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6522 Aci
6522 Aci ( ''prov. designation'': ) is an elongated Phocaea asteroid from the inner regions of the asteroid belt. It was discovered on 9 July 1991, by American astronomer Eleanor Helin at Palomar Observatory in California, United States. The likely stony S-type asteroid has a rotation period of 5.65 hours and measures approximately in diameter. It was named for the Jaci river at Acireale in Italy, and refers to the myth of Acis and Galatea. Orbit and classification ''Aci'' is a member of the Phocaea family (), a relatively small group of stony asteroids with similar orbital characteristics. It orbits the Sun in the inner main-belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,345 days). Its orbit has an eccentricity of 0.20 and an inclination of 22 ° with respect to the ecliptic. In January 1990, the asteroid was first observed as at the German Karl Schwarzschild Observatory, extending the body's observation arc by 17 months prior to its official ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightcurve
In astronomy, a light curve is a graph of light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y axis and with time on the x axis. The light is usually in a particular frequency interval or band. Light curves can be periodic, as in the case of eclipsing binaries, Cepheid variables, other periodic variables, and transiting extrasolar planets, or aperiodic, like the light curve of a nova, a cataclysmic variable star, a supernova or a microlensing event or binary as observed during occultation events. The study of the light curve, together with other observations, can yield considerable information about the physical process that produces it or constrain the physical theories about it. Variable stars Graphs of the apparent magnitude of a variable star over time are commonly used to visualise and analyse their behaviour. Although the categorisation of variable star types is increasingly done from their spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FIN Tbl
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. An asteroid family is a more specific term than 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 asteroid belt, although several family-like groups such as the Pallas family, Hungaria family, and the Phocaea family ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphemus
Polyphemus (; grc-gre, Πολύφημος, Polyphēmos, ; la, Polyphēmus ) is the one-eyed giant son of Poseidon and Thoosa in Greek mythology, one of the Cyclopes described in Homer's ''Odyssey''. His name means "abounding in songs and legends". Polyphemus first appeared as a savage man-eating giant in the ninth book of the ''Odyssey''. The satyr play of Euripides is dependent on this episode apart from one detail; Polyphemus is made a pederast in the play. Later Classical writers presented him in their poems as heterosexual and linked his name with the nymph Galatea. Often he was portrayed as unsuccessful in these, and as unaware of his disproportionate size and musical failings. In the work of even later authors, however, he is presented as both a successful lover and skilled musician. From the Renaissance on, art and literature reflect all of these interpretations of the giant. Odysseus and Polyphemus Ancient sources In Homer's epic, Odysseus lands on the island of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greek Mythology
A major branch of classical mythology, Greek mythology is the body of myths originally told by the Ancient Greece, ancient Greeks, and a genre of Ancient Greek folklore. These stories concern the Cosmogony, origin and Cosmology#Metaphysical cosmology, nature of the world, the lives and activities of List of Greek mythological figures, deities, Greek hero cult, heroes, and List of Greek mythological creatures, mythological creatures, and the origins and significance of the ancient Greeks' own cult (religious practice), cult and ritual practices. Modern scholars study the myths to shed light on the religious and political institutions of ancient Greece, and to better understand the nature of myth-making itself. The Greek myths were initially propagated in an oral tradition, oral-poetic tradition most likely by Minoan civilization, Minoan and Mycenaean Greece, Mycenaean singers starting in the 18th century BC; eventually the myths of the heroes of the Trojan War and its after ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aci Sant'Antonio
Aci Sant'Antonio ( scn, Jaci Sant'Antoniu) is a ''comune'' (municipality) in the Metropolitan City of Catania in the Italian region of Sicily, located about southeast of Palermo and about northeast of Catania. The ''frazione'' of Santa Maria La Stella is home to an annual ''Presepe degli Antichi Mestiere'', which is a ''presepe vivente'' or animated crib that is presented every Christmas by the parish A parish is a territorial entity in many Christian denominations, constituting a division within a diocese. A parish is under the pastoral care and clerical jurisdiction of a priest, often termed a parish priest, who might be assisted by one o ... and visited by many people from all over Sicily. References External links Official website Cities and towns in Sicily {{Sicily-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aci Trezza
