Theta Cygni [SEP] constellation
Theta Cygni
Theta Cygni (θ Cygni, θ Cyg) is a star in the northern constellation of Cygnus. It has an apparent visual magnitude of 4.5, so it can be seen from the northern hemisphere with the naked eye in sufficiently dark skies. Based upon parallax measurements, it is at a distance of about from the Earth. It is suspected of hosting an extrasolar planet.
Properties.
The spectrum of the primary star matches a stellar classification of F3 V. The luminosity class 'V' is associated
a third iteration, where numeric superscripts were added to distinguish those previously unresolved stars. Examples include Theta Sagittarii ("θ Sgr") later distinguished as Theta¹ Sagittarii ("θ¹ Sgr") and Theta² Sagittarii ("θ² Sgr"), each being their own (physical) star system with two and three stars, respectively.
Stars Catalogues Flamsteed designation.
Flamsteed designations consist of a number and the Latin genitive of the constellation the star lies in. Examples include 51 Pegasi and 61 Cygni. About 2,500 stars are catalogued