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Stephen P. Synnott
Stephen P. Synnott (born 1946) is an American astronomer and Voyager scientist at JPL, and expert in spacecraft optical navigation techniques. He has discovered several natural satellites of outer Solar System planets such as Metis, Puck, Larissa (recovered), Cressida, Thebe and Proteus. The minor planet 6154 Stevesynnott, discovered by Henry E. Holt in 1990, was named in his honour. The approved naming citation was published by the Minor Planet Center The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory. Funct ... on 1 July 1996 (). References 1946 births American planetary scientists Living people {{US-astronomer-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voyager Navigation Team
Voyager may refer to: Computing and communications * LG Voyager, a mobile phone model manufactured by LG Electronics * NCR Voyager, a computer platform produced by NCR Corporation * Voyager (computer worm), a computer worm affecting Oracle databases * Voyager (library program), the integrated library system from Ex Libris Group * Voyager (web browser), a web browser for Amiga computers * Voyager Digital, a defunct cryptocurrency brokerage company * HP Voyager series, code name for a Hewlett-Packard series of handheld programmable calculators Transport Air * Airbus Voyager, Royal Air Force version of the Airbus A330 MRTT * Frequent flyer program of South African Airways * Egvoyager Voyager 203, an Italian ultralight aircraft * Raj Hamsa Voyager, an Indian ultralight trike design * Rutan Voyager, the first airplane to fly around the world nonstop without refuelling Land * Bombardier Voyager, a high-speed train operated in the United Kingdom ** Bombardier ''Voyager'' (Br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voyager Program
The Voyager program is an American scientific program that employs two interstellar probes, ''Voyager 1'' and ''Voyager 2''. They were launched in 1977 to take advantage of a favorable planetary alignment to explore the two gas giants Jupiter and Saturn and potentially also the ice giants, Uranus and Neptune—to Flyby (spaceflight), fly near them while collecting data for transmission back to Earth. After ''Voyager 1'' successfully completed its flyby of Saturn and its moon Titan (moon), Titan, it was decided to send ''Voyager 2'' on flybys of Uranus and Neptune. After the planetary flybys were complete, decisions were made to keep the probes in operation to explore Outer space, interstellar space and the outer regions of the Solar System. On 25 August 2012, data from ''Voyager 1'' indicated that it had entered interstellar space. On 5 November 2019, data from ''Voyager 2'' indicated that it also had entered interstellar space. On 4 November 2019, scientists reported that on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Satellite
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are colloquially referred to as moons, a derivation from the Moon of Earth. In the Solar System, there are six planetary satellite systems containing 418 known natural satellites altogether. Seven objects commonly considered dwarf planets by astronomers are also known to have natural satellites: , Pluto, Haumea, , Makemake, , and Eris. As of January 2022, there are 447 other minor planets known to have natural satellites. A planet usually has at least around 10,000 times the mass of any natural satellites that orbit it, with a correspondingly much larger diameter. The Earth–Moon system is a unique exception in the Solar System; at 3,474 kilometres (2,158 miles) across, the Moon is 0.273 times the diameter of Earth and about of its mass. The next largest ratios are the N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outer Solar System
The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar System" and "solar system" structures in theinaming guidelines document. The name is commonly rendered in lower case ('solar system'), as, for example, in the ''Oxford English Dictionary'' an''Merriam-Webster's 11th Collegiate Dictionary''. is the gravitationally bound system of the Sun and the objects that orbit it. It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is a typical star that maintains a balanced equilibrium by the fusion of hydrogen into helium at its core, releasing this energy from its outer photosphere. Astronomers classify it as a G-type main-sequence star. The largest objects that orbit the Sun are the eight planets. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metis (moon)
Metis , also known as , is the innermost known moon of Jupiter. It was discovered in 1979 in images taken by ''Voyager 1'', and was named in 1983 after the Titaness Metis, the first wife of Zeus and the mother of Athena. Additional observations made between early 1996 and September 2003 by the ''Galileo'' spacecraft allowed its surface to be imaged. Metis is tidally locked to Jupiter, and its shape is strongly asymmetrical, with the largest diameter being almost twice as large as the smallest one. It is also one of the two moons known to orbit Jupiter in less than the length of Jupiter's day, the other being Adrastea. It orbits within the main ring of Jupiter, and is thought to be a major contributor of ring material. Discovery and observations Metis was discovered in 1979 by Stephen P. Synnott in images taken by the ''Voyager 1'' probe and was provisionally designated as . In 1983, it was officially named after the mythological Metis, a Titaness who was the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Puck (moon)
