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NGC Objects
The ''New General Catalogue of Nebulae and Clusters of Stars'' (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae. Dreyer published two supplements to the NGC in 1895 and 1908, known as the ''Index Catalogues'' (abbreviated IC), describing a further 5,386 astronomical objects. Thousands of these objects are best known by their NGC or IC numbers, which remain in widespread use. The NGC expanded and consolidated the cataloguing work of William and Caroline Herschel, and John Herschel's '' General Catalogue of Nebulae and Clusters of Stars''. Objects south of the celestial equator are catalogued somewhat less thoroughly, but many were included based on observation by John Herschel or James Dunlop. The NGC contained multiple errors, but attempts to eliminate them were made by the ''Revised New General Catalogue'' (RNGC) by Jack W. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomical Catalog
An astronomical catalogue is a list or tabulation of astronomical objects, typically grouped together because they share a common type, Galaxy morphological classification, morphology, origin, means of detection, or method of discovery. The oldest and largest are star catalogues. Hundreds have been published, including general ones and special ones for such objects as Infrared astronomy, infrared stars, variable stars, giant stars, multiple star systems, star clusters, and so forth. General catalogues for deep-sky objects or for objects other than stars are also large. Again, there are specialized ones for nebulas, galaxies, X-ray astronomy, X-ray sources, Astronomical radio source, radio sources, quasars and other classes. The same is true for asteroids, comets and other Small Solar System body, solar system bodies. Astronomical catalogues such as those for asteroids may be compiled from multiple sources, but most modern catalogues are the result of a particular astronomical su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press was the university press of the University of Cambridge. Granted a letters patent by King Henry VIII in 1534, it was the oldest university press in the world. Cambridge University Press merged with Cambridge Assessment to form Cambridge University Press and Assessment under Queen Elizabeth II's approval in August 2021. With a global sales presence, publishing hubs, and offices in more than 40 countries, it published over 50,000 titles by authors from over 100 countries. Its publications include more than 420 academic journals, monographs, reference works, school and university textbooks, and English language teaching and learning publications. It also published Bibles, runs a bookshop in Cambridge, sells through Amazon, and has a conference venues business in Cambridge at the Pitt Building and the Sir Geoffrey Cass Sports and Social Centre. It also served as the King's Printer. Cambridge University Press, as part of the University of Cambridge, was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sky Publishing
The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting. The celestial sphere is conventionally divided into designated areas called constellations. Usually, the term ''sky'' informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the ''sky bowl'') appearing flatter during the day than at night. In some cases, such as in discussing the weather, the sky refers to only the lower, denser layers of the atmosphere. The daytime sky appears blue because air molecules scatter sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goddard Space Flight Center
The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C., in Greenbelt, Maryland, United States. Established on May 1, 1959, as NASA's first space flight center, GSFC employs about 10,000 civil servants and contractors. Named for American rocket propulsion pioneer Robert H. Goddard, it is one of ten major NASA field centers. GSFC is partially within the former Goddard, Maryland, Goddard census-designated place; it has a Greenbelt, Maryland, Greenbelt mailing address.CENSUS 2000 BLOCK MAP: GODDARD CDP (PDF). U.S. Census Bureau. Retrieved September 1, 2018. 1990 Census map of Prince George's County [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a celestial body, as they are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NGC 771
50 Cassiopeiae is a white star in the northern constellation of Cassiopeia. In the past, it had been misidentified as a suspected nebula, and given the number NGC 771. The star is visible to the naked eye, having an apparent visual magnitude of +3.95. Based upon an annual parallax shift of , it is located 157 light years away. It is moving closer, having a heliocentric radial velocity of −18 km/s, and will approach to within in 1.879 million years. It is an A-type main-sequence star with a stellar classification of A2 V. It is a suspected variable star with a very small amplitude. 50 Cas has an estimated 2.56 times the mass of the Sun, and about 2.5 times the Sun's radius. It is radiating 64 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 temp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Astronomical History And Heritage
The ''Journal of Astronomical History and Heritage'' is a peer-reviewed academic journal. As of 2021, the journal is published four times per year and is logged through the Astrophysics Data System. It publishes research papers, reviews, short communications, IAU reports, and book reviews on all aspects of astronomical history. The co-editor-in-chief are Wayne Orchiston and Yunli Shi. As of 2024 the associate editors are Clifford Cunningham, Richard de Grijs, Duane Hamacher, James Lequeux, Mohammad Mozaffari, and Peter Robertson. The journal is registered with Scopus and has a 2022 impact factor of 0.94. It was established in 1998 by John Louis Perdrix, after the '' Australian Journal of Astronomy'' was discontinued. Until 2005, it was published by Astral Press, a publishing house founded and owned by Perdrix. From 2005-2012 it was published by the Centre for Astronomy ( James Cook University). From 2013-2021 it was published by the National Astronomical Research Institute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion (constellation)
