|
50 Librae ...
This is the list of notable stars in the constellation Libra, sorted by decreasing brightness. See also *List of stars by constellation Color=Blue References * * * * * {{DEFAULTSORT:List of stars in Libra *List Libra Libra generally refers to: * Libra (constellation), a constellation * Libra (astrology), an astrological sign based on the star constellation Libra may also refer to: Arts and entertainment * ''Libra'' (novel), a 1988 novel by Don DeLillo Musi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star
A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sky, night, but their immense distances from Earth make them appear as fixed stars, fixed points of light. The most prominent stars have been categorised into constellations and asterism (astronomy), asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye, all within the Milky Way galaxy. A star's life star formation, begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Its stellar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zubeneschamali
Beta Librae (β Librae, abbreviated Beta Lib, β Lib), formally named Zubeneschamali , is (despite its 'beta' designation) the brightest star in the zodiac constellation of Libra. From parallax measurements, its distance can be estimated as from the Sun. The apparent visual magnitude of this star is 2.6. According to Eratosthenes, Beta Librae was observed to be brighter than Antares. Ptolemy, 350 years later, said it was as bright as Antares. The discrepancy may be due to Antares becoming brighter, but this is not known for certain. It could simply be caused by Beta Librae being a variable star, showing a present-day variability of 0.03 of a magnitude. Name ''β Librae'' ( Latinised to ''Beta Librae'') is the star's Bayer designation. It bore the traditional name ''Zubeneschamali'' (less common renderings, or corruptions, are ''Zuben Eschamali'', ''Zuben el Chamali'', ''Zubenesch'', ''Zubenelg''), derived from the Arabic الزُّبَانَى الشَمَالِي (''a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iota1 Librae
Iota1 Librae, Latinisation of names, Latinized from ι1 Librae, is a quadruple star system in the constellation Libra (constellation), Libra. Its apparent magnitude is 4.54. It is located 379 light years from earth. Visibility Due to its southern location, although the star can be seen from most regions of the earth, observers in the southern hemisphere are more advantaged. Near Antarctica, it appears Circumpolar star, circumpolar, while it always remains invisible only in the vicinity of the Arctic Circle. Its magnitude of 4.5 means that naked-eye visibility is dependent on a sky sufficiently free from the effects of light pollution. The best time for observation in the evening sky falls in the months between May and September; from both hemispheres of the period of visibility remains approximately the same, thanks to the position of the star not far from the celestial equator. Physical Iota1 Librae is a four star system. The inner pair, designated components Aa an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
16 Librae
16 Librae is a star in the constellation Libra. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.49. An annual parallax shift of 37.17 mas yields a distance estimate of 87.7 light years. It is moving further from the Sun with a radial velocity of +26 km/s. This is an ordinary F-type main-sequence star with a stellar classification of F2 V. It is an estimated 660 million years old and is spinning rapidly with a projected rotational velocity of 113 km/s. The star has 1.47 times the mass of the Sun and is radiating nearly 10 times the Sun's luminosity from its photosphere at an effective temperature of about 7,187 K. 16 Librae has a common proper motion companion located at an angular separation of 22.8 arc seconds along a position angle of 297°, as of 1999. Designated component B, this is a red dwarf ''Red Dwarf'' is a British science fiction comedy franchise created by Rob Grant and Doug N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta Librae
θ Librae, Latinised as Theta Librae, is a single star in the southern zodiac constellation of Libra, near the constellation border with Scorpius. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.14. The distance to this star is approximately 168 light years, as determined by parallax, and it is drifting further away with a radial velocity of 5 km/s. The position of this star near the ecliptic means it is subject to lunar occultations. This object is an aging giant star with a stellar classification of G9IIIb. Having exhausted the supply of hydrogen at its core, it has cooled and expanded; at present it has 12.3 times the girth of the Sun. The star has an estimated mass about 47% greater than the Sun. It is radiating about 68 times the luminosity of the Sun from its photosphere at an effective temperature of about . It is probably on the red giant branch, which indicates it is generating energy through hydrogen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zubenelhakrabi
Gamma Librae (γ Librae, abbreviated Gamma Lib, γ Lib) is a suspected binary star system in the constellation of Libra. It is visible to the naked eye, having an apparent visual magnitude of +3.91. Based upon an annual parallax shift of 19.99 mas as seen from Earth, it lies 163 light years from the Sun. The primary component (designated Gamma Librae A) has been formally named Zubenelhakrabi , the traditional name of the system. Nomenclature ''γ Librae'' ( Latinised to ''Gamma Librae'') is the system's Bayer designation. The designations of the two components as ''Gamma Librae A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). Gamma Librae bore the traditional name ''Zuben (el) Hakrabi'' (also rendered as ''Zuben-el-Akrab'' and corrupted as ''Zuben Hakraki''). The name is a modification of the Arabic زبانى العقرب ''Zubān ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Librae
