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NGC 1893
NGC 1893 is an open cluster in the constellation Auriga. It is about 12,400 light years away. The star cluster is embedded in the HII region IC 410. Images of the star cluster by the Chandra X-ray Observatory suggest that it contains approximately 4600 young stellar objects. References External links * Image NGC 1893* * * * * * {{DEFAULTSORT:NGC 1893 NGC 1893 1893 Events January–March * January 2 – Webb C. Ball introduces railroad chronometers, which become the general railroad timepiece standards in North America. * Mark Twain started writing Puddn'head Wilson. * January 6 – Th ... Auriga (constellation) Star-forming regions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auriga (constellation)
Auriga is a constellation in the northern celestial hemisphere. It is one of the 88 modern constellations; it was among the 48 constellations listed by the 2nd-century astronomer Ptolemy. Its name is Latin for '(the) charioteer', associating it with various mythological beings, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the northern Hemisphere, as are five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far south as -34°; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest, Hydra. Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a instant, 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 Astronomical object, celestial body, as they are subject to Perturbation (astronomy), 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 Perihelion and aphelion, 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 bodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collinder Catalogue
In astronomy, the Collinder catalogue is a catalogue of 471 open clusters by Swedish astronomer Per Collinder. It was published in 1931 as an appendix to Collinder's paper ''On structural properties of open galactic clusters and their spatial distribution''. Catalogue objects are denoted by ''Collinder'', e.g. "Collinder 399". Dated prefixes include as ''Col + catalogue number'', or ''Cr + catalogue number'', e.g. "Cr 399". Vital statistics * The catalogue contains 471 objects: 452 open clusters, 11 globular clusters, 6 Asterism (astronomy), asterisms, 1 Stellar kinematics#Moving groups, stellar moving group, and 1 Stellar kinematics#Stellar associations, stellar association. * Objects are spread out across the entire celestial sphere. * NGC 188, Cr 8 is the northernmost Collinder object, located at a declination of +85º in the constellation Camelopardalis. * Cr 411 is the southernmost Collinder object, located at a declination of -79º in the constellation Octans. Collinder obj ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melotte Catalogue
In astronomy, the Melotte catalogue is a catalogue of 245 star clusters by British astronomer Philibert Jacques Melotte. It was published in 1915 as ''A Catalogue of Star Clusters shown on Franklin-Adams Chart Plates''.Melotte, P. J"A Catalogue of Star Clusters shown on Franklin-Adams Chart Plates" ''MmRAS'', 1915 Catalogue objects are denoted by ''Melotte'', e.g. "Melotte 20". Dated prefixes include as ''Mel + catalogue number'', e.g. "Mel 20". Vital statistics * The catalogue contains 245 objects: 161 open clusters, 81 globular clusters, 2 asterisms, and 1 galaxy. * Objects are spread out across the entire celestial sphere. * Mel 2 is the northernmost Melotte object, located at a declination of +85º in the constellation Cepheus. * Mel 129 is the southernmost Melotte object, located at a declination of -82º in the constellation Apus. Melotte objects which are also Messier objects The Melotte catalogue contains 55 objects which are part of the Messier catalogue: * Messi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Cluster
Star clusters are large groups of stars. Two main types of star clusters can be distinguished: globular clusters are tight groups of ten thousand to millions of old stars which are gravitationally bound, while open clusters are more loosely clustered groups of stars, generally containing fewer than a few hundred members, and are often very young. Open clusters become disrupted over time by the gravitational influence of giant molecular clouds as they move through the galaxy, but cluster members will continue to move in broadly the same direction through space even though they are no longer gravitationally bound; they are then known as a stellar association, sometimes also referred to as a ''moving group''. Star clusters visible to the naked eye include the Pleiades, Hyades, and 47 Tucanae. Open cluster Open clusters are very different from globular clusters. Unlike the spherically distributed globulars, they are confined to the galactic plane, and are almost always found wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lund Observatory
