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Grus (Chinese Astronomy)
The modern constellation Grus lies across one of the quadrants symbolized by the Black Tortoise of the North (北方玄武, ''Běi Fāng Xuán Wǔ''), and The Southern Asterisms (近南極星區, ''Jìnnánjíxīngōu''), that divide the sky in traditional Chinese uranography. Constellation Grus in Chinese sky is not fully seen. Alnair (Alpha Gruis) and Tiaki (Beta Gruis) are bright stars in this constellation that possibly never seen in Chinese sky. The name of the western constellation in modern Chinese is 天鶴座 (''tiān hè zuò''), meaning "the heaven crane constellation". Stars The map of Chinese constellation in constellation Grus area consists of : See also * Traditional Chinese star names *Chinese constellations *List of brightest stars This is a list of stars arranged by their apparent magnitude – their brightness as observed from Earth. It includes all stars brighter than magnitude +2.50 in visible light, measured using a ''V''-band filter in the UBV pho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grus (constellation)
Grus (, or colloquially ) is a constellation in the southern sky. Its name is Latin for the crane, a type of bird. It is one of twelve constellations conceived by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman. Grus first appeared on a celestial globe published in 1598 in Amsterdam by Plancius and Jodocus Hondius and was depicted in Johann Bayer's star atlas ''Uranometria'' of 1603. French explorer and astronomer Nicolas-Louis de Lacaille gave Bayer designations to its stars in 1756, some of which had been previously considered part of the neighbouring constellation Piscis Austrinus. The constellations Grus, Pavo, Phoenix and Tucana are collectively known as the "Southern Birds". The constellation's brightest star, Alpha Gruis, is also known as Alnair and appears as a 1.7-magnitude blue-white star. Beta Gruis is a red giant variable star with a minimum magnitude of 2.3 and a maximum magnitude of 2.0. Six star systems have been foun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iota Gruis
Iota Gruis, Latinized from ι Gruis, is a binary star system in the southern constellation of Grus. It has an apparent visual magnitude of 3.90, which is bright enough to be seen with the naked eye at night. The distance to this system, as determined using an annual parallax shift of 17.80 mas as seen from the Earth, is about 183 light years. This is a single-lined spectroscopic binary with an orbital period of and an eccentricity of 0.66. The yellow-hued primary component is an evolved K-type giant star with a stellar classification of K1 III. It is an X-ray An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30&nb ... emitter with a flux of . References {{DEFAULTSORT:Iota Gruis K-type giants Spectroscopic binaries Grus (constellation) Gruis, Iota 218670 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Brightest Stars
This is a list of stars arranged by their apparent magnitude – their brightness as observed from Earth. It includes all stars brighter than magnitude +2.50 in visible light, measured using a ''V''-band filter in the UBV photometric system. Stars in binary systems (or other multiples) are listed by their ''total'' or ''combined'' brightness if they appear as a single star to the naked eye, or listed separately if they do not. As with all magnitude systems in astronomy, the scale is logarithmic and inverted i.e. lower/more negative numbers are brighter. Most stars on this list appear bright from Earth because they are nearby, not because they are intrinsically luminous. For a list which compensates for the distances, converting the ''apparent'' magnitude to the ''absolute'' magnitude, see the list of most luminous stars. Measurement The Sun is the brightest star as viewed from Earth, at −26.74 mag. The second brightest is Sirius at −1.46 mag. For c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta1 Gruis
Delta1 Gruis, Latinized from δ1 Gruis, is a candidate binary star system in the constellation Grus. With a peak apparent visual magnitude of 4.0 it is bright enough to be seen with the naked eye at night. The distance to this system, as determined using an annual parallax shift of 10.54 mas as seen from the Earth, is around 309 light years. It is gradually moving away from the Sun with a radial velocity of +4.9 km/s. The brighter component of this system is an evolved, yellow-hued, G-type giant star with a stellar classification of G6/8 III. It is a semiregular variable that ranges between apparent magnitudes 3.99 and 4.2, located 325 light-years from Earth. Delta1 Gruis has around 3 times the mass and 24 times the diameter of the Sun. The fainter companion is a magnitude 12.8 star at an angular separation of 5.6 arc seconds, as of 2008. See also *List of stars in Grus This is the list of notable stars in the constellation Grus, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mu2 Gruis
Mu2 Gruis, Latinized from μ2 Gruis, is a yellow-hued star or star system in the southern constellation of Grus. It is a suspected astrometric binary, showing a variation in proper motion due to gravitational acceleration. Mu2 Gruis is visible to the naked eye with an apparent visual magnitude of 5.10. The distance to this system, as determined using an annual parallax shift of 13.2 mas as seen from the Earth, is around 248 light years. It is drifting further away with a heliocentric radial velocity of +12.5 km/s. The primary component is an evolved giant star with a stellar classification of G8 III. It is a periodic variable star, showing a change in brightness with an amplitude of 0.004 magnitude at the rate of 7.50983 times per day. With the supply of hydrogen at its core exhausted, the star has cooled and expanded until now it has 10 times the radius of the Sun. It is radiating 56 times the luminosity of the Sun The solar luminosity () ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mu1 Gruis
