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Vega is a main sequence A-type star located in the constellation Lyra approximately 25 light-years from Earth. It’s notable for its bright blue-white color and historical significance as the northern pole star. Vega plays a key role in the Summer Triangle asterism and contains a surrounding debris d...
Sirius is the most luminous star visible from Earth. It’s a binary star system consisting of a brilliant white A-type main sequence star and a smaller companion. Located in the constellation Canis Major, Sirius has been observed for millennia, serving as a key navigational reference point for sailor...
Altair is a brilliant A-type main-sequence star located within the constellation Aquila. Situated just 17 light-years from Earth, it’s notable for its exceptionally fast rotation rate. This rapid spin causes a flattening of the star at its poles. Altair represents a key nearby star system and is par...
RR Lyrae is a variable star in the constellation Lyra and the prototype of the RR Lyrae class of pulsating variable stars. These stars regularly expand and contract in size and brightness over periods typically lasting less than a day. Because their intrinsic luminosity is predictable, astronomers u...
HR 8799 is a young A-type main-sequence star located approximately 129 light-years away in the constellation of Pegasus. In 2008, it achieved major astronomical significance when it became the first star system with multiple exoplanets to be directly imaged. High-resolution observations revealed fou...
Beta Pictoris is a young, A-type main-sequence star located approximately 63 light-years from Earth in the constellation Pictor. It was the first star to be imaged with a surrounding circumstellar debris disk, a finding confirmed in 1984. The system is of significant interest to astronomers because...
Fomalhaut is a bright, A-type main-sequence star located about 25 light-years away in the constellation Piscis Austrinus. It is surrounded by a complex and prominent circumstellar debris disk, which was first imaged by the Hubble Space Telescope. The system is notable for hosting Fomalhaut b, an obj...
Castor, designated Alpha Geminorum, is the second-brightest star system in the constellation of Gemini, located approximately 51 light-years from Earth. Despite its Bayer designation implying it is the brightest, it is fainter than its neighbor Pollux. Astronomically, Castor is a complex system comp...
Merak, designated Beta Ursae Majoris, is a white main-sequence star of spectral type A1IV–V located approximately 79 light-years from the Sun in the constellation Ursa Major. It is one of the seven stars that form the Big Dipper asterism and, together with Dubhe (Alpha Ursae Majoris), serves as one...
Alioth, designated Epsilon Ursae Majoris, is the brightest star in the constellation Ursa Major and the brightest of the seven stars comprising the Big Dipper asterism. It is an A-type star located approximately 83 light-years from the Sun and is classified as a chemically peculiar star, exhibiting...
Thuban, designated Alpha Draconis, is a star in the constellation Draco that served as Earth's north pole star during much of the third millennium BCE. The shift occurred because of axial precession, the slow 26,000-year wobble of Earth's rotational axis, which gradually changes the position of the...
Delta Scuti is an A-type subgiant star located in the constellation Scutum that serves as the prototype for a class of short-period pulsating variable stars. These variables undergo slight, rapid fluctuations in luminosity over periods ranging from a few minutes to a few hours due to radial and non-...
KELT-9 is a hot, rapidly rotating A-type main-sequence star located roughly 670 light-years away in the constellation Cygnus. It is highly notable for hosting KELT-9b, an ultra-hot Jupiter exoplanet that was the hottest known exoplanet at the time of its discovery. The planet's extreme dayside tempe...
Alcor is a white main sequence star of spectral type A5V located approximately 81 light-years from Earth in the constellation Ursa Major. With an apparent visual magnitude near 4.0, it forms a close naked-eye visual pair with Mizar in the handle of the Big Dipper. The two stars were historically use...
Miaplacidus, designated Beta Carinae, is an A-type subgiant or giant star located approximately 113 light-years away in the southern constellation of Carina. It ranks as the second-brightest star in the constellation and is one of the 57 fundamental stars used for celestial navigation. The star's un...
Megrez, designated Delta Ursae Majoris, is an A-type main-sequence star approximately 81 light-years from Earth. With an apparent magnitude of 3.3, it is the faintest of the seven stars that form the Big Dipper asterism in the constellation Ursa Major. Megrez marks the junction point where the handl...
Rasalhague, designated Alpha Ophiuchi, is the brightest star in the constellation Ophiuchus with an apparent magnitude of approximately 2.1. It is a binary star system located about 47 light-years from Earth, consisting of an A-type giant primary star and a smaller companion. The name Rasalhague der...
Denebola, designated Beta Leonis, is the second-brightest star in the constellation Leo. Located approximately 36 light-years from Earth, it is an A-type main-sequence star that marks the tail of the celestial lion. Denebola is a confirmed member of the Ursa Major Moving Group, an association of sta...
SX Phoenicis is a variable star located in the constellation Phoenix and serves as the prototype for the class of SX Phoenicis variables. These stars are Population II pulsating variables that share characteristics with Delta Scuti variables but are typically older and metal-poor. SX Phoenicis itsel...
Alhena, designated Gamma Geminorum, is a white giant star located approximately 109 light-years from Earth in the zodiacal constellation of Gemini. As the third-brightest star in the constellation, it is readily visible to the naked eye under dark sky conditions. Historically, its predictable heliac...
Alphecca, formally Alpha Coronae Borealis, is the brightest star in Corona Borealis, the Northern Crown, and lies about 75 light-years from the Sun. It is an eclipsing spectroscopic binary whose two stars orbit closely enough that the system periodically changes brightness when one component passes...
Iota Ursae Majoris, formally named Talitha, is a quadruple star system located approximately 48 light-years from Earth in the northern constellation of Ursa Major. The primary component is an A-type main-sequence star with an apparent magnitude bright enough to be visible to the naked eye. Talitha f...
Delta Leonis, designated by the traditional name Zosma, is an A-type subgiant star located approximately 58 light-years away in the constellation of Leo. It has an apparent magnitude of about 2.56, making it easily visible to the naked eye and a prominent feature of the lion's back or hip region. Th...
Zubenelgenubi, officially designated Alpha Librae, is a wide binary star system located in the zodiac constellation of Libra. The primary star is a blue-white main-sequence star, while its companion is a fainter star visible under clear night skies. The system's traditional name is derived from an A...
Aspidiske, formally designated Iota Carinae, is a stellar body located in the southern constellation of Carina. It is a bright giant or supergiant star that exhibits a yellow-white hue and forms one of the four points of the False Cross asterism. The star's name, officially approved by the Internati...
Sabik, formally designated Eta Ophiuchi, is a binary star system and the second-brightest star in the constellation Ophiuchus. The system is located approximately 88 light-years from Earth and consists of two white A-type main-sequence stars. These two stars orbit each other with an estimated period...
Algorab, designated Delta Corvi, is a white main-sequence star located approximately 87 light-years from Earth in the constellation Corvus. It is the third-brightest star in Corvus and is recognized as a binary star system, having a fainter companion star. The name Algorab is derived from Arabic and...
Ascella, designated Zeta Sagittarii, is a binary star system located in the constellation Sagittarius. It is one of the brighter members of the prominent Teapot asterism, marking the lower southern edge of the formation. The system's primary star is a white main-sequence star, accompanied by a faint...
Meridiana is the official proper name approved by the International Astronomical Union for Alpha Coronae Australis, the brightest star in the southern constellation Corona Australis. Located roughly 130 light-years from Earth, it is a white A-type star and part of a binary system. The name distingui...
Alphekka Meridiana is a traditional name for Alpha Coronae Australis, the brightest star in Corona Australis, the Southern Crown. The star is a white A-type object in a binary system located roughly 130 light-years from Earth. The International Astronomical Union has approved the shorter proper name...