Orion is a prominent set of stars visible during winter in the northern celestial hemisphere. It is one of the IAU designated constellations, 88 modern constellations; it was among :Constellations listed by Ptolemy, the 48 constellations listed by the 2nd-century astronomer Ptolemy. It is named after Orion (mythology), a hunter in Greek mythology. Orion is most prominent during winter evenings in the Northern Hemisphere, as are five other constellations that have stars in the Winter Hexagon asterism (astronomy), asterism. Orion's two brightest stars, Rigel (β) and Betelgeuse (α), are both among the List of brightest stars, brightest stars in the night sky; both are supergiants and slightly variable star, variable. There are a further six stars brighter than magnitude 3.0, including three making the short straight line of the Orion's Belt asterism (astronomy), asterism. Orion also hosts the radiant (meteor shower), radiant of the annual Orionids, the strongest meteor shower as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reflection Nebula
In astronomy, reflection nebulae are interstellar cloud, clouds of Cosmic dust, interstellar dust which might reflect the light of a nearby star or stars. The energy from the nearby stars is insufficient to Ionization, ionize the gas of the nebula to create an emission nebula, but is enough to give sufficient scattering to make the dust visible. Thus, the frequency spectrum shown by reflection nebulae is similar to that of the illuminating stars. Among the microscopic particles responsible for the scattering are carbon compounds (e. g. diamond dust) and compounds of other elements such as iron and nickel. The latter two are often aligned with the Galaxy#Magnetic fields, galactic magnetic field and cause the scattered light to be slightly Polarization (waves), polarized. Discovery Analyzing the spectrum of the nebula associated with the star Merope (star), Merope in the Pleiades, Vesto Slipher concluded in 1912 that the source of its light is most likely the star itself, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copeland Septet
The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a group of galaxies in the constellation Leo that includes NGC 3748, NGC 3754, NGC 3750, NGC 3751, NGC 3745, NGC 3753 and NGC 3746. The group was discovered by British astronomer Ralph Copeland in 1874. The location of Copeland's Septet is right ascension / declination (2000.0), about three degrees northwest of third magnitude star 93 Leonis. The redshift of the brightest member, NGC 3753 places Copelands Septet as a part of the Coma Supercluster. See also * Wild's Triplet * Zwicky's Triplet * Robert's Quartet Robert's Quartet is a compact galaxy group approximately 160 million light-years away in the constellation Phoenix (constellation), Phoenix. It is a family of four very different galaxies whose proximity to each other has caused the creation of ... * Stephan's Quintet and NGC 7331 Group (also known as the ''Deer Lick Group'' located about half a degree northeast of Stephan's Qui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Arizona Press
The University of Arizona Press, a publishing house founded in 1959 as a department of the University of Arizona, is a nonprofit publisher of scholarly and regional books. As a delegate of the University of Arizona to the larger world, the Press publishes the work of scholars wherever they may be, concentrating upon scholarship that reflects the special strengths of the University of Arizona, Arizona State University, and Northern Arizona University. The Press publishes about fifty books annually and has some 1,400 books in print. These include scholarly titles in American Indian studies, anthropology, archaeology, environmental studies, geography, Chicano studies, history, Latin American studies, and the space sciences. The UA Press has award-winning books in more than 30 subject areas. The UA Press also publishes general interest books on Arizona and the Southwest borderlands. In addition, the Press publishes books of personal essays, such as Nancy Mairs's ''Plaintext'' and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NGC 6543 7662 7009 6826
NGC may refer to: Companies * NGC Corporation, the name of US electric company Dynegy, Inc. from 1995 to 1998 * National Gas Company of Trinidad and Tobago, a state-owned natural gas company in Trinidad and Tobago * National Grid plc, a former name of National Grid Electricity Transmission plc, the operator of the British electricity transmission system * Northrop Grumman Corporation, an aerospace and defense conglomerate formed from the merger of Northrop Corporation and Grumman Corporation in 1994 * Numismatic Guaranty Company, a coin certification company in the United States * National Garden Clubs, headquartered in St. Louis, Missouri * Network General Corporation, a defunct networking hardware company Other uses * National Gallery of Canada, an art gallery founded in 1880 in Ottawa, Canada * National Games of China, the national multi-sport event of China * National Geographic (American TV channel), a documentary and reality television channel established in the United Sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
