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46P/Wirtanen
46P/Wirtanen
46P/Wirtanen
is a small short-period comet with a current orbital period of 5.4 years. It was the original target for close investigation by the Rosetta spacecraft, planned by the European Space Agency, but an inability to meet the launch window led to Rosetta being sent to 67P/Churyumov–Gerasimenko
67P/Churyumov–Gerasimenko
instead.[4] It belongs to the Jupiter
Jupiter
family of comets, all of which have aphelia between 5 and 6 AU. Its diameter is estimated at 1.2 kilometres (0.75 mi).Contents1 Discovery 2 Perihelion passages 3 Exploration proposals 4 Associated Piscid Meteor Shower 5 References 6 External linksDiscovery[edit] 46P/Wirtanen
46P/Wirtanen
was discovered photographically on January 17, 1948, by the American astronomer Carl A. Wirtanen. The plate was exposed on January 15 during a stellar proper motion survey for the Lick Observatory
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Lunar Distance (astronomy)
Lunar distance (LD or Δ ⊕ L textstyle Delta _ oplus L ), also called Earth– Moon
Moon
distance, Earth– Moon
Moon
characteristic distance, or distance to the Moon, is a unit of measure in astronomy. It is the average distance from the center of Earth
Earth
to the center of the Moon. More technically, it is the mean semi-major axis of the geocentric lunar orbit. It may also refer to the time-averaged distance between the centers of the Earth
Earth
and the Moon, or less commonly, the instantaneous Earth– Moon
Moon
distance
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Advanced Stirling Radioisotope Generator
The advanced Stirling radioisotope generator
Stirling radioisotope generator
(ASRG) is a radioisotope power system first developed at NASA's Glenn Research Center. It uses a Stirling power conversion technology to convert radioactive-decay heat into electricity for use on spacecraft
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Elongation (astronomy)
In astronomy, a planet's elongation is the angular separation between the Sun
Sun
and the planet, with Earth
Earth
as the reference point. The greatest elongation of a given inferior planet occurs when this planet’s position, in its orbital path around the Sun, is at tangent to the observer on Earth. Since an inferior planet is well within the area of Earth's orbit
Earth's orbit
around the Sun, observation of its elongation should not pose that much a challenge (compared to deep-sky objects, for example). When a planet is at its greatest elongation, it appears farthest from the Sun
Sun
as viewed from Earth, so its apparition is also best at that point. When an inferior planet is visible after sunset, it is near its greatest eastern elongation. When an inferior planet is visible before sunrise, it is near its greatest western elongation
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Kilometre
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; /ˈkɪləmiːtər/ or /kɪˈlɒmɪtər/) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix
SI prefix
for 7003100000000000000♠1000)
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Mile
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959. With qualifiers, "mile" is also used to describe or translate a wide range of units derived from or roughly equivalent to the Roman mile, such as the nautical mile (now 1.852 km exactly), the Italian mile (roughly 1.852 km), and the Chinese mile (now 500 m exactly). The Romans divided their mile into 5,000 feet but the greater importance of furlongs in pre-modern England meant that the statute mile was made equivalent to 8 furlongs or 5,280 feet in 1593. This form of the mile then spread to the British-colonized nations who continue to employ the mile. The US Geological Survey now employs the metre for official purposes but legacy data from its 1927 geodetic datum has meant that a separate US survey mile (6336/3937 km) continues to see some use
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Provisional Designation In Astronomy
Provisional designation in astronomy is the naming convention applied to astronomical objects immediately following their discovery. The provisional designation is usually superseded by a permanent designation once a reliable orbit has been calculated
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Discovery Program
NASA's Discovery Program
Discovery Program
is a series of lower-cost (as compared to New Frontiers or Flagship Programs), highly focused American scientific space missions that are exploring the Solar System. It was founded in 1992 to implement then- NASA
NASA
Administrator Daniel S. Goldin's vision of "faster, better, cheaper" planetary missions. Discovery missions differ from traditional NASA
NASA
missions where targets and objectives are pre-specified. Instead, these cost-capped missions are proposed and led by a scientist called the Principal Investigator (PI). Proposing teams may include people from industry, small businesses, government laboratories, and universities. Proposals are selected through a competitive peer review process
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InSight
Insight
Insight
