Ultraviolet telescope Procyon was on board Kosmos 309 in 1969, and X-ray telescope Altair on board Meteor 1-16 in 1974; both were launched from Plesetsk cosmodrome. The highlight was Orion 2 Space Observatory (see Orion 1 and Orion 2 Space Observatories), with a wide-angle meniscus telescope of the Cassegrain system, operated on board the spacecraft Soyuz 13 in December 1973. Spectra of thousands of stars to as faint as 13th magnitude were obtained, the first satellite UV spectrogram of a planetary nebula (IC 2149) was obtained, revealing lines of aluminum and titanium - elements not previously observed in planetary nebulae, two photon emission from nebulae was detected for the first time.