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Detail of Bayer's chart for Orion showing the belt stars and Orion Nebula region, with both Greek and Latin letter labels visible. A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name.
The star is circumpolar throughout all of Europe, northern Asia, Canada, and American cities as far south as San Diego. Since Alpha Cephei has an apparent magnitude of about 2.5, the star is the brightest in the constellation and is easily observable to the naked eye, even in light-polluted cities.
Only a tiny minority of known stars have proper names; all others have only designations from various catalogues or lists, or no identifier at all. Hipparchus in the 2nd century BC enumerated about 850 naked-eye stars. Johann Bayer in 1603 listed about twice this number. Only in the 19th century did star catalogues list the naked-eye stars ...
Sigma Sagittarii has a spectrum matching a stellar classification of B2.5 V, [4] which indicates this is a B-type main-sequence star.Its total luminosity is 3,300 [16] times that of the Sun while it has a surface temperature of 18,890 K. [9] X-ray emission has been detected from this star, which has an estimated X-ray luminosity of 1.2 × 10 28 erg s −1.
Procyon's closest neighboring star is Luyten's Star, about 1.12 light-years (0.34 parsecs) away. [52] Procyon would be the brightest star in the night sky of an exoplanet orbiting Luyten's Star, with an apparent magnitude of -4.68. [a] Luyten's Star would also be visible from Procyon, at an apparent magnitude of 4.61, unlike any red dwarfs from ...
Albireo is the star in the head of the constellation of Cygnus (bottom). β Cygni (Latinised to Beta Cygni) is the system's Bayer designation. The brighter of the two components is designated β¹ Cygni or Beta Cygni A and the fainter β² Cygni or Beta Cygni B. The origin of the star system's traditional name Albireo is unclear.
Lambda Scorpii is a triple star system and the second-brightest object in the constellation of Scorpius.It is formally named Shaula; Lambda Scorpii is its Bayer designation, which is Latinised from λ Scorpii and abbreviated Lambda Sco or λ Sco.