International Space Station
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This is the International Space Station (ISS). The ISS consists of pressurized modules, structural truss elements, radiators, solar arrays, additional systems, and scientific experiments. The ISS Solar Array Wings (SAWs) are mounted on the outboard section of the truss, which is the backbone of the ISS. The outboard truss sections on both sides of the ISS and each individual SAW rotate 360 degrees in order to stay in optimal alignment with the sun. The large white paneled objects on the outboard truss and and the inboard truss segments are radiators that help maintain ideal temperature for the ISS external and internal systems, as well as for the crew modules. The radiators on the inboard truss segments are capable of rotation as well, although they typically are commanded to remain in a set position and do not rotate much.
The Heat Rejection Subsystem (HRS) Radiators (HRSR), shown in red, are attached to the inboard truss. These radiators are mounted in groups of three to the radiator beam which rotates +/- 160 degrees about a rotation point called the Thermal Radiator Rotary Joint (TRRJ). These joints are referred to in the project as STRRJ and PTRRJ for the Starboard TRRJ and Port TRRJ, respectively. The HRS radiators are typically locked at -40 degrees (PTRRJ) and 25 degrees (STRRJ) although they can also auto track. The angle conventions are shown here.
The outboard truss, shown in blue, is the part of the ISS truss structure that houses the Solar Arrays, Photo-voltaic Radiators, and electrical conditioning/storage equipment for the ISS electrical system. The outboard truss consists of three different truss segments attached to each other: P4 + P5 + P6 (for the port side, S4 + S5 + S6 for starboard). The outboard truss rotates 360 degrees every orbit to provide the Solar Arrays with the best angle to capture solar energy. The outboard truss is attached to the inboard truss at the P3/P4 (or S3/S4) Solar Alpha Rotary Joint (SARJ), called the Port SARJ (PSARJ) and Starboard SARJ (SSARJ) in the project.
The Photovoltaic (PV) Radiators (PVR), shown in green, are rigidly fixed to the outboard truss. These radiators rotate along with the outboard truss but do not individually rotate like the HRSRs.
The ISS has eight Solar Array Wings (SAWs), shown in yellow, which generate electrical power for the station. Each SAW individually rotates about an attachment point on the outboard truss, known as a Beta Gimbal Assembly (BGA). The BGAs are identified by the name of their associated power channel.
