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Eridanus (Chinese Astronomy)
The modern constellation Eridanus (constellation), Eridanus lies across one of the quadrants symbolized by the White Tiger (Chinese constellation), White Tiger of the West (西方白虎, ''Xī Fāng Bái Hǔ''), and Chinese constellations#The Southern Asterisms (近南極星區), The Southern Asterisms (近南極星區, ''Jìnnánjíxīng'ōu''), that divide the sky in traditional Traditional Chinese star names#Categories of Chinese traditional uranography, Chinese uranography. According to the quadrant, it is possible that the constellation Eridanus (constellation), Eridanus is not fully visible. Alpha Eridani, Achernar (Alpha Eridani) is a bright star in this constellation that may have never been seen in Chinese skies. The name of the western constellation in modern Chinese is 波江座 (''bō jiāng zuò''), meaning "the waving river constellation". Stars The map of Chinese constellation in constellation Eridanus area consists of : See also *Traditional Chinese star names *C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eridanus (constellation)
Eridanus () is a constellation in the southern celestial hemisphere. It is represented as a river. One of the 48 constellations listed by the 2nd century astronomer Ptolemy, it remains one of the 88 modern constellations. It is the sixth largest of the modern constellations, and the one that extends farthest in the sky from north to south. The same name was later taken as a Latin name for the real Po River and also for the name of a minor river in Athens. Features Stars At its southern end is the magnitude 0.5 star Achernar, designated Alpha Eridani. It is a blue-white hued main sequence star 144 light-years from Earth, whose traditional name means "the river's end". Achernar is a very peculiar star because it is one of the flattest stars known. Observations indicate that its radius is about 50% larger at the equator than at the poles. This distortion occurs because the star is spinning extremely rapidly. There are several other noteworthy stars in Eridanus, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eta Eridani
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly ), is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun. Nomenclature ''η Eridani'' ( Latinised to ''Eta Eridani'') is the star's Bayer designation. It bore the traditional name ''Azha'', from the old Arab asterism نَعَام أُدْحِيّ ''udḥiyy al-naʽām'' "the ostrich nest" (or "hatching place"), which included Eta Eridani. The first word, ادحى ''udḥiyy'', was miscopied as ازحى (readable as ''azḥā'') in medieval manuscripts. 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 ''Azha'' for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. In Chinese, (), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4 Eridani
This is the list of notable stars in the constellation Eridanus, 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:List of stars in Eridanus *List Eridanus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6 Eridani
This is the list of notable stars in the constellation Eridanus, 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:List of stars in Eridanus *List Eridanus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
15 Eridani
15 Eridani is a binary star system in the equatorial constellation of Eridanus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.875. Based upon parallax measurements, the system is located around 260 light years away from the Sun. It is moving further from the Earth with a heliocentric radial velocity of 24 km/s. This system has an orbital period of 118.16 years with an eccentricity of 0.030 and a semimajor axis of . The primary member, designated component A, is a magnitude 5.32 giant star with a stellar classification of K0 III. It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. This star has 1.44 billion years old with 2.32 times the mass of the Sun. It is radiating 72.4 times the luminosity of the Sun from its enlarged photosphere at an effective temperature The effective temperature of a body such as a star or plane ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20 Eridani
This is the list of notable stars in the constellation Eridanus, 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:List of stars in Eridanus *List Eridanus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau9 Eridani
Tau9 Eridani (τ9 Eri) is a binary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.63. The distance to this system can be estimated using the parallax method, which yields a value of roughly 327 light years. This is a single-lined spectroscopic binary system with an orbital period of 5.95382 days and an eccentricity of 0.12. The primary component, τ9 Eri A, is a magnetic chemically peculiar star with a stellar classification of , indicating that it is a B-type main sequence star that shows abundance anomalies in its silicon absorption lines. It is an Alpha² Canum Venaticorum variable with a rotational periodicity of 5.954 days. The averaged strength of the stellar effective magnetic field is . The primary component Tau9 Eridani A has an estimated 326% the mass of the Sun and 3.1 times the Sun's radius. It shines with 166 times the solar luminosity from an outer atmosphere at an effective tem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau8 Eridani
