What is the brightest star in the constellation Cygnus?
Cygnus (constellation) Cygni was then considered to be the body of Christ. Bayer catalogued many stars in the constellation, giving them the Bayer designations from Alpha to Omega and then using lowercase Roman letters to g. John Flamsteed added the Roman letters h, i, k, l and m (these stars were considered "informes" by Bayer as they lay outside the asterism of Cygnus), but were dropped by Francis Baily. There are several bright stars in Cygnus. Alpha Cygni, called Deneb, is the brightest star in Cygnus. It is a white supergiant star of spectral type A2Iae that varies between magnitudes 1.21 and
Cygnus (constellation) companions. Another black hole in Cygnus is V404 Cygni, which consists of a K-type star orbiting around a black hole of around 12 solar masses. The black hole, similar to that of Cygnus X-3, has been hypothesized to be a quark star. 4U 2129+ 47 is another X-ray binary containing a neutron star which undergoes outbursts, as is EXO 2030+ 375. Cygnus is also home to several variable stars. SS Cygni is a dwarf nova which undergoes outbursts every 7–8 days. The system's total magnitude varies from 12th magnitude at its dimmest to 8th magnitude at its brightest. The two