Comet

A comet (denoted by ☄) is a small body in the solar system that orbits the sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail — both due primarily to the effects of solar radiation upon the comet's nucleus, which itself is a minor planet composed of rock, dust, and ices. Due to their origins in the outer solar system and their propensity to be highly affected by relatively close approaches to the major planets, comets' orbits are constantly evolving. Some are moved into sungrazing orbits that destroy the comets when they near the sun, while others ...

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Read more here: » Comet: Encyclopedia - Comet

Comet: Encyclopedia II - Comet - Comet nomenclature The names given to comets have followed several different conventions over the past two centuries. Before any systematic naming convention was adopted, comets were named in a variety of ways. Prior to the early 20th century, most comets were simply referred to by the year in which they appeared, sometimes with additional adjectives for particularly bright comets; thus, the "Great Comet of 1680" (Kirch's Comet), the "Great September Comet of 1882," and the "Daylight Comet of 1910" ("Great January Comet of 1910"). After Edmund Halley demonstra ...

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Comet: Encyclopedia - Comet Encke

Comet Encke (officially designated 2P/Encke) is a periodic comet, named after Johann Franz Encke, who through laborious study of its orbit and many calculations was able to link multiple observations in 1786 (2P/1786 B1), 1795 (2P/1795 V1), 1805 (2P/1805 U1) and 1818 (2P/1818 W1) to the same object. In 1819 he published his conclusions in the journal Correspondance astronomique, and pr ...

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Comet: Encyclopedia - Comet goldfish

The Comet is a commonly kept form of goldfish, the only type to have originated in the United States. Characterized by a long, tall, flowing tailfin, they can be differentiated from the common goldfish, although otherwise they are very similar. Both of these varieties are quite hardy and will do well in an outdoor pond, as well as in indoor cool-water aquariums; however, they should not be kept in "goldfish bowls", as they grow much too large and require frequent water changes and/or filtration. There are also several different variat

Comet: Encyclopedia - Comet Hyakutake

Comet Hyakutake (pronounced /ħʝakutake/ or /ħʃakutake/; formally designated C/1996 B2) was a comet that was discovered in January 1996, passed very close to the Earth in March of that year, and was dubbed The Great Comet of 1996. It was one of the closest cometary approaches to the Earth in the last 200 years, which resulted in the comet becoming very bright, and it was seen by a large number of people around the world. The comet temporarily upstaged the long-awaited Comet Hale-Bopp which was approaching the inner solar system at the time, althou ...

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Comet: Encyclopedia - Comet Kohoutek

Comet Kohoutek (formally designated C/1973 E1) was first sighted on March 7, 1973 by Czech astronomer Luboš Kohoutek. It attained perihelion on December 26 that same year. Kohoutek was hyped by the media as the "comet of the century", but gave a poor display and was considered a letdown, leading some to nickname it "Comet Watergate". In the nomenclature of the time it was known as either Comet 1973 XII or Comet 1973f< ...

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Comet Kohoutek - Music and art inspired by Comet Kohoutek

Comet: Encyclopedia - Comet Hale-Bopp

Comet Hale-Bopp (formally designated C/1995 O1) was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. It was visible to the naked eye for a record 18 months, twice as long as the previous record holder, the Great Comet of 1811. Hale-Bopp was discovered on 23 July 1995 at a very large distance from the Sun, raising expectations that the comet could become very bright when it passed close to the Sun. Although comet brightnesses are very difficult to predi ...

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Comet: Encyclopedia - Comet Ikeya-Seki

Comet Ikeya-Seki (C/1965 S1) was a comet discovered independently by Kaoru Ikeya and Tsutomu Seki. First observed as a faint telescopic object on September 18, 1965, the first calculations of its orbit suggested that on October 21, it would pass just 450,000km above the sun's surface, and would probably become extremely bright. Comets can defy all predictions, but Ikeya-Seki performed as expected. As it approached perihelion observers reported that it was clearly visible in the daytime sky next to the sun. In Japan, where it re ...

Comet: Encyclopedia - Great Comet of 1882

The Great Comet of 1882 (modern formal designation: C/1882 R1) was a comet which became very bright in September 1882. It was a member of the Kreutz Sungrazers, a family of comets which pass very close to the Sun's surface at perihelion. The comet was bright enough to be visible next to the sun in the daytime sky at its perihelion. Great Comet of 1882 - Discovery. The comet appeared suddenly in the morning skies in September 1882, and as it was already visible to the naked eye when it became visible ...

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Comet: Encyclopedia - De Havilland Comet

The de Havilland Comet of Britain was the world's first commercial jet airliner. It is infamous for being the first to experience the metal fatigue of jet aircraft due to high flight altitudes. De Havilland Comet - History. Design work began in 1946 under Ronald Bishop and the intention was to have a commercial aircraft by 1952. The DH 106 Comet first flew on July 27, 1949. The design was similar to other airliners except that four of the new, albeit underpowered, de Havilland Ghost 50 turbojets were mounte ...

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De Havilland Comet - History

Comet: Encyclopedia - Comet Shoemaker-Levy 9

Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system objects. This generated a large amount of coverage in the popular media, and SL9 was closely observed by astronomers worldwide. The comet provided many revelations about Jupiter and its atmosphere and highlighted Jupit ...

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Comet: Encyclopedia - Bill Haley & His Comets

Bill Haley and His Comets was a rock and roll band that was founded in the 1950s and continued until Haley's death in 1981. This band, which was also known by the names Bill Haley and The Comets and Bill Haley's Comets (and variations thereof), was one of the earliest groups of white musicians to bring rock and roll to the attention of white America and the rest of the world. Bandleader Bill Haley had previously been a country performer; after recording a country and western-styled version of "Rocket 88", a rhythm and blues song, ...

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Comet: Encyclopedia - 19P/Borrelly

Comet Borrelly (formally designated 19P/Borrelly) is a periodic comet, which was visited by the space craft Deep Space 1. 19P/Borrelly - Comet parameters. 19P/Borrelly - Discovery. The comet was discovered by Alphonse Louis Nicolas Borrelly during a routine search for comets at Marseilles, France on December 28, 1904. 19P/Borrelly - Deep Space 1 flyby. On September 21, 2001 the spacecraft Deep Space 1, which was launched to test ...

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Comet: Encyclopedia - 67P/Churyumov-Gerasimenko

67P/Churyumov-Gerasimenko is the designation of a comet with a current orbital period of 6.6 years. It is the destination of the European Space Agency's Rosetta spacecraft mission, launched on March 2, 2004. (Krolikowska, 2003) 67P/Churyumov-Gerasimenko - Comet parameters. 67P/Churyumov-Gerasimenko - Hubble pictures. As preparation for the Rosetta mission Hubble Space Telescope pictures taken on March 12, 2003, were closely analyzed. An overall 3-D model was constructed and comp ...

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Comet: Encyclopedia II - Great comet - Reasons comets become great comets

The vast majority of comets are never bright enough to be seen by the naked eye. They generally pass through the inner solar system unseen by anyone except astronomers. However, occasionally, a comet may brighten to naked eye visibility, and even more rarely it may become as bright or brighter than the brightest stars. How bright a comet becomes depends on three main factors. Great comet - Size and activity of the nucleus. Cometary nuclei vary in size from a few hundreds of metres across or less to many ki ...

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Comet

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