AKA: Poisk. Status: Operational 2001. First Launch: 2001-09-14. Last Launch: 2009-11-10. Number: 2 . Payload: 3,900 kg (8,500 lb). Gross mass: 7,250 kg (15,980 lb). Height: 6.40 m (20.90 ft). Diameter: 2.60 m (8.50 ft).
The Russian docking and airlock module for the International Space Station. The Stikovochniy Otsek No. 1 (SO1, Docking Module 1), article 240GK No. 1L, was built by Energia and derived from Soyuz hardware. It had a mass of around 3900 kg and was a 4.1 m long, 2.6 m diameter ovoid. The SO1 was named Pirs (Russian for "pier") and was delivered to the station by Progress M-SO1 in a completely automatic rendezvous and docking operation. Pirs provided extra clearance from the Station for ships docking underneath Zvezda, and was used as an airlock for spacewalks using the Russian Orlan EVA suits.
Credit: Manufacturer Image
Progress M-SO1 was the designation given to the service module section of a Progress M; the 3900 kg Pirs docking and airlock module for the ISS replaced the standard cargo and fuel sections. It also carried an astronaut chair, a space suit, a small crane, and some equipment for the Zvezda module of the ISS. Progress-M No. 301 was launched into an initial 180 km circular orbit. By September 16 it had maneuvered into a 238 x 264 km orbit; by 0038 GMT on September 17, a 385 x 395 km x 51.6 deg orbit upon rendezvous with the ISS. The Progress began a fly around of the station and lined up with the nadir port on Zvezda. Docking of Pirs with Zvezda came at 0105 GMT on September 17. The Progress M-SO1 later undocked from the Pirs nadir port to leave it free for future dockings. Pirs gave extra clearance from the Station for ships docking underneath Zvezda, and was also used as an airlock for spacewalks using the Russian Orlan EVA suits. Progress M-SO1 service module undocked from the Pirs module at 1536 GMT on September 26 and was deorbited over the Pacific at 2330 GMT the same day.
Docking/research module for the ISS, consisting of a pressurized Small Research Module and a Progress M service module. Docked at the zenith port of the Zvezda module of the ISS at 15:41 GMT on 12 November. On 8 December at 00:16 GMT the service module separated from Small Research Module, leaving the docking port clear for future spacecraft visiting the ISS. At 04:48 GMT the service module retrofired into a descructive reentry over the Pacific at 05:27 GMT.