|
Orion OB1
Orion OB1 (Ori OB1) is a contingent group of several dozen hot giant stars of spectral types O and B in Orion. Associated are thousands of lower-mass stars, and a (smaller but significant) number of protostars. It is part of the larger Orion molecular cloud complex. Owing to its relative closeness and complexity it is the most closely studied OB association. The Orion OB1 consists of the following subgroups: *Orion OB1a - the group of stars northwest of the Orion Belt stars with an average age of about 12 million years. Within this grouping is another subgroup known as the 25 Orionis group. They are located near the star of Bellatrix. *Orion OB1b - the three bright stars ζ Ori (Alnitak), ε Ori (Alnilam), and δ Ori (Mintaka) which make up the asterism known as "Orion's Belt", and minor stars. This group has an average age of approximately 8 million years and is further subdivided into three subgroups. *Orion OB1c - the stars in Orion's Sword that are created by 42 Orion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion OB1 & 25 Ori Group
Orion () may refer to: Common meanings * Orion (constellation), named after the mythical hunter * Orion (mythology), a hunter in Greek mythology * Orion (spacecraft), NASA crew vehicle first launched in 2022 Arts and media Fictional entities Characters and species * Orion (character), a DC Comics character * Orion (''Star Trek''), a sentient alien species * Orion, code name of Stephen J. Bartowski on the television show ''Chuck'' * Orion, in the fighting game ''Brawlhalla'' * Orions, a race in the '' Starfire'' board game and book series * Orion, a character from ''Power Rangers Super Megaforce'' * Captain Orion, in the Japanese series '' X-Bomber'' Vessels * ''Orion'', a spaceplane in the film ''2001: A Space Odyssey'' * ''Orion'', a spaceship in '' Raumpatrouille Orion'' (''Space Patrol Orion'' in English), the first German science fiction television series * ''"Orion"''-class spaceship, on the television series '' Ascension'' Literature * ''Orion'', an 184 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterism (astronomy)
An asterism is an observed pattern or group of stars in the sky. Asterisms can be any identified pattern or group of stars, and therefore are a more general concept than the formally defined 88 constellations. Constellations are based on asterisms, but unlike asterisms, constellations outline and today completely divide the sky and all its celestial objects into regions around their central asterisms. For example, the asterism known as the Big Dipper comprises the seven brightest stars in the constellation Ursa Major. Another is the asterism of the Southern Cross, within the constellation of Crux. Asterisms range from simple shapes of just a few stars to more complex collections of many stars covering large portions of the sky. The stars themselves may be bright naked-eye objects or fainter, even telescopic, but they are generally all of a similar brightness to each other. The larger brighter asterisms are useful for people who are familiarizing themselves with the night sky. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuria Calvet
Núria Pilar Calvet Cuni (born 1950) is a Venezuelan astronomer who studies star formation and the evolution of protoplanetary disks around young stars. She is Helen Dodson Prince Collegiate Professor of Astronomy at the University of Michigan. She was the first woman to work as a professional astronomer in Venezuela. Education and career Calvet was born in Caracas in 1950. After study at the Central University of Venezuela, she earned a bachelor's degree from the National Autonomous University of Mexico in 1973. She continued her studies at the University of California, Berkeley, earning a master's degree in 1975 and completing her Ph.D. in 1981. Her dissertation was ''Model atmospheres for T Tauri stars''. She worked for the Centro de Investigaciones de Astronomia in Venezuela from 1981 to 1997, becoming vice president of the center. Next, she became an astronomer at the Harvard–Smithsonian Center for Astrophysics. She moved to her present position at the University of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Debris Disk
A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star. Sometimes these disks contain prominent rings, as seen in the image of Fomalhaut on the right. Debris disks are found around stars with mature planetary systems, including at least one debris disk in orbit around an evolved neutron star. Debris disks can also be produced and maintained as the remnants of collisions between planetesimals, otherwise known as asteroids and comets. By 2001, more than 900 candidate stars had been found to possess a debris disk. They are usually discovered by examining the star system in infrared light and looking for an excess of radiation beyond that emitted by the star. This excess is inferred to be radiation from the star that has been absorbed by the dust in the disk, then re-radiated away as infrared energy. Debris disks are often described as massive analogs to the debris in the Solar System. Most known de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M43 (nebula)
Messier 43 or M43, also known as De Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion. It was discovered by the French scientist Jean-Jacques Dortous de Mairan some time before 1731, then catalogued by Charles Messier in 1769. It is physically part of the Orion Nebula (Messier 42), separate from that main nebula by a dense lane of dust known as the northeast dark lane. It is part of the much larger Orion molecular cloud complex. The main ionizing star in this nebula is HD 37061 (variable star designation NU Ori), the focus of the H II region, away. This is a triple star system with the brighter component being a single-lined spectroscopic binary. The main component is a blue-white hued B-type main-sequence star with a stellar classification of B0.5V or B1V. It has times the mass of the Sun () and times the Sun's radius (). It is radiating over 26,000 times the Sun's luminosity () from its photo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion Nebula
