|
19 Fortuna
19 Fortuna is one of the largest main-belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds, including tholins. Fortuna is 225 km in diameter and has one of the darkest known geometric albedos for an asteroid over 150 km in diameter. Its albedo has been measured at 0.028 and 0.037. The spectra of the asteroid displays evidence of aqueous alteration. The Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 arcseconds (4.5 pixels in the Planetary Camera) and its shape was found to be nearly spherical. Satellites were searched for but none were detected. Stellar occultations by Fortuna have been observed several times. Fortuna has been studied by radar. It was discovered by J. R. Hind on 22 August 1852, and named after Fortuna, the Roman goddess of luck. Its historical symbol was a star over Fortune's wheel; i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fortuna Symbol (bold)
Fortuna (, equivalent to the Greek mythology, Greek goddess Tyche) is the goddess of fortune and the personification of luck in Religion in ancient Rome, Roman religion who, largely thanks to the Late Antique author Boethius, remained popular through the Middle Ages until at least the Renaissance. The blindfolded depiction of her is still an important figure in many aspects of today's Italian culture, where the dichotomy ''fortuna / sfortuna'' (luck / unluck) plays a prominent role in everyday social life, also represented by the very common refrain "La [dea] fortuna è cieca" (latin ''Fortuna caeca est''; "Luck [goddess] is blind"). Fortuna is often depicted with a Gubernaculum (classical), gubernaculum (ship's rudder), a ball or Rota Fortunae (wheel of fortune, first mentioned by Cicero) and a cornucopia (horn of plenty). She might bring good or bad luck: she could be represented as veiled and blind, as in modern depictions of Lady Justice, except that Fortuna does not hold a ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcsecond
A minute of arc, arcminute (abbreviated as arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of a degree. Since one degree is of a turn, or complete rotation, one arcminute is of a turn. The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth's circumference is very near . A minute of arc is of a radian. A second of arc, arcsecond (abbreviated as arcsec), or arc second, denoted by the symbol , is a unit of angular measurement equal to of a minute of arc, of a degree, of a turn, and (about ) of a radian. These units originated in Babylonian astronomy as sexagesimal (base 60) subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying, and marksmanship. To express even smaller angles, standard SI prefixes can be employed; the milliarcse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
687 Tinette
687 Tinette is a minor planet, specifically an asteroid orbiting primarily in the asteroid belt. It was discovered by Austrian astronomer Johann Palisa on 16 August 1909 from Vienna and was given the preliminary designation 1909 HG. Photometric observations at the Palmer Divide Observatory in Colorado Springs, Colorado, in 1999 were used to build a light curve for this object. The asteroid displayed a rotation period of 7.40 ± 0.02 hours and a brightness variation of 0.25 ± 0.01 in magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of .... References External links Lightcurve plot of 687 Tinette Palmer Divide Observatory, '' B. D. Warner'' (1999) Asteroid Lightcurve Database (LCDB) query form) Dictionary of Minor Planet Names Google books – Observatoire de Genève, R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
135 Hertha
135 Hertha is an asteroid from the inner region of the asteroid belt, approximately in diameter. Discovered on 18 February 1874 by German–American astronomer Christian Peters at the Litchfield Observatory near Clinton, New York, it was named after the Teutonic and Scandinavian goddess of fertility, Hertha, also known as Nerthus. It orbits among the Nysa asteroid family, but its classification as a metallic M-type asteroid does not match the more common F-type asteroid for this family, suggesting that it may be an interloper. Spectroscopic analysis indicates the possible presence of hydrated silicates indicating that ''Hertha'' should possibly be reclassified from its present M-type to the proposed W-type. Lightcurve data from ''Hertha'' indicates a flattened body, and radar observations indicate that ''Hertha'' is non-metallic. Five occultations of stars by the asteroid have been observed between 2000 and 2015. Discovery ''Hertha'' was discovered by C. H. F. Peters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perturbation (astronomy)
In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body. The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body. Introduction The study of perturbations began with the first attempts to predict planetary motions in the sky. In ancient times the causes were unknown. Isaac Newton, at the time he formulated his laws of motion and of gravitation, applied them to the first analysis of perturbations, recognizing the complex difficulties of their calculation. Many of the great mathematicians since then have given attention to the various problems involved; throughout the 18th and 19th centuries there was demand for accurate tables of the position of the Moon and planets for marine navigation. The complex motions of gravitational perturbations can be broken down. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fortuna Symbol (fixed Width)
Fortuna (, equivalent to the Greek goddess Tyche) is the goddess of fortune and the personification of luck in Roman religion who, largely thanks to the Late Antique author Boethius, remained popular through the Middle Ages until at least the Renaissance. The blindfolded depiction of her is still an important figure in many aspects of today's Italian culture, where the dichotomy ''fortuna / sfortuna'' (luck / unluck) plays a prominent role in everyday social life, also represented by the very common refrain "La eafortuna è cieca" (latin ''Fortuna caeca est''; "Luck oddessis blind"). Fortuna is often depicted with a gubernaculum (ship's rudder), a ball or Rota Fortunae (wheel of fortune, first mentioned by Cicero) and a cornucopia (horn of plenty). She might bring good or bad luck: she could be represented as veiled and blind, as in modern depictions of Lady Justice, except that Fortuna does not hold a balance. Fortuna came to represent life's capriciousness. She was also a godd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unicode
Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Character (computing), characters and 168 script (Unicode), scripts used in various ordinary, literary, academic, and technical contexts. Unicode has largely supplanted the previous environment of a myriad of incompatible character sets used within different locales and on different computer architectures. The entire repertoire of these sets, plus many additional characters, were merged into the single Unicode set. Unicode is used to encode the vast majority of text on the Internet, including most web pages, and relevant Unicode support has become a common consideration in contemporary software development. Unicode is ultimately capable of encoding more than 1.1 million characters. The Unicode character repertoire is synchronized with Univers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luck
Luck is the phenomenon and belief that defines the experience of improbable events, especially improbably positive or negative ones. The Naturalism (philosophy), naturalistic interpretation is that positive and negative events may happen at any time, both due to random and non-random natural and artificial processes, and that even improbable events can happen by random chance. In this view, the epithet "lucky" or "unlucky" is a descriptive label that refers to an event's positivity, negativity, or improbability. Supernatural interpretations of luck consider it to be an attribute of a person or object, or the result of a favorable or unfavorable view of a deity upon a person. These interpretations often ''prescribe'' how luckiness or unluckiness can be obtained, such as by carrying a lucky charm or offering sacrifices or prayers to a deity. Saying someone is "born lucky" may hold different meanings, depending on the interpretation: it could simply mean that they have been bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roman Mythology
Roman mythology is the body of myths of ancient Rome as represented in the literature and visual arts of the Romans, and is a form of Roman folklore. "Roman mythology" may also refer to the modern study of these representations, and to the subject matter as represented in the literature and art of other cultures in any period. Roman mythology draws from the mythology of the Italic peoples and shares mythemes with Proto-Indo-European mythology. The Romans usually treated their traditional narratives as historical, even when these have miraculous or supernatural elements. The stories are often concerned with politics and morality, and how an individual's personal integrity relates to his or her responsibility to the community or Roman state. Heroism is an important theme. When the stories illuminate Roman religious practices, they are more concerned with ritual, augury, and institutions than with theology or cosmogony. Roman mythology also draws on Greek mythology, pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fortuna (luck)
Fortuna (, equivalent to the Greek goddess Tyche) is the goddess of fortune and the personification of luck in Roman religion who, largely thanks to the Late Antique author Boethius, remained popular through the Middle Ages until at least the Renaissance. The blindfolded depiction of her is still an important figure in many aspects of today's Italian culture, where the dichotomy ''fortuna / sfortuna'' (luck / unluck) plays a prominent role in everyday social life, also represented by the very common refrain "La eafortuna è cieca" (latin ''Fortuna caeca est''; "Luck oddessis blind"). Fortuna is often depicted with a gubernaculum (ship's rudder), a ball or Rota Fortunae (wheel of fortune, first mentioned by Cicero) and a cornucopia (horn of plenty). She might bring good or bad luck: she could be represented as veiled and blind, as in modern depictions of Lady Justice, except that Fortuna does not hold a balance. Fortuna came to represent life's capriciousness. She was also a godd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Astronomy
Radar astronomy is a technique of observing nearby astronomical objects by reflecting radio waves or microwaves off target objects and analyzing their reflections. Radar astronomy differs from ''radio astronomy'' in that the latter is a passive observation (i.e., receiving only) and the former an active one (transmitting and receiving). Radar systems have been conducted for six decades applied to a wide range of Solar System studies. The radar transmission may either be pulsed or continuous. The strength of the radar return signal is radar#Radar range equation, proportional to the inverse fourth-power of the distance. Upgraded facilities, increased transceiver power, and improved apparatus have increased observational opportunities. Radar techniques provide information unavailable by other means, such as testing general relativity by observing Mercury (planet), Mercury and providing a refined value for the astronomical unit. Radar imaging, Radar images provide information about th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Occultation
An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks from view (occults) an object in the background. In this general sense, occultation applies to the visual scene observed from low-flying aircraft (or computer-generated imagery) when foreground objects obscure distant objects dynamically, as the scene changes over time. If the closer body does not entirely conceal the farther one, the event is called a '' transit''. Both transit and occultation may be referred to generally as ''occlusion''; and if a shadow is cast onto the observer, it is called an eclipse. The symbol for an occultation, and especially a solar eclipse, is 🝵 (U+1F775 🝵). Occultations by the Moon The term occultation is most frequently used to describe lunar occultations, those relatively frequent occasions wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