Tau8 Eridani, Latinized from τ8 Eridani, is a binary star system in the constellation Eridanus. It is visible to the naked eye with a combined apparent visual magnitude of 4.65. The distance to this system can be estimated via the parallax method, yielding a value of around 380 light years. This is a single-lined spectroscopic binary star system with an orbital period of about 459 days and an eccentricity of 0.18. The primary component is a B-type main sequence star with a stellar classification of B6 V. It is a slowly pulsating B-type star that undergoes radial-velocity variation with a frequency of 1.1569 times per day. The star has about five times the mass of the Sun and shines with 256 times the Sun's luminosity. The outer atmosphere has an effective temperature of 11,858 K and may possess a longitudinal magnetic field with a strength of . References {{DEFAULTSORT:Tau8 Eridani B-type main-sequence stars Slowly pulsating B stars Erid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau7 Eridani
Tau7 Eridani is a solitary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 5.235. Using the parallax method, the distance to this star can be estimated as around 251 light years. This is an A-type main sequence star with a stellar classification of A3 Vs, where the 's' indicates it has narrow absorption lines. It may be a chemically peculiar Am star, which means it displays unusual abundances of certain elements in its surface layers. Tau7 Eridani appears to be a low amplitude variable that displays slight fluctuations in luminosity over a period of 7.17 days. It is slowly rotating with a projected rotational velocity of 18 km/s, and is around 387 million years old. References {{DEFAULTSORT:Tau7 Eridani A-type main-sequence stars Eridanus (constellation) Eridani, Tau7 Eridani, 28 023878 017717 1181 Year 1181 ( MCLXXXI) was a common year starting on Thursday (link will displ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau6 Eridani
Tau6 Eridani, Latinized from τ6 Eridani, is a single star in the equatorial constellation of Eridanus, located near the constellation border with Fornax. It has a yellow-white hue with an apparent visual magnitude of 4.22, which is bright enough to be seen with the naked eye. Based upon parallax measurements, the distance to this star is around 57.5 light years. It is drifting further away with a radial velocity of +8 km/s. The spectrum of Tau6 Eridani matches a stellar classification of F5IV-V, indicating it is an F-type star that shows traits of both a main sequence star and a subgiant. It has an estimated 135% of the Sun's mass and about 1.8 time the radius of the Sun. The star is radiating 5.5 times the luminosity of the Sun at an effective temperature of 6,508 K, and it does not display any surface magnetic activity. The star has been examined for infrared excess emission that could indicate the presence of circumstellar matter, but none has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau5 Eridani
Tau5 Eridani, Latinized from τ5 Eridani, is a binary star system in the constellation Eridanus. It is visible to the naked eye with a combined apparent visual magnitude of 4.26. The distance to this system, as estimated using the parallax technique, is around 293 light years. Tau5 Eridani is a double-lined spectroscopic binary system. The two stars orbit each other closely with a period of 6.2 days and an eccentricity of 0.2. On average, the two stars are separated by around 0.183 AU. The primary component is a B-type main sequence star with a stellar classification of B0 V. It is around 157 million years old and is spinning with a projected rotational velocity of 55 km/s. The star has around 3.3 times the mass of the Sun and 3.2 times the Sun's radius. It radiates 188 times the solar luminosity from an outer atmosphere at an effective temperature of 12,514 K. The secondary component has a stellar classification of B9&nb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tau4 Eridani
Tau4 Eridani (τ4 Eridani, τ4 Eri) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.65. The distance to this star can be estimated using the parallax method, which yields a value of roughly 300 light years. This is an evolved red giant star currently on the asymptotic giant branch with a stellar classification of M3/4 III. It is a slow irregular variable star of type Lb, undergoing changes in magnitude over the range 3.57−3.72 with a periodicity of 23.8 d. The measured angular diameter of Tau4 Eridani is . At its estimated distance, this yields a physical size of about 106 times the radius of the Sun. It shines with 1,537 times the luminosity of the Sun from an outer atmosphere at an effective temperature of 3,712 K. This is most likely a binary star system. The companion is a magnitude 9.5 star at an angular separation of 5.7 ″ along a position angle of 291°, as of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