Aci Trezza () is a town in Sicily, southern Italy, a ''frazione'' of the comune of Aci Castello, c. 10 km north of Catania, with a population of around 5,000 people. Located on the coast of the Ionian Sea, the village has a long history of maritime activity. Aci Trezza is a popular spot for Italian vacationers in the summer. The patron Saint of the town is St. John the Baptist. The Festa of San Giovanni is celebrated each year during the last week of June in his honor. The Islands of the Cyclops Off the coast of Aci Trezza are three tall, prominent sea stacks. According to local legend, these were the great stones thrown at Odysseus in the epic poem ''The Odyssey'' by the monster Cyclops. The islands are thus referred to as the "isole dei ciclopi" (islands of the Cyclops, or Cyclopean Isles) by locals. This complements the notion that the Cyclops once had a smithy below Mount Etna, which looms over the village to the northwest. Cultural references Giovanni Verga's novel '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aci Castello
Aci Castello ( scn, Jaci Casteḍḍu) is a ''comune'' in the Metropolitan City of Catania in Sicily, Italy. The city is located north of Catania on the Mediterranean coast. The primary economic sectors are agriculture and industry (in Catania). The city is neighbored by Aci Catena, Acireale, Catania, San Gregorio di Catania and Valverde. History The town of Aci Castello developed around the castle, which was built in 1076 by the Normans upon the foundations of a 7th-century Byzantine fortification. In 1169, Aci Castello started to expand after an eruption of Mount Etna made the towns in its vicinity uninhabitable. The castle later became the property of the bishops of Catania. In 1296, Roger of Lauria, admiral of the Aragonese fleet during the War of the Sicilian Vespers, was granted the fief of Aci and its castle as a reward for his faithful service to King Frederick III of Sicily. When relations between the two men soured and di Lauria transferred his loyalties to the Angev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sicily
(man) it, Siciliana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Ethnicity , demographics1_footnotes = , demographics1_title1 = Sicilian , demographics1_info1 = 98% , demographics1_title2 = , demographics1_info2 = , demographics1_title3 = , demographics1_info3 = , timezone1 = CET , utc_offset1 = +1 , timezone1_DST = CEST , utc_offset1_DST = +2 , postal_code_type = , postal_code = , area_code_type = ISO 3166 code , area_code = IT-82 , blank_name_sec1 = GDP (nominal) , blank_info_sec1 = €89.2 billion (2018) , blank1_name_sec1 = GDP per capita , blank1_info_sec1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minor Planet
According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor planet'', but that year's meeting reclassified minor planets and comets into dwarf planets and small Solar System bodies (SSSBs).Press release, IAU 2006 General Assembly: Result of the IAU Resolution votes International Astronomical Union, August 24, 2006. Accessed May 5, 2008. Minor planets include asteroids ( |
Observation Arc
In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly used in the discovery and tracking of asteroids and comets. Arc length has the greatest influence on the accuracy of an orbit. The number and spacing of intermediate observations has a lesser effect. Short arcs A very short arc leaves a high uncertainty parameter. The object might be in one of many different orbits, at many distances from Earth. In some cases, the initial arc was too short to determine if the object was in orbit around the Earth, or orbiting out in the asteroid belt. With a 1-day observation arc, was thought to be a trans-Neptunian dwarf planet, but is now known to be a 1 km main-belt asteroid. With an observation arc of 3 days, was thought to be a Mars-crossing asteroid that could be a threat to Earth, but was later ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Schwarzschild Observatory
The Karl Schwarzschild Observatory (german: Karl-Schwarzschild-Observatorium) is a German astronomical observatory in Tautenburg near Jena, Thuringia. It was founded in 1960 as an affiliated institute of the former German Academy of Sciences at Berlin and named in honour of the astronomer and physicist Karl Schwarzschild (1873–1916). In 1992, the institute was re-established as Thuringian State Observatory (''Thüringer Landessternwarte'', TLS). The observatory has the largest telescope located in Germany, which is also the largest Schmidt camera in the world. Made by VEB Zeiss Jena (the branch of Carl Zeiss located in Jena in what was then East Germany), this instrument is known as (2m) Alfred Jensch Telescope: though its mirror is 2 metres in diameter, the telescope's aperture is 1.34 m. The observatory has observed several exoplanets and brown dwarfs, as around the stars HD 8673, 30 Arietis, 4 Ursae Majoris, and around HD 13189 on 5 April 2005. The observatory also host ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecliptic
The ecliptic or ecliptic plane is the orbital plane of the Earth around the Sun. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic against the background of stars. The ecliptic is an important reference plane and is the basis of the ecliptic coordinate system. Sun's apparent motion The ecliptic is the apparent path of the Sun throughout the course of a year. Because Earth takes one year to orbit the Sun, the apparent position of the Sun takes one year to make a complete circuit of the ecliptic. With slightly more than 365 days in one year, the Sun moves a little less than 1° eastward every day. This small difference in the Sun's position against the stars causes any particular spot on Earth's surface to catch up with (and stand directly north or south of) the Sun about four minutes later each day than it would if Earth did not orbit; a day on Earth is therefore 24 hours ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
