PROGRESS-M 40 (Progress M-40) is a cargo satellite launched on October 25, 1998, from Tyuratam Site LC1 using the Soyuz-U-PVB launch vehicle. It was manufactured by PROGT and operated by RKKE for Russia (RU). The spacecraft measures 7.9 meters in length with a diameter of 2.7 meters and a span of 7.9 meters. Its dry mass is 4500 kg, while its launch mass was 7200 kg. Equipped with two deployable fixed solar arrays and batteries for power, the satellite has a shape described as Sphere + Cone + Cyl + 2 Pan, with an RCS of 17.41. Its mission was to deliver cargo using the Progress 7K-TGM No. 239 payload system.