|
Themis Family
The Themis family (''adj. Themistian''; ) is a Asteroid family, family of carbonaceous asteroids located in the Kirkwood gap, outer portion of the asteroid belt, at a mean distance of 3.13 Astronomical Unit, AU from the Sun. It is one of the Asteroid family#All families, largest families with over 4700 known members, and consists of a well-defined core of larger bodies surrounded by a region of smaller ones. The Collisional family, collisional Themis family is named after its parent body, the asteroid 24 Themis, discovered on 5 April 1853 by Italian astronomer Annibale de Gasparis. Description The Themis family is one of the largest and longest-recognized dynamical families of asteroids, and is made up of C-type asteroids with a composition believed to be similar to that of carbonaceous chondrites. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family Identification Number
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity (orbit), eccentricity, and orbital inclination. The members of the families are thought to be Collisional family, fragments of past asteroid collisions. An asteroid family is a more specific term than list of minor-planet groups, asteroid group whose members, while sharing some broad orbital characteristics, may be otherwise unrelated to each other. General properties Large prominent families contain several hundred recognized asteroids (and many more smaller objects which may be either not-yet-analyzed, or not-yet-discovered). Small, compact families may have only about ten identified members. About 33% to 35% of asteroids in the main belt are family members. There are about 20 to 30 reliably recognized families, with several tens of less certain groupings. Most asteroid families are found in the main belt, main asteroid belt, although several famil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
171 Ophelia
Ophelia (minor planet designation: 171 Ophelia) is a large, dark Themistian asteroid that was discovered by French astronomer Alphonse Borrelly on 13 January 1877, and named after Ophelia in Shakespeare's ''Hamlet''. This asteroid is a member of the Themis family of asteroids that share similar orbital elements. It probably has a primitive composition, similar to that of the carbonaceous chondrite meteorites. A 1979 study of the Algol-like light curve produced by this asteroid concluded that it was possible to model the brightness variation by assuming a binary system with a circular orbit, a period of 13.146 hours, and an inclination of 15° to the line of sight from the Earth. Photometric observations of this asteroid at the Leura Observatory in Leura, Australia during 2006 gave a rotation period of 6.6666 ± 0.0002 hours and a brightness variation of 0.50 ± 0.02 in magnitude. This is in agreement with previous studies. Ophelia is also the name of a moon of Uranus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icarus (journal)
''ICARUS'' is a scientific journal dedicated to the field of planetary science. It is officially endorsed by the American Astronomical Society's Division for Planetary Sciences (DPS). The journal contains articles discussing the results of new research on astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of the Solar System or extrasolar systems. The journal was founded in 1962, and became affiliated with the DPS in 1974. Its original owner and publisher was Academic Press, which was purchased by Elsevier in 2000. The journal is named for the mythical Icarus, and the frontispiece of every issue contains an extended quotation from Sir Arthur Eddington equating Icarus' adventurousness with the scientific investigator who "strains his theories to the breaking-point till the weak joints gape." Abstracting and indexing This journal is indexed by the following services: * Science Citation Index * Current Contents /Physical, Chemical & E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hirayama Family
A Hirayama family of asteroids is a group of minor planets that share similar orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. Strictly speaking, families and their membership are identified by analysing the so-called proper orbital elements rather than the current osculating orbital elements, which regularly fluctuate on timescales of tens of thousands of years. The ''proper elements'' are related constants of motion that are thought to remain almost constant for times of at least tens of millions of years. The Japanese astronomer Kiyotsugu Hirayama (1874–1943) pioneered the estimation of proper elements for asteroids, and first identified several of the most prominent families in 1918. Kiyotsugu Hirayama initially identified the Koronis, Eos, and Themis families, and later recognized also the Flora and Maria Maria may refer to: People * Mary, mother ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
846 Lipperta
846 Lipperta is a Themistian asteroid. Based on lightcurve studies, Lipperta has a rotation period of 1641 hours, but this figure is based on less than full coverage, so that the period may be wrong by 30 percent or so. The lack of variation in brightness could be caused by (a) very slow rotation, (b) near pole-on viewing aspect, or (c) a spherical body with uniform albedo Albedo (; ) is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that refl .... References External links * * 000846 Discoveries by K. Gyllenberg Named minor planets 000846 000846 19161126 {{C-beltasteroid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
767 Bondia
