The Temisat micro-satellite was a piggyback payload designed to collect and re-transmit environmental data from terrestrial sensors and was separated from Meteor-2-21 on the seventh transit of the flight. Temisat was registered by the Telespazio Italian partner in agreement with the Kaiser-Threde Company (Munich). Environmental measurements were acquired through ground sensors, collected, temporarily stored on the ground, and logged by an autonomous terminal until upload request is received from TEMISAT.Characteristics: (a) Mass 42 kg (b) Dimension 35 x 35 x 35 cm, (c) Electric power 62 W Max, (d) Attitude control : 2 magnetic coil, 1 Am**2, (e) On-board memories - 2 of 8.5 Mbytes each, (f) Lifetime 5 years. Drift of the ascending node of orbital plane: 0.8 deg/d westwards. Copassenger of METEOR 2 satellite.