Deborah Byrd's article Have you seen the Mayak satellite? explains Mayak with a bit of humor:
A team of young Russians – led by Moscow State Mechanical Engineering University (MAMI) – managed to raise more than $30,000 on Russian crowdfunding website Boomstarter, in order to launch their own small satellite. The satellite is called Mayak, which means beacon in English. It’s a cubesat, roughly the size of a loaf of bread. And it’s up there. Mayak went into space on July 14, 2017, as part of a secondary payload, launched on a Soyuz 2.1v vehicle from Baikonur Cosmodrome in Kazakhstan. It’ll be orbiting Earth, about 370 miles (600 km) high, for the coming month. It’s supposed to be very, very bright, so bright that it would, supposedly, ruin night skies and threaten astronomy. (emphasis added)
The article continues and it worth the read!
Mayak has been receiving roughly daily TLE updates, so it's definitely up there and being tracked. However, I do not know if the 3U cubesat has deployed it's giant metallized polymer film reflector yet.
Question: Have there been any reported sightings or photos of Mayak yet? Is it known if the reflector has even successfully deployed?
It's supposed to be as bright as -8 or -10 magnitude if the sun catches one of the faces of the 2 meter tetrahedral reflector.
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.
above: Mayak Reflector – Photo: CosmoMayak, From Spaceflight 101
above: Mayak Artists conception, From NASA Spaceflight