First two manoeuvres of Progress were done successfully. Preliminary time of the 3rd one is 09:50:36 UTC on Dec 21, orbit #17, dV=2.0 m/s, pitch=yaw=0 deg. Current EFG vector of Progress is (after orbit determination based on measurements carried out on 4th and 5th orbits): Orbit # 4 Date 1997/12/20 Time, UTC 12:59:49.170 X, km 3841.13905 Y, km -5470.27811 Z, km 0.00000001 Vx, km/s 3.49593220 Vy, km/s 2.50045961 Vz, km/s 6.05436937 Nodal period, min 90.2721 Inclination, deg 51.6771 Hmin, km 264.0743 Hmax, km 336.8896 Long. of AscNode, deg 305.0759 E RAAN 1950.0, deg 229.4457 Semimaj. axis, km 6675.59 Eccentr. 0.00501 Arg. of perig., deg 105.17 Best regards, Vladimir Agapov. -- Vladimir M. Agapov | Ballistic Center of Moscow, Russia | the Keldysh Institute of Applied Mathematics RAN | Moscow, Russia e-mail: avm@kiam1.rssi.ru | tel +7-095-333-8067 (work), fax +7-095-333-6334