TESS Cameras and Sun Shade
The TESS instrument is comprised of four identical cameras. Each camera has seven lenses, a package of detectors and electronics to detect transits of exoplanets around distant stars. The cameras each have a lens hood to help prevent stray light from other sources from entering lenses and distorting the light from distant stars that TESS will focus on. The four cameras are placed on a camera plate. The camera plate is enclosed by a sun shade to further protect the cameras from stray light.
The spacecraft includes the structure and components to support the TESS science instrument. Within the spacecraft, batteries, propulsion (fuel and thrusters), reaction wheels computers for commanding the spacecraft and transmitting data all allow the TESS science instrument to complete the mission for finding new exoplanets.
The antennas on TESS allow for the transmission of commands to the spacecraft and instrument. Also, the antennas allow the TESS spacecraft to transmit data collected by the TESS instrument back to Earth for analysis. The large circular dish is the High Gain Antenna; the two smaller antennas are S-Band antennas.
TESS Solar Arrays
Spacecraft operating in the inner Solar System usually rely on the use of solar panels to derive electricity from sunlight. Solar panels on spacecraft supply power for the instrument and spacecraft systems. Solar panels need to have a lot of surface area that can be pointed towards the Sun as the spacecraft moves. More exposed surface area means more electricity can be converted from light energy from the Sun.