NEW VARIABLE RADIO-SOURCE IN CYGNUS

Observations made at NRAO, Greenbank, at a wavelength of 3·7 em of a source in Cygnus revealed a flux variation from 2·2 to 6·3 Jy during I973· Although the field was very crowded because of the low galactic latitude, accurate radio and optical position measurements have yielded a provisional identification with a blue stellar object which had a magnitude of 19·5 on the Sky Survey. The identification is confirmed by recent optical observations showing that the object had brightened to I8·s by 1973 November. A spectroscopic examination has revealed an emission feature near 4300 A, and the object is almost certainly a quasar. © Royal Astronomical Society • Provided by the NASA Astrophysics Data System.