1 South African Astronomical Observatory (SAAO), PO Box 9, Observatory 7935, Cape Town, South Africa.
2 University of Cape Town, Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, Private Bag X3, 7701, Rondebosch, Cape Town, South Africa.
3 Centro Brasileiro de Pesquisas Físicas, MCTI, Rua Dr. Xavier Sigaud, 150, Urca, 22290-180 Rio de Janeiro, RJ, Brazil.