Lund Observatory is the official English name for the astronomy department at Lund University. Between 1867-2001 "Lund Observatory" was also the name of the Observatory building, which is now referred to as the "Lund Old Observatory". As of January 2010, Lund Observatory is part of the Department of Astronomy and Theoretical Physics at Lund University. It is located in Lund, Sweden. History The institution was founded in 1749, but was preceded by an observatory built by astronomy professor Anders Spole (the grandfather of Anders Celsius) in 1672, which was destroyed at the Battle of Lund in 1676. The now old observatory from 1867 is located in a cultural-heritage protected observatory park just outside the medieval city boundaries. The department left these premises in 2001 for a new building on the northern campus of Lund University, inaugurated in 2001, using the nearby old water tower as their new location for astronomical observations. The history of astronomy in Lund thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OCL (astronomical Catalog) , football tournament
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The initialism OCL can have several meanings, depending on context: *OCl−, the hypochlorite ion, in chemistry * Open Content License *Object Constraint Language * IBM Open Class Library * Operational Control Language of IBM mid-range computers *Overseas Containers Limited, former shipping company *OFC Champions League The OFC Champions League, also known as the O-League, is the premier men's club soccer competition in Oceania. It is organised by the OFC, Oceania's football governing body. Beginning as the Oceania Club Championship (1987–2006), it has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raab
Raab is a market town (''Marktgemeinde'') in the district of Schärding in Upper Austria in Austria. History The village historically belonged to the Duchy of Bavaria until the Treaty of Teschen transferred the area to Austria in 1780. During the Napoleonic Wars it was restored to Bavaria until 1814. Ernst Kaltenbrunner spent several formative years growing up in this town before World War I. After the annexation of Austria into the Third Reich on 13 March 1938, the entire region was incorporated into the Gau ''Oberdonau'' (Upper Danube) under SS Standartenführer August Eigruber August Eigruber (16 April 1907 – 28 May 1947) was an Austrian-born Nazi Gauleiter and ''Reichsstatthalter'' of Reichsgau Oberdonau (Upper Danube) and Landeshauptmann of Upper Austria. He was convicted of war crimes at Mauthausen-Gusen conce ... until 1945. Joseph Plowman (1857–1929), Titular Archbishop, Auxiliary Bishop and Vicar General in Vienna, and Alois Jungwirth (1884–1946), Member ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Open Cluster
An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and many more are thought to exist. They are loosely bound by mutual gravity, gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the Galactic Center. This can result in a migration to the main body of the galaxy and a loss of cluster members through internal close encounters. Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral galaxy, spiral and irregular galaxy, irregular galaxies, in which active star formation is o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HII Region
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized. It is typically in a molecular cloud of partially ionized gas in which star formation has recently taken place, with a size ranging from one to hundreds of light years, and density from a few to about a million particles per cubic centimetre. The Orion Nebula, now known to be an H II region, was observed in 1610 by Nicolas-Claude Fabri de Peiresc by telescope, the first such object discovered. The regions may be of any shape because the distribution of the stars and gas inside them is irregular. Hertzsprung-Russell diagram, The short-lived blue stars created in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. They often appear clumpy and filamentary, sometimes showing intricate shapes such as the Horsehead Nebula. H II regio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chandra X-ray Observatory
The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a Flagship-class space telescope launched aboard the during STS-93 by NASA on July 23, 1999. Chandra is sensitive to X-ray sources 100 times fainter than any previous X-ray telescope, enabled by the high angular resolution of its mirrors. Since the Earth's atmosphere absorbs the vast majority of X-rays, they are not detectable from Earth-based telescopes; therefore space-based telescopes are required to make these observations. Chandra is an Earth satellite in a 64-hour orbit, and its mission is ongoing . Chandra is one of the Great Observatories, along with the Hubble Space Telescope, Compton Gamma Ray Observatory (1991–2000), and the Spitzer Space Telescope (2003–2020). The telescope is named after the Nobel Prize-winning Indian-American astrophysicist Subrahmanyan Chandrasekhar. Its mission is similar to that of ESA's XMM-Newton spacecraft, also launched in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
