Mozhayets 1, 2, 3, 4 (RS 16, 20, 22, Zeya)

Mozhayets 2 (Zeya, RS 16)

Mozhayets 3 (RS 20) [SSTL]

Mozhayets is a series of educational satellites developed at the Mozhaisky military academy. Mozhayets 1 to 4 are based on Strela-1M satellite busses, which were left over from the Strela-1M communication satellite program.

Mozhayets 1 was an engineering model developed in 1995, but never launched.

The Mozhayets 2 (Zeya, RS 16) satellite is a Russian Military Communications satellite launched on March 4, 1997. Zeya is named after the Zeya River, which is very close to it's launch site, Cosmodrome Svobodniy. This was the first satellite launched from this new Russian launch site in far eastern Russia.

Zeya has the following instrumentation onboard:

• Radio equipment
• GPS receiver
• GLONASS receiver
• Laser retroreflector array

The retro-reflector array is a box array of 20 corner cubes, which are optimized at 532 nanometers. Twenty retroreflectors operating with principle "not more than one reflectors works in any direction" are installed on the satellite. Each retroreflector has field of view of 35 arc degrees. Retroreflectors ensure reflection of laser light within 47% of 4 steradian. Satellite's design provides accuracy of link of range measurements to the center of mass with root mean square error of about 5 mm. Systematic correction is 419 mm. The satellite is spinning around Y axis with angular velocity about 30 revolutions per minute.

Mozhaets 3 (RS 20) is a navigational and scientific satellite, which was originaly built as a Strela-1M satellite. After having been used for many years as an educational display at the Mozhaisky military academy, students of the academy fitted completely new avionics and payload to the satellite bus. One of its experimental payloads is an Amateur Radio telemetry beacon (RS-20). RS-20 is transmitting CW telemetry on 145.818 and 435.319 MHz

Mozhayets 4 (RS 22) is also a training satellite built by the Mozhaisky military academy. It also tests components to be used in upgraded GLONASS satellites.