The July 14, 2017 NASA Spaceflight article Soyuz 2-1A launches with Kanopus-V-IK and over 70 satellites says:
Mayak is a three-unit CubeSat which was built by Tvoii Sektor Kosmosa – or “Your Sector of Space” – an independent, crowd-funded team of engineers in conjunction with the Moscow State University of Mechanical Engineering. Mayak – meaning Lighthouse – will deploy a highly reflective tetrahedral structure.
Each side of this structure has an area of four square meters, or 43 square feet. To ground observers, the satellite is expected to have an apparent magnitude of up to -10, making it one of the brightest objects in the night sky. The structure will double as a deorbit mechanism, hastening the decay of the satellite’s orbit.
Right now the orbit of the primary payload Kanopus-V-IK
2017-042A, 42825 should be a good guess for the rough predictor of Mayak passes, but once it deploys that giant reflector, things should change quickly.
How is this large reflector made from thin polymer film carefully expanded to and maintained in its full size and shape so that its faces are at least somewhat flat?
below: Screen shot from the YouTube video Mayak. No more space debris!
below: Mayak Reflector – Photo: CosmoMayak, From Spaceflight 101
below: Mayak Artists conception, From NASA Spaceflight