the Cerro Tololo Interamerican Observatory in Chile. The surface temperature of this substellar object was found to be a relatively cool 500 degrees Celsius, making it cooler and less luminous than any other known brown dwarf (including the prototype "T" dwarf), and classifying the object as a T7-8V brown dwarf. No X-rays have been reported from this brown dwarf. Claims of a planetary system In 1998, an extrasolar planet was announced to orbit the primary star within the Gliese 570 system. The planet, identified as "Gliese 570 Ab", was considered doubtful and the claim was retracted in 2000. No extrasolar planets have been confirmed to exist in this multiple star system thus far. See also Epsilon Indi Gliese 229 HD 188753 Iota Horologii Phi2 Pavonis Notes References External links Libra (constellation) K-type main-sequence stars M-type main-sequence stars T-type stars Triple star systems Librae, 33 0570 131976 5568 073182 4 Durchmusterung objects