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion. It is one of the brightest nebulae and is visible to the naked eye in the night sky with apparent magnitude 4.0. It is away and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light-years across (so its apparent size from Earth is approximately 1 degree). It has a mass of about 2,000 times that of the Sun. Older texts frequently refer to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula. The Orion Nebula is one of the most scrutinized and photographed objects in the night sky and is among the most intensely studied celestial features.Press release,Astronomers Spot The Great Orion Nebula's Successor", Harvard-Smithsonian Center for Astrophysics, 2006. The nebula has revealed much about the process of how stars and planetary systems are form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ι Orionis
Iota Orionis (ι Orionis, abbreviated ι Ori) is a multiple star system in the equatorial constellation of Orion the hunter. It is the eighth-brightest member of Orion with an apparent visual magnitude of 2.77 and also the brightest member of the asterism known as Orion's Sword. It is a member of the NGC 1980 open cluster. From parallax measurements, it is located at a distance of roughly from the Sun. The system has three visible components designated Iota Orionis A, B and C. Iota Orionis A has also been resolved using speckle interferometry and is also a massive spectroscopic binary, with components Iota Orionis Aa1 (officially named Hatysa ), Aa2, and Ab. Nomenclature ''ι Orionis'' ( Latinised to ''Iota Orionis'') is the system's Bayer designation. The designations of the three constituents as ''Iota Orionis A'', ''B'' and ''C'', and those of ''A's'' components - ''Iota Orionis Aa1'', ''Aa2'', and ''Ab'' - derive from the convention used by the Washington Mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
θ Orionis
The Bayer designation θ Orionis (Theta Orionis) is shared by several astronomical objects, located near RA DEC : * θ1 Orionis (41 Orionis), the Trapezium Cluster, an open star cluster, the ''Orion OB Association 1d'' ** θ1 Orionis A (41 Orionis A, HD 37020, V1016 Orionis), a trinary star system ** θ1 Orionis B (41 Orionis B, HD 37021), a quintet star system *** θ1 Orionis B West (COUP 766, MAX 97), an astronomical X-ray source *** θ1 Orionis B East (COUP 778, MAX 101), an astronomical X-ray source ** θ1 Orionis C (41 Orionis C, HD 37022), a binary star system ** θ1 Orionis D (41 Orionis D, HD 37023), a B0.5Vp variable star ** θ1 Orionis E (COUP 732), a spectroscopic binary star system ** θ1 Orionis F, a B8 variable star at 11th magnitude ** θ1 Orionis G (COUP 826, MAX 116), a young stellar object ** θ1 Orionis H (COUP 746, MAX 87), a young stellar object * θ2 Orionis (43 Orionis) ** θ2 Orionis A (43 Orionis, HD 37041), a spectroscopic trinary ** θ2 Orionis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
42 Orionis
42 Orionis is a class B1V (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59 and it is approximately 900 light years away based on parallax. The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16", and a more distant companion B of 7.5 magnitude at 1.6" separation. c Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. c Ori is the star which excites and illuminates NGC 1977. References {{DEFAULTSORT:42 Orionis Orion (constellation) B-type main-sequence stars Orionis, c BD-04 1185 Orionis, 42 026237 1892 Events January–March * January 1 – Ellis Island begins accommodating immigrants to the United States. * February 1 - The historic Enterprise Bar and Grill was established in Rico, Colorado. * February 27 – Rudolf Diesel applies for ... 037018 Suspected variables ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion's Sword
Orion's Sword is a compact asterism in the constellation Orion. It comprises three stars (42 Orionis, Theta Orionis, and Iota Orionis) and M42, the Orion Nebula, which together are thought to resemble a sword or its scabbard. This group is south of the prominent asterism, Orion's Belt. Fables and old beliefs are in Europe dominated or widely influenced by those of the Greco-Roman narratives. Beyond Europe this grouping is quite widely referenced as a weapon just as the majority of cultures perceived Orion's standout asymmetrical "hourglass" of seven very bright stars as a human. Components Orion Nebula The Orion Nebula consists of one of the nearest (thus in the Milky Way Galaxy), massive molecular clouds (30 - 40 light years in diameter) about 1,300 light years from the solar system. This makes the nebula potentially the closest HII region to Earth, a mass of hydrogen that has been ionized by nearby, hot, young stars. Regions like this are called stellar nurseries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta Orionis
Mintaka , designation Delta Orionis (δ Orionis, abbreviated Delta Ori, δ Ori) and 34 Orionis (34 Ori), is a multiple star system some 1,200 light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's Belt, known by many names among ancient cultures. The star is located very close to the celestial equator. When Orion is near the meridian, Mintaka is the rightmost of the Belt's stars when viewed from the Northern Hemisphere facing south. Nomenclature ''Delta Orionis'' is the star's Bayer designation, ''34 Orionis'' its Flamsteed designation. The name ''Mintaka'' itself is derived from an Arabic term for 'belt': منطقة or ''maná¹aqa''. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion (constellation)
Orion is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous and recognizable constellations in the night sky. It is named after Orion (mythology), Orion, a hunter in Greek mythology. Its brightest stars are the blue-white Rigel (Beta Orionis) and the red Betelgeuse (Alpha Orionis). Characteristics Orion is bordered by Taurus to the northwest, Eridanus to the southwest, Lepus to the south, Monoceros (constellation), Monoceros to the east, and Gemini to the northeast. Covering 594 square degrees, Orion ranks twenty-sixth of the 88 constellations in size. The constellation boundaries, as set by Belgian astronomer Eugène Joseph Delporte, Eugène Delporte in 1930, are defined by a polygon of 26 sides. In the equatorial coordinate system, the right ascension coordinates of these borders lie between and , while the declination coordinates are between and . The constellation's three-letter abbreviation, as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
