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KS Persei
KS Persei is a binary system in the equatorial constellation of Perseus. It is sometimes known as Bidelman's Star, named after William P. Bidelman. The star is invisible to the naked eye with a mean apparent visual magnitude of 7.70. As of 2018, the structure and evolutionary history of this system remain uncertain, although some form of mass transfer is likely to have occurred to explain the observed properties. The peculiar nature of the spectra for this star was noted in the '' Henry Draper Catalogue'' and was the subject of a study by W. P. Bidelman published in 1950. He found extremely weak lines of hydrogen, similar to those for Upsilon Sagittarii but at a lower temperature. The data strongly suggested the star has an abnormally low abundance of hydrogen in the stellar atmosphere. Bidelman noted that the radial velocity of the star is variable, demonstrating that it has an unseen companion. Preliminary orbital elements for this single-lined spectroscopic binary were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perseus (constellation)
Perseus is a constellation in the northern sky, being named after the Greek mythological hero Perseus. It is one of the 48 ancient constellations listed by the 2nd-century astronomer Ptolemy, and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located near several other constellations named after ancient Greek legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding the disembodied head of Medusa, whose asterism was named together as ''Perseus et Caput Medusae''; however, this never came into popular usage. The galactic plane of the Milky Way passes through Perseus, whose brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbital Period
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars. For celestial objects in general, the sidereal period ( sidereal year) is referred to by the orbital period, determined by a 360° revolution of one body around its primary, e.g. Earth around the Sun, relative to the fixed stars projected in the sky. Orbital periods can be defined in several ways. The tropical period is more particularly about the position of the parent star. It is the basis for the solar year, and respectively the calendar year. The synodic period incorporates not only the orbital relation to the parent star, but also to other celestial objects, making it not a mere different approach to the orbit of an object around its parent, but a period of orbital relations wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Ultraviolet Explorer
International Ultraviolet Explorer (IUE or Explorer 57, formerly SAS-D), was the first space observatory primarily designed to take ultraviolet (UV) electromagnetic spectrum. The satellite was a collaborative project between NASA, the United Kingdom's Science and Engineering Research Council (SERC, formerly UKSRC) and the European Space Agency (ESA), formerly European Space Research Organisation (ESRO). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on 26 January 1978 aboard a NASA Thor-Delta 2914 launch vehicle. The mission lifetime was initially set for 3 years, but in the end it lasted 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency. It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detlef Schönberner
Detlef is a given name of German origin. It is also spelled Detlev. People with this name Notable people with this name include: *Detlef Bothe (born 1957), East German sprint canoeist *Detlef Bothe (born 1965), German actor *Detlef Bruckhoff (born 1958), retired German footballer *Detlef Enge (born 1952), former East German football player *Detlef Gerstenberg (1957–1993), East German hammer thrower *Detlef Gromoll (1938–2008), German mathematician *Detlef Grumbach (born 1955), German author and journalist *Detlef Hofmann (born 1963), German sprint canoeist *Detlef Kästner (born 1958), East German boxer *Detlef Kübeck (born 1956), retired East German sprinter *Detlef Kirchhoff (born 1967), German rower * Detlef Kraus (1919–2008), German pianist *Detlef Laugwitz (1932–2000), German mathematician *Detlef Lewe (1939–2008), West German sprint canoeist * Detlef Lienau (1818–1887), German architect born in Denmark *Detlef Lohse (born 1963), German fluid mechanics researcher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Scott Drilling
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graham Percy Henry Willingale
Graham and Graeme may refer to: People * Graham (given name), an English-language given name * Graham (surname), an English-language surname * Graeme (surname), an English-language surname * Graham (musician) (born 1979), Burmese singer * Clan Graham, a Scottish clan * Graham baronets Fictional characters * Graham Aker, in the anime ''Gundam 00'' * Project Graham, what a human would look like to survive a car crash Places Canada * Graham, Sudbury District, Ontario * Graham Island, part of the Charlotte Island group in British Columbia * Graham Island (Nunavut), Arctic island in Nunavut United States * Graham, Alabama * Graham, Arizona * Graham, Florida * Graham, Georgia * Graham, Daviess County, Indiana * Graham, Fountain County, Indiana * Graham, Kentucky * Graham, Missouri * Graham, North Carolina * Graham, Oklahoma * Graham, Texas * Graham, Washington Elsewhere * Graham Land, Antarctica * Graham Island (Mediterranean Sea), British name for a submerged volcan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith Morrison (astronomer)
