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Tabit
Pi3 Orionis (π3 Orionis, abbreviated Pi3 Ori, π3 Ori), also named Tabit , is a star in the celestial equator, equatorial constellation of Orion (constellation), Orion. At an apparent visual magnitude of 3.16, it is Bortle Dark-Sky Scale, readily visible to the naked eye and is the brightest star in the lion's hide (or shield) that Orion is holding. As measured using the parallax technique, it is distant from the Sun. Nomenclature ''π3 Orionis'' (Latinisation of names, Latinised to ''Pi3 Orionis'') is the system's Bayer designation. It bore the traditional name of 'Tabit', from the Arabic الثابت ''al-thābit'' 'the endurer (the fixed/constant one)'. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN approved the name ''Tabit'' for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. In Chinese astronomy, Chinese, (), meaning ''Net (Chinese c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tabit (town)
Tabit, also spelled Thabit, is a town in North Darfur, Sudan. It has a population of 7,000 and lies thirty miles southwest of Al-Fashir. Most of the inhabitants belong to the Fur people. In 2011, the surrounding area suffered intense conflict. An investigation by Human Rights Watch (HRW) released in February 2015 said 221 were raped, which had also been reported days after the town was attacked but verification was difficult, by government soldiers in "a mass rape that could constitute crimes against humanity". War in Darfur#2014, Witnesses said three separate operations were carried out in 30 October to 1 November 2014. In addition to the rape of women and girls, they reported that property was looted, men arrested and residents beaten. The town had been controlled by rebel forces previously but HRW found no evidence that the rebel fighters were in or close to the town when it was attacked. References Populated places in North Darfur {{Sudan-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6 Orionis
This is the list of notable stars in the constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ... Orion, sorted by decreasing brightness. See also * List of stars by constellation References * * * * * {{Portal bar, Astronomy, Stars, Outer space *List Orion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apparent Visual Magnitude
Apparent magnitude () is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer. Unless stated otherwise, the word ''magnitude'' in astronomy usually refers to a celestial object's apparent magnitude. The magnitude scale likely dates to before the ancient Roman astronomer Claudius Ptolemy, whose star catalog popularized the system by listing stars from 1st magnitude (brightest) to 6th magnitude (dimmest). The modern scale was mathematically defined to closely match this historical system by Norman Pogson in 1856. The scale is reverse logarithmic: the brighter an object is, the lower its magnitude number. A difference of 1.0 in magnitude corresponds to the brightness ratio of \sqrt /math>, or about 2.512. For example, a magnitude 2.0 star is 2. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pi2 Orionis
Pi2 Orionis (π2 Ori, π2 Orionis) is the Bayer designation for a solitary star in the equatorial constellation of Orion. Although the ''Bright Star Catalogue'' lists this as a spectroscopic binary star system, this does not appear to be the case. It is visible to the naked eye with an apparent visual magnitude of 4.35. Based upon an annual parallax shift of 14.53 mas, it is located roughly 224 light-years away from the Sun. This is an A-type main-sequence star with a stellar classification of A1 Vn, where the 'n' indicates broad absorption lines due to rotation. It is spinning rapidly with a projected rotational velocity of 261.4 km/s. This is giving the star an oblate shape with an equatorial bulge that is 13% larger than the polar radius. It is shining with 70 times the solar luminosity from its outer atmosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that woul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pi1 Orionis
Pi1 Orionis (π1 Ori, π1 Orionis) is a star in the equatorial constellation of Orion. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74. Based upon an annual parallax shift of 28.04 mas, it is located about 116 light-years from the Sun. This is an A-type main-sequence star with a stellar classification of A3 Va. It is a Lambda Boötis star, which means the spectrum shows lower-than-expected abundances for heavier elements. Pi1 Orionis is a relatively young star, just 100 million years old, and is spinning fairly rapidly with a projected rotational velocity of 120 km/s. It has nearly double the mass of the Sun and 173% of the Sun's radius. The star radiates 16.9 times the solar luminosity from its outer atmosphere at an effective temperature of . An infrared excess indicates there is a debris disk A debris disk (American English), or debris disc ( Commonwealth English), is a circumstellar disk of dust and debr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omicron2 Orionis