is the understanding of a specific cause and effect within a specific context. The term insight can have several related meanings:a piece of information the act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek) an introspection the power of acute observation and deduction, discernment, and perception, called intellection or noesis an understanding of cause and effect based on identification of relationships and behaviors within a model, context, or scenario (see artificial intelligence)An insight that manifests itself suddenly, such as understanding how to solve a difficult problem, is sometimes called by the German word Aha-Erlebnis. The term was coined by the German psychologist and theoretical linguist Karl Bühler
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Hubble Space Telescope
The Hubble Space Telescope
Hubble Space Telescope
(HST) is a space telescope that was launched into low Earth
Earth
orbit in 1990 and remains in operation. Although not the first space telescope, Hubble is one of the largest and most versatile, and is well known as both a vital research tool and a public relations boon for astronomy. The HST is named after the astronomer Edwin Hubble, and is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.[6] With a 2.4-meter (7.9 ft) mirror, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared spectra. Hubble's orbit outside the distortion of Earth's atmosphere
Earth's atmosphere
allows it to take extremely high-resolution images, with substantially lower background light than ground-based telescopes
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Baltimore Sun
The Baltimore Sun
The Baltimore Sun
is the largest general-circulation daily newspaper based in the American state of Maryland
Maryland
and provides coverage of local and regional news, events, issues, people, and industries.[3] Founded in 1837, it is owned by tronc (formerly known as Tribune Publishing).Contents1 History 2 Editions2.1 Daily 2.2 Sunday 2.3 baltimoresun.com 2.4 b3 Contributors 4 Facilities 5 Controversies 6 In popular culture 7 News partnership 8 See also 9 References 10 Further reading 11 External linksHistory[edit] The Sun was founded on May 17, 1837, by printer/publisher Arunah Shepherdson Abell (1806–1888) and two associates, William M. Swain (1809–1868) and Azariah H. Simmons, recently from Philadelphia, where they had started and published the Philadelphia
Philadelphia
Public Ledger. Abell was born in Rhode Island, where he began journalism with the Providence Patriot
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ESA
The European Space Agency
European Space Agency
(ESA; French: Agence spatiale européenne, ASE;[4][5] German: Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states[6] dedicated to the exploration of space. Established in 1975 and headquartered in Paris, France, ESA has a worldwide staff of about 2,000[7] and an annual budget of about €5.25 billion / US$5.77 billion (2016).[8] ESA's space flight programme includes human spaceflight (mainly through participation in the International Space Station
International Space Station
programme); the launch and operation of unmanned exploration missions to other planets and the Moon; Earth observation, science and telecommunication; designing launch vehicles; and maintaining a major spaceport, the Guiana Space Centre
Guiana Space Centre
at Kourou, French Guiana
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Earth's Orbit
Earth's orbit
Earth's orbit
is the trajectory along which Earth
Earth
travels around the Sun
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Meteor Shower
A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids entering Earth's atmosphere
Earth's atmosphere
at extremely high speeds on parallel trajectories. Most meteors are smaller than a grain of sand, so almost all of them disintegrate and never hit the Earth's surface
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Pisces (constellation)
Pisces is a constellation of the zodiac. Its name is the Latin plural for fish. It lies between Aquarius to the west and Aries to the east. The ecliptic and the celestial equator intersect within this constellation and in Virgo
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Syuichi Nakano
Syuichi Nakano (中野 主一, Nakano Shuichi, born September 11, 1947) is a Japanese astronomer. He specializes in the study of comets, in particular calculating their orbits and making predictions about when periodic comets will return for another perihelion approach. It is considerably more difficult to predict the orbits of comets than of other types of Solar System
Solar System
objects, since their orbits are susceptible not only to perturbations from the planets but also to non-gravitational forces due to the release of gaseous material in the form of a comet's coma and tail. He is affiliated with the Computing & Minor Planet
Planet
Sections (Center for Astrodynamics) of the Oriental Astronomical Association in Sumoto, Japan. He publishes the Nakano Notes on comet observations and ephemerides. In 2001 he won the Amateur Achievement Award of the Astronomical Society of the Pacific
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