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Alkes
Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), officially named Alkes , is a star in the constellation of Crater. It is a cool giant star about away. Nomenclature ''α Crateris'' ( Latinised to ''Alpha Crateris'') is the star's Bayer designation. It bore the traditional name ''Alkes'', from the Arabic الكاس ''alkās'' or الكأس ''alka's'' "the cup". In the catalogue of stars in the ''Calendarium'' of Al Achsasi al Mouakket, this star was designated ''Aoul al Batjna'' (أول ألباطیة ''awwal al-bāṭiya''), which was translated into Latin as ''Prima Crateris'', meaning "first tarof the Cup". 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 ''Alkes'' for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. In Chinese, (), meaning ''Wings (asterism)'', refers to an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crater (constellation)
Crater is a small constellation in the southern celestial hemisphere. Its name is the latinization of the Greek '' krater'', a type of cup used to water down wine. One of the 48 constellations listed by the second-century astronomer Ptolemy, it depicts a cup that has been associated with the god Apollo and is perched on the back of Hydra the water snake. There is no star brighter than third magnitude in the constellation. Its two brightest stars, Delta Crateris of magnitude 3.56 and Alpha Crateris of magnitude 4.07, are ageing orange giant stars that are cooler and larger than the Sun. Beta Crateris is a binary star system composed of a white giant star and a white dwarf. Seven star systems have been found to host planets. A few notable galaxies, including Crater 2 and NGC 3981, and a famous quasar lie within the borders of the constellation. Mythology In the Babylonian star catalogues dating from at least 1100 BC, the stars of Crater were possibly incorporated with those ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Astronomical Union
The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and development through global cooperation. It was founded in 1919 and is based in Paris, France. The IAU is composed of individual members, who include both professional astronomers and junior scientists, and national members, such as professional associations, national societies, or academic institutions. Individual members are organised into divisions, committees, and working groups centered on particular subdisciplines, subjects, or initiatives. As of 2018, the Union had over 13,700 individual members, spanning 90 countries, and 82 national members. Among the key activities of the IAU is serving as a forum for scientific conferences. It sponsors nine annual symposia and holds a triannual General Assembly that sets policy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 95808
HD 95808 is a double star in the constellation of Crater. Its apparent magnitude is 5.50, but interstellar dust makes it appear 0.11 magnitudes dimmer than it should be. It is located some 340 light-years (104 parsecs) away, based on parallax. HD 95808 is a G-type giant star. At an age of 680 million years old, it has swelled up to a radius of 10.1 times that of the Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ..., and it is 2.43 times as massive. It emits 64.6 times as much energy as the Sun at a surface temperature of 5,029 K. References Crater (constellation) Double stars G-type giants Durchmusterung objects 095808 054029 4305 {{giant-star-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epsilon Crateris
Epsilon Crateris (ε Crateris) is a solitary star in the southern constellation of Crater. Visible to the naked eye, it has an apparent visual magnitude of 4.84. It is located in the sky above Beta Crateris, and slightly to the left, or east, marking the lower right edge of the rim of the bowl and is somewhat closer to Theta Crateris, which is further east at the top of the bowl. With an annual parallax shift of 8.67 mas as seen from the Earth, its estimated distance is around 376 light years from the Sun. This is an evolved K-type giant star with a stellar classification of K5 III. It has about the same mass as the Sun, but has expanded to 44.7 times the Sun's radius. The star is radiating 391 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 would emit the same total amount of electromagnetic radiation. Effective tem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kappa Crateris
Kappa Crateris (κ Crateris) is the Bayer designation for a star in the southern constellation of Crater. It has an apparent visual magnitude of 5.94, which, according to the Bortle scale, can be seen with the naked eye under dark suburban skies. The distance to this star, as determined from an annual parallax shift of 14.27 mas, is around 229 light years. This is an evolved F-type giant star with a stellar classification of F5/6 III, where the F5/6 indicates the spectrum lies intermediate between types F5 and F6. It is an estimated 1.74 billion years old and is spinning with a projected rotational velocity of 39 km/s. Kappa Crateris has 1.74 times the mass of the Sun, and radiates 17 times the solar luminosity from its outer atmosphere at an effective temperature of 6,545 K. Kappa Crateris has a visual companion: a magnitude 13.0 star located at an angular separation of 24.6 arc seconds along a position angle In astronomy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iota Crateris
Iota Crateris (ι Crateris) is the Bayer designation for a binary star system in the southern constellation of Crater. It is faintly visible to the naked eye with an apparent visual magnitude of 5.48. According to the Bortle scale, this means it can be viewed from suburban skies at night. Based upon an annual parallax shift of 37.41 mas, Iota Crateris is located 87 light years from the Sun. This is an astrometric binary system with an estimated orbital period of roughly 79,000 years. The primary, component A, is an F-type main sequence star with a stellar classification of F6.5 V, which is generating energy through the thermonuclear fusion of hydrogen in its core region. It is around 4.45 billion years old with 1.19 times the mass of the Sun. The star is radiating energy from its outer atmosphere at an effective temperature of 6,230 K. The companion, component B, is a red dwarf star with a probable classification of M3, although its mass e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta Crateris