Gamma Librae (γ Librae, abbreviated Gamma Lib, γ Lib) is a suspected binary star system in the constellation of Libra. It is visible to the naked eye, having an apparent visual magnitude of +3.91. Based upon an annual parallax shift of 19.99 mas as seen from Earth, it lies 163 light years from the Sun. The primary component (designated Gamma Librae A) has been formally named Zubenelhakrabi , the traditional name of the system. Nomenclature ''γ Librae'' ( Latinised to ''Gamma Librae'') is the system's Bayer designation. The designations of the two components as ''Gamma Librae A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). Gamma Librae bore the traditional name ''Zuben (el) Hakrabi'' (also rendered as ''Zuben-el-Akrab'' and corrupted as ''Zuben Hakraki''). The name is a modification of the Arabic زبانى العقرب ''Zubā ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau Librae
Tau Librae, Latinized from τ Librae, is the Bayer designation for a binary star system at the southern edge of the zodiac constellation of Libra. It can be seen with the naked eye, having an apparent visual magnitude of 3.68. The distance to this system is around 367 light years, as determined from an annual parallax shift of 8.89 mas. Judging by its motion through space and physical properties, this system is a member of the Upper Centaurus–Lupus group of the Scorpius–Centaurus association. It is double-lined spectroscopic binary with an orbital period of just 3.3 days and an eccentricity of 0.28. The primary, component A, is a B-type main sequence star with a stellar classification of B2.5 V. It is estimated to hold more than seven times the mass of the Sun and have over three times the Sun's radius. It is only 31.5 million years old and is spinning relatively rapidly with a projected rotational velocity of 134 km/s. It is a heartbeat star ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upsilon Librae
Upsilon Librae (υ Lib, υ Librae) is the Bayer designation for a double star in the zodiac constellation Libra. With an apparent visual magnitude of 3.628, it is visible to the naked eye. The distance to this star, based upon an annual parallax shift of 14.58, is around 224 light years. It has a magnitude 10.8 companion at an angular separation of 2.0 arc seconds along a position angle of 151°, as of 2002. The brighter component is an evolved K-type giant star with a stellar classification of K3 III. The measured angular diameter, after correction for limb darkening, is . At the estimated distance of the star, this yields a physical size of about 31.5 times the radius of the Sun. It has 1.67 times the mass of the Sun and radiates 309 times the solar luminosity from its outer atmosphere at an effective temperature of 4,135 K. The star is about three billion years old. In around 2.3 million years, Upsilon Librae will be the brightest star in the nigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semiregular Variable
In astronomy, a semiregular variable star, a type of variable star, is a giant or supergiant of intermediate and late (cooler) spectral type showing considerable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to more than 2000 days, while the shapes of the light curves may be rather different and variable with each cycle. The amplitudes may be from several hundredths to several magnitudes (usually 1-2 magnitudes in the V filter). Classification The semiregular variable stars have been sub-divided into four categories for many decades, with a fifth related group defined more recently. The original definitions of the four main groups were formalised in 1958 at the tenth general assembly of the International Astronomical Union (IAU). The General Catalogue of Variable Stars (GCVS) has updated the definitions with some additional information and provided newer reference stars where old examples such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scorpius
Scorpius is a zodiac constellation located in the Southern celestial hemisphere, where it sits near the center of the Milky Way, between Libra to the west and Sagittarius to the east. Scorpius is an ancient constellation that pre-dates the Greeks; it is one of the 48 constellations identified by the Greek astronomer Ptolemy in the second century. Its old astronomical symbol is (♏︎). Notable features Stars Scorpius contains many bright stars, including Antares (α Sco), "rival of Mars," so named because of its distinct reddish hue; β1 Sco (Graffias or Acrab), a triple star; δ Sco (Dschubba, "the forehead"); θ Sco (Sargas, of unknown origin); ν Sco (Jabbah); ξ Sco; π Sco (Fang); σ Sco (Alniyat); and τ Sco (Paikauhale). Marking the tip of the scorpion's curved tail are λ Sco (Shaula) and υ Sco (Lesath), whose names both mean "sting." Given their proximity to one another, λ Sco and υ Sco are sometimes referred to as the Cat's Eyes. The constellation' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sigma Librae
Sigma Librae (σ Librae, abbreviated Sigma Lib, σ Lib) is a binary star in the constellation of Libra (constellation), Libra. The apparent visual magnitude is +3.29, making it visible to the naked eye. Based upon parallax measurements, this system is at a distance of roughly from the Sun, with a 2% margin of error. At that distance, the visual magnitude is diminished by 0.20 ± 0.17 from extinction (astronomy), extinction caused by intervening gas and dust. The two components are designated Sigma Librae A (officially named Brachium , the traditional name for the system) and B. Nomenclature ''σ Librae'' (Latinisation of names, Latinised to ''Sigma Librae'') is the system's current Bayer designation (the star originally bore the designation Gamma Scorpii) and did not receive its current designation until the new designation was agreed upon by Commission 3 of the International Astronomical Union (IAU) on July 31, 1930.) The designations of the two components as ''Sigma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
