Faster access than browser!
36 relations: Alpha Librae, Alpha Phoenicis, Apparent magnitude, Arabic, Asymptotic giant branch, Bayer designation, Binary star, Bright Star Catalogue, Catalogues of Fundamental Stars, Constellation, Durchmusterung, Epoch (astronomy), Extinction (astronomy), Flamsteed designation, Gamma Librae, Henry Draper Catalogue, Hipparcos, IAU Working Group on Star Names, International Astronomical Union, International Celestial Reference System, Latin, Latinisation of names, Libra (constellation), Margin of error, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, Parallax, Red giant, Semiregular variable star, Smithsonian Astrophysical Observatory Star Catalog, Star system, Stellar classification, Stellar evolution, Sun, Variable star, Washington Double Star Catalog.
Alpha Librae
Alpha Librae (α Librae, abbreviated Alpha Lib, α Lib), is a double star and despite its 'alpha' designation the second-brightest star in the constellation of Libra.
New!!: Sigma Librae and Alpha Librae · See more »
Alpha Phoenicis
Alpha Phoenicis (α Phoenicis, abbreviated Alpha Phe or α Phe), also named Ankaa, is the brightest star in the constellation of Phoenix.
New!!: Sigma Librae and Alpha Phoenicis · See more »
Apparent magnitude
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
New!!: Sigma Librae and Apparent magnitude · See more »
Arabic
Arabic (العَرَبِيَّة) or (عَرَبِيّ) or) is a Central Semitic language that first emerged in Iron Age northwestern Arabia and is now the lingua franca of the Arab world. It is named after the Arabs, a term initially used to describe peoples living from Mesopotamia in the east to the Anti-Lebanon mountains in the west, in northwestern Arabia, and in the Sinai peninsula. Arabic is classified as a macrolanguage comprising 30 modern varieties, including its standard form, Modern Standard Arabic, which is derived from Classical Arabic. As the modern written language, Modern Standard Arabic is widely taught in schools and universities, and is used to varying degrees in workplaces, government, and the media. The two formal varieties are grouped together as Literary Arabic (fuṣḥā), which is the official language of 26 states and the liturgical language of Islam. Modern Standard Arabic largely follows the grammatical standards of Classical Arabic and uses much of the same vocabulary. However, it has discarded some grammatical constructions and vocabulary that no longer have any counterpart in the spoken varieties, and has adopted certain new constructions and vocabulary from the spoken varieties. Much of the new vocabulary is used to denote concepts that have arisen in the post-classical era, especially in modern times. During the Middle Ages, Literary Arabic was a major vehicle of culture in Europe, especially in science, mathematics and philosophy. As a result, many European languages have also borrowed many words from it. Arabic influence, mainly in vocabulary, is seen in European languages, mainly Spanish and to a lesser extent Portuguese, Valencian and Catalan, owing to both the proximity of Christian European and Muslim Arab civilizations and 800 years of Arabic culture and language in the Iberian Peninsula, referred to in Arabic as al-Andalus. Sicilian has about 500 Arabic words as result of Sicily being progressively conquered by Arabs from North Africa, from the mid 9th to mid 10th centuries. Many of these words relate to agriculture and related activities (Hull and Ruffino). Balkan languages, including Greek and Bulgarian, have also acquired a significant number of Arabic words through contact with Ottoman Turkish. Arabic has influenced many languages around the globe throughout its history. Some of the most influenced languages are Persian, Turkish, Spanish, Urdu, Kashmiri, Kurdish, Bosnian, Kazakh, Bengali, Hindi, Malay, Maldivian, Indonesian, Pashto, Punjabi, Tagalog, Sindhi, and Hausa, and some languages in parts of Africa. Conversely, Arabic has borrowed words from other languages, including Greek and Persian in medieval times, and contemporary European languages such as English and French in modern times. Classical Arabic is the liturgical language of 1.8 billion Muslims and Modern Standard Arabic is one of six official languages of the United Nations. All varieties of Arabic combined are spoken by perhaps as many as 422 million speakers (native and non-native) in the Arab world, making it the fifth most spoken language in the world. Arabic is written with the Arabic alphabet, which is an abjad script and is written from right to left, although the spoken varieties are sometimes written in ASCII Latin from left to right with no standardized orthography.
