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Sigma Sagittarii (σ Sgr) ("Nunki") is the constellation's second-brightest star at magnitude 2.08. Nunki is a B2V star approximately 260 light-years away. [6] "Nunki" is a Babylonian name of uncertain origin, but thought to represent the sacred Babylonian city of Eridu on the Euphrates, which would make Nunki the oldest star name currently in ...
In traditional astrological nomenclature, the stars were divided into fixed stars, Latin stellæ fixæ, which in astrology means the stars and other galactic or intergalactic bodies as recognized by astronomy; and "wandering stars" (Greek: πλανήτης αστήρ, planētēs astēr), which we know as the planets of the Solar System.
Orion's seven brightest stars form a distinctive hourglass-shaped asterism, or pattern, in the night sky. Four stars—Rigel, Betelgeuse, Bellatrix, and Saiph—form a large roughly rectangular shape, at the center of which lies the three stars of Orion's Belt—Alnitak, Alnilam, and Mintaka. His head is marked by an additional 8th star called ...
The star Chi Virginis has one of the most massive planets ever detected, with a mass of 11.1 times that of Jupiter. The sun-like star 61 Virginis has three known planets: one is a super-Earth and two are Neptune-mass planets. SS Virginis is a variable star with a noticeable red color. It varies in magnitude from a minimum of 9.6 to a maximum of ...
The carbon star CW Leo is the brightest star in the night sky at the infrared N-band (10 μm wavelength). The star SDSS J102915+172927 (Caffau's star) is a population II star in the galactic halo seen in Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy. It has the lowest metallicity of any known star.
However, many more stars are visible with even a modest telescope. [21] Astronomers estimate that the cluster has approximately 500–1,000 stars, all of which are around 100 million years old. However, they vary considerably in type. The Pleiades themselves are represented by large, bright stars; also many small brown dwarfs and white dwarfs exist
Alpha Librae, called Zubenelgenubi, is a multiple star system divisible into two stars when seen through binoculars, The primary (Alpha 2 Librae) is a blue-white star of magnitude 2.7 and the secondary (Alpha 1 Librae) is a white star of magnitude 5.2 and spectral type F3V that is 74.9 ± 0.7 light-years from Earth. Its traditional name means ...
IK Pegasi is a close binary comprising an A-type main-sequence star [42] and white dwarf [43] in very close orbit; the latter a candidate for a future type Ia supernova [44] as its main star runs out of core hydrogen fuel and expands into a giant and transfers material to the smaller star. Twelve star systems have been found to have exoplanets.