Omicron2 Orionis (ο2 Ori) is a solitary star in the constellation Orion. It has an apparent visual magnitude of 4.06, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.54 mas, it is around 186 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.09 due to intervening dust. This is a red clump giant star with a stellar classification of K2 IIIb. It is around 5.4 billion years old with a projected rotational velocity that is too small to be measured. The star has expanded to about 15 times the radius of the Sun and shines with 79 times the solar luminosity from its outer atmosphere at an effective temperature of 4,498 K. Omicron2 Orionis is most likely a member of the Milky Way's thin disk The thin disk is a structural component of spiral and S0-type galaxies, composed of stars, gas and dust. It is the main non-centre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omicron1 Orionis
Omicron1 Orionis (ο1 Ori) is a binary star in the northeastern corner of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.7. Based upon an annual parallax shift of , it is located approximately 650 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.27 due to intervening dust. The two components of this system have an orbital period of greater than 1,900 days (5.2 years). The primary component is an evolved red giant with the stellar classification of M3S III. This is an S-type star on the asymptotic giant branch. The variability of the brightness of ο1 Orionis was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.It is a semiregular variable that is pulsating with periods of 30.8 and 70.7 days, each with nearly identical amplitudes of 0.05 in magnitude. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterism (astronomy)
An asterism is an observational astronomy, observed pattern or group of stars in the sky. Asterisms can be any identified star pattern, and therefore are a more general concept than the IAU designated constellations, 88 formally defined constellations. Constellations are based upon asterisms, but unlike asterisms, constellations are defined regions with official boundaries which together encompass the entire sky. Asterisms range from simple shapes of just a few stars to more complex collections of many stars covering large portions of the sky. The stars themselves may be bright naked-eye objects or fainter, even telescopic, but they are generally all of a similar brightness to each other. The larger brighter asterisms are useful for people who are familiarizing themselves with the night sky. The patterns of stars seen in asterisms are not necessarily a product of any physical association between the stars, but are rather the result of the particular perspectives of their observ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Net (Chinese Constellation)
The Net mansion () is one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger. Asterisms References {{DEFAULTSORT:Net (Chinese Constellation) Chinese constellations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinese Astronomy
Astronomy in China has a long history stretching from the Shang dynasty, being refined over a period of more than 3,000 years. The Ancient China, ancient Chinese people have identified stars from 1300 BCE, as Chinese star names later categorized in the twenty-eight mansions have been found on oracle bones unearthed at Anyang, dating back to the mid-Shang dynasty. The core of the "mansion" (宿 ''xiù'') system also took shape around this period, by the time of King Wu Ding (1250–1192 BCE). Detailed records of astronomical observations began during the Warring States period (fourth century BCE). They flourished during the Han period (202 BCE – 220 CE) and subsequent dynasties with the publication of star catalogues. Chinese astronomy was equatorial, centered on close observation of circumpolar stars, and was based on different principles from those in traditional Western astronomy, where heliacal risings and settings of zodiac constellations formed the basic ecliptic framew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. It operates under Division C – Education, Outreach and Heritage. The IAU states that it is keen to make a distinction between the terms ''name'' and ''designation''. To the IAU, ''name'' refers to the (usually colloquial) term used for a star in everyday conversation, while ''designation'' is solely alphanumerical, and used almost exclusively in official catalogues and for professional astronomy. (The WGSN notes that transliterated Bayer designations (e.g., Tau Ceti) are considered a special historical case and are treated as designations.) Terms of reference The terms of reference for the WGSN for the period 2016–2018 were approved by the IAU Executive Committee at its meeting on 6 May 2016. In summary, these are to: * establish IAU guidelines for the proposal and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabic
Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns language codes to 32 varieties of Arabic, including its standard form of Literary Arabic, known as Modern Standard Arabic, which is derived from Classical Arabic. This distinction exists primarily among Western linguists; Arabic speakers themselves generally do not distinguish between Modern Standard Arabic and Classical Arabic, but rather refer to both as ( "the eloquent Arabic") or simply ' (). Arabic is the List of languages by the number of countries in which they are recognized as an official language, third most widespread official language after English and French, one of six official languages of the United Nations, and the Sacred language, liturgical language of Islam. Arabic is widely taught in schools and universities around the wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