New!!: Sigma Librae and Arabic · See more »
Asymptotic giant branch
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
New!!: Sigma Librae and Asymptotic giant branch · See more »
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
New!!: Sigma Librae and Bayer designation · See more »
Binary star
A binary star is a star system consisting of two stars orbiting around their common barycenter.
New!!: Sigma Librae and Binary star · See more »
Bright Star Catalogue
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.
New!!: Sigma Librae and Bright Star Catalogue · See more »
Catalogues of Fundamental Stars
The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
New!!: Sigma Librae and Catalogues of Fundamental Stars · See more »
Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
New!!: Sigma Librae and Constellation · See more »
Durchmusterung
In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
New!!: Sigma Librae and Durchmusterung · See more »
Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
New!!: Sigma Librae and Epoch (astronomy) · See more »
Extinction (astronomy)
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
New!!: Sigma Librae and Extinction (astronomy) · See more »
Flamsteed designation
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
New!!: Sigma Librae and Flamsteed designation · See more »
Gamma Librae
Gamma Librae (γ Librae, abbreviated Gam Lib, γ Lib) is a suspected binary star system in the constellation of Libra.
New!!: Sigma Librae and Gamma Librae · See more »
Henry Draper Catalogue
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
New!!: Sigma Librae and Henry Draper Catalogue · See more »
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
New!!: Sigma Librae and Hipparcos · See more »
IAU Working Group on Star Names
The International Astronomical Union (IAU) established a Working Group on Star Names (WGSN) in May 2016 to catalog and standardize proper names for stars for the international astronomical community.
New!!: Sigma Librae and IAU Working Group on Star Names · See more »
International Astronomical Union
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
New!!: Sigma Librae and International Astronomical Union · See more »
International Celestial Reference System
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
New!!: Sigma Librae and International Celestial Reference System · See more »
Latin
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
New!!: Sigma Librae and Latin · See more »
Latinisation of names
Latinisation or Latinization is the practice of rendering a non-Latin name (or word) in a Latin style.
New!!: Sigma Librae and Latinisation of names · See more »
Libra (constellation)
Libra is a constellation of the zodiac.
New!!: Sigma Librae and Libra (constellation) · See more »
Margin of error
The margin of error is a statistic expressing the amount of random sampling error in a survey's results.
New!!: Sigma Librae and Margin of error · See more »
Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
New!!: Sigma Librae and Minute and second of arc · See more »
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
New!!: Sigma Librae and Monthly Notices of the Royal Astronomical Society · See more »
Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
New!!: Sigma Librae and Parallax · See more »
Red giant
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
New!!: Sigma Librae and Red giant · See more »
Semiregular variable star
Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities.
New!!: Sigma Librae and Semiregular variable star · See more »
Smithsonian Astrophysical Observatory Star Catalog
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
New!!: Sigma Librae and Smithsonian Astrophysical Observatory Star Catalog · See more »
Star system
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
New!!: Sigma Librae and Star system · See more »
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
New!!: Sigma Librae and Stellar classification · See more »
Stellar evolution
Stellar evolution is the process by which a star changes over the course of time.
New!!: Sigma Librae and Stellar evolution · See more »
Sun
The Sun is the star at the center of the Solar System.
New!!: Sigma Librae and Sun · See more »
Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
New!!: Sigma Librae and Variable star · See more »
Washington Double Star Catalog
The Washington Double Star Catalog, or WDS, is a catalog of double stars, maintained at the United States Naval Observatory.
New!!: Sigma Librae and Washington Double Star Catalog · See more »
Redirects here:
20 Librae, Gamma Scorpii, Γ Scorpii, Σ Librae.
References
[1] https://en.wikipedia.org/wiki/Sigma_Librae
