At 23:26 JST July 26, we started the operation of an adiabatic demagnetization refrigerator (ADR) of the X-ray spectrometer experiment (XRS). And at around 1:10JST July 27 when Suzaku came back over Uchinoura Space Center, we confirmed that the XRS was cooled down to 60 milli-degrees Kelvin (60mK) or -273.09 degrees centigrade. This is the lowest temperature   artifically achieved in space so far. We also confirmed that the XRS is operating properly.