Keith Morrison (born July 2, 1947) is a Canadian broadcast journalist. Since 1995, he has been a correspondent for '' Dateline NBC''. Career Beginning his career in the 1960s, Morrison was a reporter and anchor at local stations in Saskatchewan, Vancouver, British Columbia, and Toronto, Ontario. He joined CTV's '' Canada AM'' in 1973 as a newsreader and also worked as a reporter and weekend anchor as well as a producer. As a reporter at CTV, he won awards for his coverage of the Yom Kippur War. From 1975 to 1976, he was a reporter on ''CTV National News'' and served as National Affairs Correspondent and substitute anchor on the show from 1976 to 1979. Morrison joined the Canadian Broadcasting Corporation in 1982 as substitute anchor and Chief Political Correspondent for '' The Journal'', the network's nightly public affairs program, remaining until 1986. He also co-hosted '' Midday'', the network's noon-hour newsmagazine that he helped to create, from 1984 to 1985. He ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photometry (astronomy)
Photometry, from Greek '' photo-'' ("light") and '' -metry'' ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. This light is measured through a telescope using a photometer, often made using electronic devices such as a CCD photometer or a photoelectric photometer that converts light into an electric current by the photoelectric effect. When calibrated against standard stars (or other light sources) of known intensity and colour, photometers can measure the brightness or apparent magnitude of celestial objects. The methods used to perform photometry depend on the wavelength region under study. At its most basic, photometry is conducted by gathering light and passing it through specialized photometric optical bandpass filters, and then capturing and recording the light energy with a photosensitive instrument. Standard sets of passbands (called a photometric system) are defined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gáspár Á
Gáspár is a Hungarian masculine given name, equivalent to English Jasper, and may refer to: *Gáspár Bekes (1520–1579), Hungarian nobleman *Gáspár Boldizsár (fl. 1990s), Hungarian sprint canoer *Gáspár Borbás (1884–1976), Hungarian footballer *Gáspár Csere (born 1991), Hungarian long distance and marathon runner *Gáspár Heltai (c. 1490–1574), Transylvanian Saxon writer and printer * Gáspár Károli (c. 1529–1591), Hungarian Calvinist pastor *Gáspár Nagy (1949-2007), Hungarian poet and writer *Gáspár Orbán (born 1992), Hungarian religious leader and footballer *Gáspár Miklós Tamás Gáspár Miklós Tamás (''G. M. Tamás''; hu, Tamás Gáspár Miklós; born 28 November 1948), often referred to in the media as TGM, is a Hungarian marxism, marxist-Anarcho-syndicalism, anarcho-syndicalist philosopher and public intellectual ... (born 1948), Hungarian philosopher and intellectual References {{DEFAULTSORT:Gaspar Hungarian masculine given names< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CNO Cycle
The CNO cycle (for carbon–nitrogen–oxygen; sometimes called Bethe–Weizsäcker cycle after Hans Albrecht Bethe and Carl Friedrich von Weizsäcker) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain reaction (p–p cycle), which is more efficient at the Sun's core temperature. The CNO cycle is hypothesized to be dominant in stars that are more than 1.3 times as massive as the Sun. Unlike the proton-proton reaction, which consumes all its constituents, the CNO cycle is a catalytic cycle. In the CNO cycle, four protons fuse, using carbon, nitrogen, and oxygen isotopes as catalysts, each of which is consumed at one step of the CNO cycle, but re-generated in a later step. The end product is one alpha particle (a stable helium nucleus), two positrons, and two electron neutrinos. There are various alternative paths and catalysts involved in the CNO cycles, all these cycles have the sam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Wallerstein
George Wallerstein (January 13, 1930 – May 13, 2021) was a United States astronomer who researched the chemical composition of stellar atmospheres. The son of German immigrants, he was raised in New York City during the Great Depression. In school he developed an interest in boxing and won the senior class boxing award. He graduated from Brown University in 1951 before receiving his M.S. and Ph.D. from the California Institute of Technology. He served in the Navy during the Korean War, then, after teaching at the University of California, joined the astronomy department of the University of Washington in 1965. In March 1998, he retired from the University and was appointed Professor Emeritus. At the time of his death, he was married to the astronomer Julie Lutz. In 2002, he won the Henry Norris Russell Lectureship. In 2004, he was presented the President's Award by the United Negro College Fund for his contributions to diversity. He served on the Board of Directors for the NAA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 of celestial objects on the sky. This permitted the first high-precision measurements of the intrinsic brightnesses (compared to the less precise apparent brightness), proper motions, and parallaxes of stars, enabling better calculations of their distance and tangential velocity. When combined with radial velocity measurements from spectroscopy, astrophysicists were able to finally measure all six quantities needed to determine the motion of stars. The resulting ''Hipparcos Catalogue'', a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision ''Tycho Catalogue'' of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. ''Hipparcos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
