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Ophiuchus (Chinese Astronomy)
The modern constellation Ophiuchus lies across two of the quadrants symbolized by the Azure Dragon of the East (東方青龍, ''Dōng Fāng Qīng Lóng'') and The Black Tortoise of the North (北方玄武, ''Běi Fāng Xuán Wǔ''), and Three Enclosures (三垣, ''Sān Yuán''), that divide the sky in traditional Chinese uranography. The name of the western constellation in modern Chinese is 蛇夫座 (''shé fū zuò''), which means "the snake man constellation". Stars The map of Chinese constellation in constellation Ophiuchus area consists of : See also *Traditional Chinese star names *Chinese constellations Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese ''xīng guān''). The Chinese asterisms are generally smaller than the constellations of Hellenistic t ... References {{Reflist External linksOphiuchus – Chinese associations香港太空館https://web.archive.org/web/2012 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophiuchus (constellation)
Ophiuchus () is a large constellation straddling the celestial equator. Its name comes from the Ancient Greek (), meaning "serpent-bearer", and it is commonly represented as a man grasping a snake. The serpent is represented by the constellation Serpens. Ophiuchus was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. An old alternative name for the constellation was Serpentarius (). Location Ophiuchus lies between Aquila, Serpens, Scorpius, Sagittarius, and Hercules, northwest of the center of the Milky Way. The southern part lies between Scorpius to the west and Sagittarius to the east. In the northern hemisphere, it is best visible in summer. It is opposite of Orion. Ophiuchus is depicted as a man grasping a serpent; the interposition of his body divides the snake constellation Serpens into two parts, Serpens Caput and Serpens Cauda. Ophiuchus straddles the equator with the majority ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeta Ophiuchi
Zeta Ophiuchi (ζ Oph, ζ Ophiuchi) is a single star located in the constellation of Ophiuchus. It has an apparent visual magnitude of 2.6, making it the third-brightest star in the constellation. Parallax measurements give an estimated distance of roughly from the Earth. It is surrounded by the Sh2-27 "Cobold" nebula, the star's bow shock as it ploughs through dense dust clouds near the Rho Ophiuchi cloud complex. In April 2010, Zeta Ophiuchi was occulted by asteroid 824 Anastasia. Properties ζ Ophiuchi is an enormous star with more than 19 times the Sun's mass and eight times its radius. The stellar classification of this star is O9.5 V, with the luminosity class of V indicating that it is generating energy in its core by the nuclear fusion of hydrogen. From Earth, the apparent effective temperature of the star appears to be 34,300K, giving the star the blue hue of an O-type star. However, since the star is rapidly rotating, the exact surface temperature varies acr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
41 Ophiuchi
41 Ophiuchi is a binary star system in the zodiac constellation of Ophiuchus, and is positioned less than half a degree to the south of the celestial equator. It is visible to the naked eye as a faint, orange-hued point of light with a combined apparent visual magnitude of 4.72. The distance to this system is approximately 202 light years based on parallax. This is a visual binary with an orbital period of 141 years and an eccentricity of 0.866. The magnitude 4.92 primary, designated component A, is an aging K-type giant star with a stellar classification of K2III. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is 3.7 billion years old with 1.46 times the mass of the Sun and has expanded to nearly 12 times the Sun's radius. It is radiating 60 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,509 K. The seconda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sigma Ophiuchi
Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single, orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31, which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s. This is an evolved giant star of type K with a stellar classification of K2 III. Wittkowski et al. (2017) consider it to have a luminosity class of II-III, suggesting it is in a transitional zone between giants and supergiant stars. It has around 5 times the mass of the Sun and 73 times the Sun's radius. The star is radiating 2,047 times the Sun's luminosity from its enlarged photosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
61 Ophiuchi
This is the list of notable stars in the constellation Ophiuchus, sorted by decreasing brightness. See also *List of stars by constellation All stars but one can be associated with an IAU constellation. IAU constellations are areas of the sky. Although there are only 88 IAU constellations, the sky is actually divided into 89 irregularly shaped boxes as the constellation Serpens is spli ... References * * * * {{DEFAULTSORT:Stars in Ophiuchus, List of *List Ophiuchus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Ophiuchi