Puck is the sixth-largest moon of Uranus. It was discovered in December 1985 by the ''Voyager 2'' spacecraft. The name ''Puck'' follows the convention of naming Uranus's moons after characters from Shakespeare. The orbit of Puck lies between the rings of Uranus and the first of Uranus's large moons, Miranda (moon), Miranda. Puck is approximately spherical in shape and has diameter of about 162 km. It has a dark, heavily cratered surface, which shows spectral signs of water ice. Discovery and naming Puck—the largest inner moon of Uranus—was discovered from the images taken by ''Voyager 2'' on 30 December 1985. It was given the temporary designation S/1985 U 1. The moon was later named after the character Puck (A Midsummer Night's Dream), Puck who appears in Shakespeare's ''A Midsummer Night's Dream'', a little Sprite (folklore), sprite who travels around the globe at night with the fairy, fairies. In Celtic mythology and English folklore, a ''Puck (mythology) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larissa (moon)
Larissa, also known as Neptune VII, is the fifth-closest inner satellite of Neptune. It is named after Larissa (mythology), Larissa, a lover of Poseidon (the Greek mythology, Greek equivalent of the Roman mythology, Roman god Neptune_(mythology), Neptune). Larissa is also the eponymous nymph of the Larissa, city in Thessaly, Greece. Discovery Larissa was first discovered by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen, based on fortuitous ground-based stellar occultation observations on May 24, 1981. It was given the temporary Provisional_designation_in_astronomy, provisional designation S/1981 N 1 and its supposed existence was announced on May 29, 1981. The moon was later recovered and confirmed to be the only object in its orbit during the ''Voyager 2'' flyby in 1989 after which it received the additional designation S/1989 N 2 on August 2, 1989. The announcement by Stephen P. Synnott spoke of "10 frames taken over 5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cressida (moon)
: ''There is also an asteroid called 548 Kressida.'' Cressida is an inner satellite of Uranus. It was discovered from the images taken by ''Voyager 2'' on 9 January 1986, and was given the temporary designation S/1986 U 3. It was named after Cressida, the Trojan daughter of Calchas, a tragic heroine who appears in William Shakespeare's play ''Troilus and Cressida'' (as well as in tales by Geoffrey Chaucer and others). It is also designated Uranus IX. Cressida belongs to the Portia group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda, and Perdita. These satellites have similar orbits and photometric properties. Other than its orbit, size of 92 × 74 km, and geometric albedo of 0.08, virtually nothing is known about it. In ''Voyager 2'' imagery Cressida appears as an elongated object, with its major axis pointing towards Uranus. The ratio of axes of Cressida's prolate spheroid is 0.8 ± 0.3. Its surface is grey in co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thebe (moon)
Thebe (), also known as , is the fourth of Jupiter's moons by distance from the planet. It was discovered by Stephen P. Synnott in images from the ''Voyager 1'' space probe taken on March 5, 1979, while making its flyby of Jupiter. In 1983, it was officially named after the mythological nymph Thebe. The second largest of the inner satellites of Jupiter, Thebe orbits within the outer edge of the Thebe gossamer ring that is formed from dust ejected from its surface. It is irregularly shaped and reddish in colour, and is thought like Amalthea to consist of porous water ice with unknown amounts of other materials. Its surface features include large craters and high mountains—some of them are comparable to the size of the moon itself. Thebe was photographed in 1979 by the ''Voyager 1'' and ''2'' spacecraft, and later, in more detail, by the ''Galileo'' orbiter in the 1990s. Discovery and observations Thebe was discovered by Stephen P. Synnott in images from the ''Voyage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proteus (moon)
Proteus ( ), also known as Neptune VIII, is the second-largest Neptune, Neptunian natural satellite, moon, and Neptune's largest Inner moon, inner satellite. Discovered by ''Voyager 2'' in 1989, it is named after Proteus, the shape-changing sea god of Greek mythology. Proteus orbits Neptune in a nearly equatorial orbit at a distance of about 4.75 times the radius of Neptune's equator. Despite being a predominantly icy body more than in diameter, Proteus's shape deviates significantly from an ellipsoid. It is shaped more like an irregular polyhedron with several slightly concave facets and relief as high as . Its surface is dark, neutral in color, and heavily cratered. Proteus's largest crater is Pharos (crater), Pharos, which is more than in diameter. There are also a number of Cliff, scarps, grooves, and valleys related to large craters. Proteus is probably not an original body that formed with Neptune. It could have accreted later from the debris formed when the largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry E
Henry may refer to: People and fictional characters * Henry (given name), including lists of people and fictional characters * Henry (surname) * Henry, a stage name of François-Louis Henry (1786–1855), French baritone Arts and entertainment * ''Henry'' (2011 film), a Canadian short film * ''Henry'' (2015 film), a virtual reality film * '' Henry: Portrait of a Serial Killer'', a 1986 American crime film * ''Henry'' (comics), an American comic strip created in 1932 by Carl Anderson * "Henry", a song by New Riders of the Purple Sage Places Antarctica * Henry Bay, Wilkes Land Australia * Henry River (New South Wales) * Henry River (Western Australia) Canada * Henry Lake (Vancouver Island), British Columbia * Henry Lake (Halifax County), Nova Scotia * Henry Lake (District of Chester), Nova Scotia New Zealand * Lake Henry (New Zealand) * Henry River (New Zealand) United States * Henry, Illinois * Henry, Indiana * Henry, Nebraska * Henry, South Dakota * Henry Count ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
