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List Of Stars In Triangulum Australe
This is the list of notable stars in the constellation Triangulum Australe, sorted by decreasing brightness. See also *List of stars by constellation References * * * * * {{Stars of Triangulum Australe Triangulum Australe, *List Lists of stars by constellation, Triangulum Australe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sky, night; their immense distances from Earth make them appear as fixed stars, fixed points of light. The most prominent stars have been categorised into constellations and asterism (astronomy), asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. A star's life star formation, begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and traces of heavier elements. Its stellar mass, total mass mainly determines it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta Trianguli Australis
Beta Trianguli Australis, Latinized from β Trianguli Australis, is a star in the southern constellation of Triangulum Australe. It has an apparent visual magnitude of +2.85, making it the second-brightest star in the constellation. It is approximately from Earth and has an apparent visual magnitude of +2.85. This star has a relatively high rate of proper motion across the celestial sphere. Characteristics It is a F-type main-sequence star with a stellar classification of F1 V. It has 1.61 times the Sun's mass and 1.98 times the Sun's radius. It radiates 9.3 times the Sun's luminosity from its photosphere at an effective temperature of . The abundance of elements heavier than hydrogen and helium, what astronomers term metallicity, is somewhat lower than that of the Sun. Observation with the Spitzer Space Telescope reveals what appears to be an excess infrared emission from this star. This suggests the presence of circumstellar material in this system, making it a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta Trianguli Australis
θ Trianguli Australis, Latinized as Theta Trianguli Australis, is a single star in the southern constellation of Triangulum Australe. It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of +5.50. The star is located about 345 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +11 km/s. This is an evolved G/ K-type giant star with a stellar classification of G8-K0 III. This star is 2.6 times more massive than the Sun, but has expanded to ten times the radius of the Sun. It is radiating 65 times the Sun's luminosity from its 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 of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ... of 5,071 K. References {{DEFAULTSORT:Theta Tria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multiple Star
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. It may sometimes be used to refer to a single star. A large group of stars bound by gravitation is generally called a ''star cluster'' or ''galaxy'', although, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies (such as comets). Terminology A star system of two stars is known as a ''binary star'', ''binary star system'' or ''physical double star''. Systems with four or more components are rare, and are much less commonly found than those with 2 or 3. Multiple-star systems are called ''triple'', ''ternary'', or ''trinary'' if they contain three stars; ''quadruple'' or ''quaternary'' if they contain four stars; ''quintuple'' or ''quintenary'' with five stars; ''sextuple'' or ''sextenary'' with six stars; ''septuple'' or ''septenary'' with seven stars; and ''octuple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Doradus Variable
Gamma Doradus variables are variable stars which display variations in luminosity due to non-radial pulsations of their surface. The stars are typically young, early F or late A type main sequence In astronomy, the main sequence is a classification of stars which appear on plots of stellar color index, color versus absolute magnitude, brightness as a continuous and distinctive band. Stars on this band are known as main-sequence stars or d ... stars, and typical brightness fluctuations are 0.1 magnitudes with periods on the order of one day. This class of variable stars is relatively new, having been first characterized in the second half of the 1990s, and details on the underlying physical cause of the variations remains under investigation. The star 9 Aurigae was first noticed to be variable in 1990. However, none of the currently-accepted explanations were adequate: it pulsated too slowly and was outside of the Delta Scuti instability strip, and there was no evidence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iota Trianguli Australis
Iota Trianguli Australis (ι Trianguli Australis) is a binary star system in the constellation Triangulum Australe. It is visible to the naked eye with a combined apparent visual magnitude of +5.27. Based upon an annual parallax shift of 25.77 mas as seen from the Earth, it is located around 127 light years from the Sun. The system appears to be moving closer to the Sun with a radial velocity of around −6 km/s. Iota Trianguli Australis is a double-lined spectroscopic binary system with an orbital period of 39.88 days and an eccentricity of 0.25. The brighter member, component A, is yellow-white hued F-type subgiant star and a Gamma Doradus type variable, pulsating by 0.12 magnitudes with a dominant period of 1.45 days. There a magnitude 9.42 visual companion, located 16.2 arcsecond A minute of arc, arcminute (abbreviated as arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of a degree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 148291
