1. Observatório Nacional, R. Gen. José Cristino, 77 - São Cristóvão, 20921-400 Rio de Janeiro, RJ, Brazil
2. Blue Mountains Observatory, 94 Rawson Pde. 2780 Leura, New South Wales 2780, Australia
3. CONACYT – Instituto de Astronomía, Universidad Nacional Autónoma de México (IA-UNAM), AP 106, Ensenada 22800, BC, Mexico
4. Division of Space Mechanics and Control, INPE, C.P, 515, São José dos Campos, 12227-310 São Paulo, SP, Brazil