Delta Crateris (δ Crt, δ Crateris; traditional name: Labrum) is a solitary star in the southern constellation of Crater. With an apparent visual magnitude of 3.56, it is the brightest star in this rather dim constellation. It has an annual parallax shift of 17.56 mas as measured from Earth, indicating Delta Crateris lies at a distance of 163 ± 4 light years from the Sun. This is an evolved orange-hued giant star belonging to the spectral class K0 III. Delta Crateris is a member of the so-called red clump, indicating that it is generating energy through the thermonuclear fusion of helium at its core. The star has an estimated 1.56 times the mass of the Sun but has expanded to times the Sun's radius. The metallicity of the star – what astronomers term the abundance of elements other than hydrogen and helium – is only 33% that of the Sun. It is around 2.89 billion years old with a rotation rate that is too small to measure; the projected rotati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eta Crateris
Eta Crateris, Latinized from η Crateris, is a solitary star in the southern constellation of Crater. It marks the lip of the tilted bowl on the left side in the constellation. Eta Crateris lies in the sky NE of Zeta Crateris and NNW of 31 Crateris, the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris also lies to the right (west) of the bright star Gamma Corvi. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.17. With an annual parallax shift of 12.97 mas as seen from Earth, it is located around 280 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust. The star is receding from the Sun with a radial velocity of +15 km/s. Eta Crateris is an ordinary A-type main sequence star with a stellar classification of A0 V. It is about 2.7 times ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nu Hydrae
Nu Hydrae, Latinized from ν Hydrae, is an orange-hued star in the constellation Hydra, near the border with the neighboring constellation of Crater. It has an apparent visual magnitude of 3.115, which is bright enough to be seen with the naked eye. Based upon parallax measurements, this star is located at a distance of about from the Earth. The spectrum of this star matches a stellar classification of K0/K1 III, where the luminosity class of 'III' indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The radius of this star has expanded to 21 times the Sun's radius with an emission of about 151 times the luminosity of the Sun. This expanded outer envelope has an effective temperature of about 4,335 K, giving it the characteristic orange hue of a K-type star. Nu Hydrae is an X-ray emitter with an estimated luminosity of in the X-ray band. The abundance of elements other than hydrogen an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambda Crateris
Lambda Crateris, Latinized from λ Crateris, is the Bayer designation for a suspected binary star system in the southern constellation of Crater. With an annual parallax shift of 23.32 milliarcsecond as observed from Earth, it is located around 140 light years from the Sun. It is faintly visible to the naked eye with an apparent visual magnitude of 5.08. This is a probable astrometric binary star system, with orbital elements first reported by Abt and Levy (1976). However, Morbey and Griffin (1987) later cast some doubt on the validity of these results, suggesting that further review is needed. The visible member of this system, component A, is an evolved F-type giant star with a stellar classification of F5 III. It has an estimated 1.78 times the mass of the Sun and 2.8 times the Sun's radius. The star is spinning with a projected rotational velocity Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeta Crateris
Zeta Crateris (ζ Crateris) is a probable binary star system in the southern constellation of Crater. Zeta Crateris appears to be about half-way between Epsilon Corvi to the southeast and Beta Crateris to the northwest, and marks the lower left corner of the rim of the bowl. Eta Crateris lies somewhat less than half of the way from Zeta Crateris to Gamma Corvi, the bright star above, (north) of Epsilon Corvi. Zeta Crateris is a photometrically constant system that is visible to the naked eye with an apparent visual magnitude of 4.740. With an annual parallax shift of 9.24 mas as viewed from Earth, Zeta Crateris is located roughly 350 light years from the Sun. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.21 due to interstellar dust. The two components of this system had an angular separation of 0.20 arc seconds along a position angle of 22°, as of 1991. The primary, component A, is a magnitude 4. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Crateris
Gamma Crateris is a binary star system, divisible with a small amateur telescope, and located at the center of the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.06. With an annual parallax shift of 39.62 mas as seen from Earth, this star is located 82.3 light years from the Sun. Based upon the motion of this system through space, it is a potential member of the Castor Moving Group. The star was confirmed by Gabriel Cristian Neagu and Jan Ovidiu Tercu as a variable of DSCT type. The variability has an amplitude of 0.001 magnitudes and a main period of 0.03647 d (52.52 min). The variability was discovered during the datamining activity with the goal of increasing the student's investigative competences. The primary, component A, is a white-hued A-type main sequence star of apparent visual magnitude 4.08 with a stellar classification of A9 V. The star has an estimated 1.81 times the mass of the Sun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