HD may refer to: Business * H-D or Harley-Davidson, a motorcycle manufacturer * The Home Depot, NYSE stock symbol: HD Chemistry * Hydrogen deuteride, a diatomic compound of hydrogen and deuterium * Mustard gas Codes * Air Do, formerly Hokkaido International Airlines, IATA designator * HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK * Heidelberg's vehicle registration plate code * Hunedoara County (Romania)'s ISO 3166 code Medicine * Hansen's disease or leprosy * Hirschsprung's disease, a disorder of the abdomen * Huntington's disease, a genetic disorder affecting the central nervous system ** HD (gene) or huntingtin, the IT15 gene, which codes for the huntingtin protein People * H.D. or Hilda Doolittle (1886–1961), American poet and novelist Other uses * ''Helsingborgs Dagblad'', a Swedish newspaper * Henry Draper Catalogue, an astronomical catalogue often used to designate stars * Department of Highways (other) * ''H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semiregular Variable
In astronomy, a semiregular variable star, a type of variable star, is a Red giant, giant or supergiant of intermediate and late (cooler) spectral type. It shows considerable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to more than 2000 days, while the shapes of the light curves may be rather different and variable with each cycle. The amplitudes may be from several hundredths to several Apparent magnitude, magnitudes (usually 1-2 magnitudes in the V filter). Classification The semiregular variable stars have been sub-divided into four categories for many decades, with a fifth related group defined more recently. The original definitions of the four main groups were formalised in 1958 at the tenth general assembly of the International Astronomical Union (IAU). The General Catalogue of Variable Stars (GCVS) has updated the definitions with some additional information and provided newer referenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kappa Trianguli Australis
Kappa Trianguli Australis (κ Trianguli Australis) is a star in the constellation Triangulum Australe. It is a yellow G-type supergiant with an apparent magnitude of +5.08, making it visible to the naked eye under good observing conditions. It is around 1,200 light years from Earth. It is not generally listed as a variable star but Hipparcos ''Hipparcos'' was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions and distances of ... photometry showed small amplitude brightness changes. The dominant period was around 600 days and the amplitude less than a hundredth of a magnitude. References {{DEFAULTSORT:Kappa Trianguli Australis G-type supergiants Trianguli Australis, Kappa Triangulum Australe 141767 077982 5891 Durchmusterung objects Semiregular variable stars ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alpha² Canum Venaticorum Variable
Alpha2 Canum Venaticorum variable (or α2 CVn variable) is a type of magnetic variable star. These are chemically peculiar stars of the CP2 type that are photometrically variable. That is, they are upper main sequence stars of spectral class B8p to A7p, with strong magnetic fields and strong silicon, strontium, or chromium spectral lines. Their brightness typically varies by 0.01 to 0.1 magnitudes over the course of 0.5 to 160 days. The first CP2 variable to be discovered was α2 Canum Venaticorum, a star in the binary system of Cor Caroli, which lies in the northern constellation of Canes Venatici. Its brightness fluctuates by 0.14 magnitudes with a period of 5.47 days. This is now the prototype of the α2 CVn class of variables. In addition to their brightness, the intensities and profiles of the spectral lines of α2 CVn variables vary, as do their magnetic fields. The periods of these variations are all equal and are believed to equal the period of rotation of the sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LP Trianguli Australis
LP or lp may stand for: Businesses and organizations *LP, Limited partnership in corporate law or a Limited Partner in a venture capital fund In politics *Labour Party (other), in several countries *Liberal Party, in several countries *Libertarian Party (United States), or a member thereof * Liberty Party (other), in several countries Schools *Lycée professionnel, French vocational high schools *Lower Primary school, a subdivision of primary schools in certain places *Lorne Park Secondary School, a high school in Mississauga, Ontario, Canada Other businesses and organizations * LAN Perú, an airline based in Lima, Peru (IATA code LP) * Louisiana-Pacific, a manufacturer of building materials * lowercase people, an organization founded by rock band Switchfoot * Ladakh Police, police agency of Ladakh, India * Lonely Planet, travel publisher * Liberapay Science, technology, philosophy Computing and mathematics * lp (Unix), command for printing documents * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeta Trianguli Australis
Zeta Trianguli Australis is a spectroscopic binary star system in the southern constellation Triangulum Australe. The pair have a combined apparent visual magnitude of 4.90, which is bright enough to be visible to the naked eye. Based on parallax measurements, the system is located at a distance of approximately 39.4 light years from Earth. After closing to within some 436,600 years ago, it is now drifting farther away with a radial velocity of +8.3 km/s. The pair orbit each other once every 13 days, and the orbital eccentricity is a low 0.014, making their orbit nearly circular. The primary component has a stellar classification of F9V, matching an F-type main-sequence star. It has a mass equal to 1.12 times the mass of the Sun, a radius 1.06 times the radius of the Sun, and irradiated at an effective temperature of , slightly hotter than the Sun as well. The companion is a small red dwarf star with a class in the range of M1–7V and 40% of the Sun's mass. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