767 Bondia ('' prov. designation:'' ''or'' ) is a Themis asteroid from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 23 September 1913, by American astronomer Joel Hastings Metcalf at his observatory in Winchester, Massachusetts. The B-type asteroid has a rotation period of 8.3 hours. It was named after William Cranch Bond (1789–1859) and his son George Phillips Bond (1825–1865), both American astronomers and directors of the Harvard College Observatory in Cambridge, Massachusetts. Orbit and classification ''Bondia'' is a core member the Themis family (), a very large family of carbonaceous asteroids, named after 24 Themis. It orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 6 months (2,015 days; semi-major axis of 3.12 AU). Its orbit has an eccentricity of 0.18 and an inclination of 2 ° with respect to the ecliptic. The Themistian asteroid was first observed as () at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
526 Jena
Jena (minor planet designation: 526 Jena) is a Themistian asteroid. It was discovered in Heidelberg by the German astronomer Max Wolf on 14 March 1904 and named after the city of Jena. References External links * * Themis asteroids Jena Jena Jena () is a German city and the second largest city in Thuringia. Together with the nearby cities of Erfurt and Weimar, it forms the central metropolitan area of Thuringia with approximately 500,000 inhabitants, while the city itself has a popu ... B-type asteroids (Tholen) 19040314 {{C-beltasteroid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
515 Athalia
Athalia (minor planet designation: 515 Athalia), provisional designation , is a carbonaceous Themistian asteroid from the outer regions of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 20 September 1903, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany. The asteroid was named after the ancient Judahite queen Athaliah. Orbit and classification ''Athalia'' is a Themistian asteroid that belongs to the Themis family (), a very large family of carbonaceous asteroids, named after 24 Themis Themis ( minor planet designation: 24 Themis) is one of the largest asteroids in the asteroid belt. It is also the largest member of the Themistian family. It was discovered by Annibale de Gasparis on 5 April 1853. It is named after Themis, th .... It orbits the Sun in the Kirkwood gap, outer main belt at a distance of 2.6–3.7 Astronomical unit, AU once every 5 years and 6 months (2,016 days). Its orbit has an orbital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
492 Gismonda
Gismonda (minor planet designation: 492 Gismonda) is a Themistian asteroid discovered by Max Wolf. Gismonda is named after the daughter of Tancred, prince of Salerno, from Giovanni Boccaccio's work, The Decameron ''The Decameron'' (; it, label=Italian, Decameron or ''Decamerone'' ), subtitled ''Prince Galehaut'' (Old it, Prencipe Galeotto, links=no ) and sometimes nicknamed ''l'Umana commedia'' ("the Human comedy", as it was Boccaccio that dubbed Dan .... References External links Lightcurve plot of (492) Gismonda Antelope Hills Observatory * * 000492 Discoveries by Max Wolf Named minor planets 19020903 {{C-beltasteroid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
468 Lina
Lina (minor planet designation: 468 Lina), provisional designation ', is a dark Themistian asteroid from the outer region of the asteroid belt, approximately in diameter. It was discovered on 18 January 1901, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany. The carbonaceous asteroid was named for the housemaid of the discoverer's family. Classification and orbit ''Lina'' is a core member of the Themis family, an ancient population of carbonaceous outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.5–3.8 AU once every 5 years and 6 months (2,025 days). Its orbit has an eccentricity of 0.20 and an inclination of 0.4 ° with respect to the ecliptic. ''Lina'' was first observed at Heidelberg a few days prior to its official discovery observation. The body's observation arc begins with its identification as ' at Heidelberg in 1915, or 14 years after its official discovery observation. Naming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
383 Janina
Janina (minor planet designation: 383 Janina) is a Themistian asteroid, approximately in diameter. It is spectral B-type and is probably composed of primitive carbonaceous chondritic material. It was discovered by Auguste Charlois on 29 January 1894 in Nice. The reference of the name is unknown, though it is the French name of Ioannina Ioannina ( el, Ιωάννινα ' ), often called Yannena ( ' ) within Greece, is the capital and largest city of the Ioannina regional unit and of Epirus, an administrative region in north-western Greece. According to the 2011 census, the c ... in Greece, as well as a common German woman's name, both of which probably descend from ''Johannes''. References External links * * {{DEFAULTSORT:Janina 000383 Discoveries by Auguste Charlois Named minor planets 000383 000383 18940129 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
379 Huenna
Huenna (minor planet designation: 379 Huenna) is a large asteroid orbiting in the asteroid belt. It is part of the Themis family, and thus a C-type asteroid and consequently composed mainly of carbonaceous material. It was discovered by Auguste Charlois on 8 January 1894 in Nice. It is the Latin name for the Swedish island of Ven, the site of two observatories. This island is where Tycho Brahe built his observatory. A satellite, 7 km across and designated S/2003 (379) 1, was discovered on 14 August 2003 by Jean-Luc Margot using the Keck II adaptive optics telescope at Mauna Kea. The moon orbits 3400±11 km away in 80.8±0.36 d with an eccentricity of 0.334±0.075. The system is loosely bound as Huenna has a Hill sphere The Hill sphere of an astronomical body is the region in which it dominates the attraction of satellites. To be retained by a planet, a moon must have an orbit that lies within the planet's Hill sphere. That moon would, in turn, have a Hill sp ... w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
