.6 and 1.5-m at Maidanak (Uzbekistan), 1-m at Tien-Shan (Kazakhstan), and 0.4 and 0.8-m at CTIO (Chile, USA).

The observations are aimed at determining the absolute magnitudes, rotation periods, colour indices, albedos, taxonomic types, sizes and shapes of the NEAs, and finding and investigating binary systems between them. The main objects are: newly discovered NEAs during its close approach to the Earth; potentially hazardous asteroids (PHA); asteroids for which the YORP effect is expected to be detected, the well-known binary NEAs to investigate the BYORP effect; asteroids that are objects of research by radar or/and a space mission. The obtained results will be presented.