Mu1 Gruis, Latinized from μ1 Gruis, is a binary star system in the southern constellation of Grus. It is visible to the naked eye with a combined apparent visual magnitude of 4.79. The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth, is around 275 light years. It is drifting closer with a heliocentric radial velocity of −5 km/s. The pair orbit each other with a period of 19 years and an eccentricity of 0.56. The yellow-hued primary component is an evolved giant star with stellar classification of G III and visual magnitude 5.20. With the supply of hydrogen at its core exhausted, it cooled and expanded; at present it has nine times the girth of the Sun. The star is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,422 K. The secondary component is magnitude 6.68 and classed as a G-type star, although its color index an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta2 Gruis
Delta2 Gruis, Latinized from δ2 Gruis, is a solitary, red-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of about 4. Based upon an annual parallax shift of 9.88 mas as seen from the Earth, the star is located around 330 light years from the Sun. It is moving further away from the Sun with a radial velocity of +3 km/s. This is an evolved red giant star with a stellar classification of M4.5 IIIa. It is a pulsating variable with multiple periods, including 20.6, 24.1, 24.5, and 32.3 days. The strongest period is 33.3 days with an amplitude of 0.043 magnitude. It has a magnitude 9.71 visual companion at an angular separation of 60.4 arc seconds along a position angle In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky. The International Astronomical Union defines it as the angle measured relative to the north celestial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nu Gruis
ν Gruis, Latinised as Nu Gruis, is a solitary, yellow-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 5.47. The distance to this star, as determined using an annual parallax shift of 11.6 mas as seen from the Earth, is 280 light years. It is drifting further away with a heliocentric radial velocity of +11 km/s. This is an evolved G-type giant star with a stellar classification of G9 III, a star that has used up its core hydrogen and has expanded. At present it has ten times the radius of the Sun and is radiating 52 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,893 K. It has a visual magnitude 12.50 companion, not visible even through binoculars, located at an angular separation Angular distance \theta (also known as angular separation, apparent distance, or apparent separation) is the angle between the two sightlines, or between t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rho Gruis
Rho Gruis, a Latinization of ρ Gruis, is a solitary star in the southern constellation of Grus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.85. Based upon an annual parallax shift of 14.16 mas as seen from the Earth, the system is located about 230 light years from the Sun. It is drifting further away with a radial velocity of 31 km/s. This object is an evolved K-type giant star with a stellar classification of K0 III. It has exhausted the supply of hydrogen at its core, causing it to cool and expand. At present it has 12 times the radius of the Sun. With 1.9 times the mass of the Sun it is a red clump star, which indicates it is on the horizontal branch generating energy through helium fusion at its core. It is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,737 K. Rho Gruis has two visual companions: a magnitude 14.0 s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta Gruis
Theta Gruis, Latinized from θ Gruis, is a triple star system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28, which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini Delta Delphini, Latinized from δ Delphini, is a binary star in the northern constellation of Delphinus. It is visible to the naked eye with an apparent visual magnitude of 4.43. Based upon an annual parallax shift of 14.61 mas ...-like F5 star with a close fainter companion, plus a more distant G2 main sequence star. References {{DEFAULTSORT:Theta Gruis Am stars F-type main-sequence stars G-type main-sequence stars Triple star systems Grus (constellation) Gruis, Theta 218227 114131 8787 Durchmusterung objects ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeta Gruis
Zeta Gruis, Latinised from ζ Gruis, is a solitary star in the southern constellation of Grus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.12. Based upon an annual parallax shift of 24.5 mas as seen from the Earth, the system is located about 133 light-years from the Sun. This is an evolved K-type giant star with a stellar classification of , where the suffix notation indicates underabundances of iron and cyanogen in the spectrum. Having exhausted the supply of hydrogen at its core, the star has expanded and cooled; at present it has 10 times the girth of the Sun. The star is radiating 46 times the luminosity of the Sun The solar luminosity (), is a unit of radiant flux ( power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun. One nominal ... from its swollen photosphere at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Tortoise (Chinese Constellation)
The Black Tortoise () is one of the Four Symbols of the Chinese constellations. Despite its English name, it is usually depicted as a tortoise entwined together with a snake. The name used in East Asian languages does not mention either animal; the alternative name "Black Warrior ~ Dark Warrior ~ Mysterious Warrior" is a more faithful translation. It represents the north and the winter season, thus it is sometimes called Xuanwu (Black Tortoise, lit. Black Warrior) of the North (). In Japan, it is named Genbu. It is said to protect Kyoto on the north side, being one of the four guardian spirits that protect the city. It is represented by the Kenkun Shrine, which is located on top of Mt Funaoka in Kyoto. The creature's name is identical to that of the important Taoist god Xuanwu, who is sometimes (as in ''Journey to the West'') portrayed in the company of a turtle and a snake. History During the Han dynasty, people often wore jade pendants that were in the shape of turtle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
