he Orgov Radio-Optical Telescope, also known as ROT54 or the Herouni Mirror Radio Telescope, is a radio telescope in Orgov, Armenia. It was built between 1975 and 1985 and was active between 1986 and 1990 before its use was halted. It was again operational until ceasing in 2012. Subsequently, many attempts have been made to restore and restart the ROT54.

Byurakan Astrophysical Observatory (BAO) was founded in 1946 on the initiative of academician Victor Ambartsumian, who became the first director of the observatory. It is located on the picturesque southern slope of the mountain Aragats. At the observatory there are 12 observational instruments installed, the larger ones being 2.6 m Cassegrain telescope and 1m Schmidt telescope. Scientific researches of the observatory are related mainly with the instability phenomena taking place in the Universe.