Gamma Ophiuchi, Latinized from γ Ophiuchi, is a fourth-magnitude star in the constellation Ophiuchus. Together with Beta Ophiuchi, it forms the serpent-holder's right shoulder. The staris visible to the naked eye with an apparent visual magnitude of +3.75. Based upon an annual parallax shift of as seen from Earth, it is located 103 light years from the Sun. It is moving closer to the Sun with a radial velocity of −7.6 km/s. It is known also as Muliphen, although at least two more stars are known with this name: Gamma Canis Majoris (often spelled as Muliphein) and Gamma Centauri (often spelled as Muhlifain). This is an A-type main sequence star with a stellar classification of A0 V. Gray et al. (2003) lists a classification of A1VnkA0mA0, indicating it is of type A1 V with the calcium K-line and metallic lines of an A0 star. It is approximately 184 million years old and is spinning rapidly with a projected rotational velocity of 220 km/s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta Ophiuchi
Beta Ophiuchi or β Ophiuchi, also named Cebalrai , is a star in the equatorial constellation of Ophiuchus. The apparent visual magnitude of this star is 2.7, which is readily visible to the naked eye even from urban skies. The distance to this star can be estimated using parallax measurements, yielding a value of from the Sun. Nomenclature ''β Ophiuchi'' ( Latinised to ''Beta Ophiuchi'') is the star's Bayer designation. It bore the traditional names ''Cebalrai'', ''Celbalrai'', ''Cheleb'' and ''Kelb Alrai'' (or sometimes just ''Alrai''), all derived from the Arabic كلب الراعي ''kalb al-rā‘ī'' "the shepherd's dog". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name ''Cebalrai'' for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names. Namesake USS Cheleb (AK-138) was a United States Navy Crater class ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
30 Ophiuchi
30 Ophiuchi is a single star in the equatorial constellation of Ophiuchus, and figures 0.99° east (specifically E½S) of the heart of cluster Messier 10. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.82. The distance to this star is approximately 350 light years based on parallax. Its present motion is, net, one of approaching rather than parting, at −6.7 km/s, its "radial velocity". This is an aging giant star with a stellar classification of K4III, having exhausted the supply of hydrogen at its core and expanded to 36 times the Sun's radius. It is a suspected variable star. The star is radiating 300 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,009 K. It is emitting a far infrared excess due to circumstellar dust, which extends out to a diameter of and has a mass of . The primary presents with two visual companion In observational ast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
23 Ophiuchi
This is the list of notable stars in the constellation Ophiuchus, sorted by decreasing brightness. See also *List of stars by constellation All stars but one can be associated with an IAU constellation. IAU constellations are areas of the sky. Although there are only 88 IAU constellations, the sky is actually divided into 89 irregularly shaped boxes as the constellation Serpens is spli ... References * * * * {{DEFAULTSORT:Stars in Ophiuchus, List of *List Ophiuchus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20 Ophiuchi
20 Ophiuchi is a class F6IV (yellow-white subgiant) star in the constellation Ophiuchus. Its apparent magnitude is 4.64 and it is approximately 104 light years away based on parallax. It lies near the star Zeta Ophiuchi. 20 Ophiuchi is an astrometric binary. The primary star is a late F-type subgiant star. It has a mass 1.72 times that of the Sun. The companion star regularly perturbs the primary star, causing it to wobble around the barycenter. From this, an orbital period of 35.5 years has been calculated. The secondary star is 0.8 times the mass of the Sun, and it may be a white dwarf or red dwarf ''Red Dwarf'' is a British science fiction comedy franchise created by Rob Grant and Doug Naylor, which primarily consists of a television sitcom that aired on BBC Two between 1988 and 1999, and on Dave since 2009, gaining a cult following. T .... References {{DEFAULTSORT:20 Ophiuchi Ophiuchus (constellation) F-type subgiants BD-10 4394 Ophiuchi, 20 08236 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upsilon Ophiuchi
Upsilon Ophiuchi is a triple star system in the equatorial constellation of Ophiuchus. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.62. The distance to this system is approximately 134 light years based on parallax. It is drifting closer with a radial velocity of −30.6 km/s. The variable radial velocity of the brighter component was first observed by H. A. Abt in 1961. It is a double-lined spectroscopic binary system with an orbital period of 27.2 days and an eccentricity of 0.74. They have a combined magnitude of 4.71. Both components are similar stars with a combined stellar classification of kA2hA5VmA5, and one or both are Am stars. The third component has an 82.8 year orbit with the inner pair at an eccentricity of 0.45. The system is a source for X-ray emission Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays. Sever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
