The SOYUZ-T 15 ORBIT MODULE (also known as Soyuz T-15 BO) is a spacecraft with a NORAD catalog ID of 16863 and an object identifier of 1986-022C. Launched on March 13, 1986, from the Tyuratam Space Center's Launch Complex 1 using a Soyuz-U2 launch vehicle, this module is part of the Soyuz BO bus type and was manufactured by NPOE (NPO Energia). The module has dimensions of 6.5 meters in length, 2.4 meters in diameter, and spans 6.5 meters. It has a dry mass of 1250 kg, which is identical to its launch mass. The structure consists of a spherical section combined with a DCone shape, with an RCS (Reaction Control System) area of 12.63 square meters. The purpose of the payload, known as "Bitovoy otsek," remains unspecified in the provided data.