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Yoshiaki Oshima
(born 1952) is a Japanese astronomer at Gekko Observatory and prolific discoverer of 61 asteroids as credited by the Minor Planet Center, and include the binary asteroid 4383 Suruga, the potentially hazardous object (7753) 1988 XB and the Jupiter trojan 4715 Medesicaste. International asteroid monitoring project Japan Spaceguard Association (JSGA) is keen to have astronomical education for young people and held ''Spaceguard Private Investigator of the Stars— the fugitives are asteroids!'' program in 2001. Yoshiaki Oshima participated as one of the committee member. JSGA submitted a paper on that project in a proceedings, with Oshima as a contributor. JSGA held an astronomical education program as part of their International Asteroid Monitoring Project, that collaborated with the British Council and its International Schools' Observatory (ISO) program which had involved 12 teams of junior high to senior high school classes from Asian and European countries. The Privat ... [...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 ( |
Yomiuri Shinbun
The (lit. ''Reading-selling Newspaper'' or ''Selling by Reading Newspaper'') is a Japanese newspaper published in Tokyo, Osaka, Fukuoka, Fukuoka, Fukuoka, and other major Japanese cities. It is one of the five major newspapers in Japan; the other four are the ''The Asahi Shimbun, Asahi Shimbun'', the ''Chunichi Shimbun (Tokyo Shimbun)'' the ''Mainichi Shimbun'', and the ''The Nikkei, Nihon Keizai Shimbun''. It is headquartered in Otemachi, Chiyoda, Tokyo.' It is a newspaper that represents Tokyo and generally has a Conservatism, conservative orientation. It is one of Japan's leading newspapers, along with the Osaka-based Liberalism, liberal (Third way) Asahi Shimbun and the Nagoya-based Social democratic Chunichi Shimbun. It is published by regional bureaus, all of them subsidiaries of #Yomiuri Group, The Yomiuri Shimbun Holdings, Japan's largest media conglomerate by revenue and the second largest media conglomerate by size behind Sony,The Yomiuri Shimbun Holdings is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1952 Births
Year 195 ( CXCV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Scrapula and Clemens (or, less frequently, year 948 ''Ab urbe condita''). The denomination 195 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Septimius Severus has the Roman Senate deify the previous emperor Commodus, in an attempt to gain favor with the family of Marcus Aurelius. * King Vologases V and other eastern princes support the claims of Pescennius Niger. The Roman province of Mesopotamia rises in revolt with Parthian support. Severus marches to Mesopotamia to battle the Parthians. * The Roman province of Syria is divided and the role of Antioch is diminished. The Romans annexed the Syrian cities of Edessa and Nisibis. Severus re-establish his h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
5258 Rhoeo
5258 Rhoeo, ''provisional designation'': , is a Jupiter trojan and member of the Eurybates family from the Greek camp, approximately in diameter. It was discovered on 1 January 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory, east of Shizuoka, Japan. The assumed C-type asteroid belongs to the 90 largest Jupiter trojans and has a rotation period of 19.9 hours. It was named from Greek mythology after Rhoeo, lover of Apollo and mother of his son Anius. Orbit and classification ''Rhoeo'' is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60 ° ahead of the Gas Giant's orbit in a 1:1 resonance ''(see Trojans in astronomy)''. It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 9 months (4,303 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.08 and an inclination of 6 ° with respect to the ecliptic. The body's observation arc begins with its official discovery obs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minor-planet Moon
A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite. , there are 457 minor planets known or suspected to have moons. Discoveries of minor-planet moons (and binary objects, in general) are important because the determination of their orbits provides estimates on the mass and density of the primary, allowing insights into their physical properties that are generally not otherwise accessible. Several of the moons are quite large compared to their primaries: 90 Antiope, Mors–Somnus and Sila–Nunam (95%), Patroclus–Menoetius, Altjira and Lempo–Hiisi (90%, with Lempo–Paha at 50%). The largest known minor-planet moon in ''absolute'' size is Pluto's largest moon Charon, which itself has about half the diameter of Pluto. The first modern era mention of the possibility of an asteroid satellite was in connection with an occultation of the bright star Gamma Ceti by the asteroid 6 Hebe in 1977. The observer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Asteroid
A binary asteroid is a system of two asteroids orbiting their common barycenter. The binary nature of 243 Ida was discovered when the Galileo spacecraft flew by the asteroid in 1993. Since then numerous binary asteroids and several triple asteroids have been detected. The mass ratio of the two components – called the "primary" and "secondary" of a binary system – is an important characteristic. Most binary asteroids have a large mass ratio, i.e. a relatively small satellite in orbit around the main component. Systems with a small minor-planet moon – also called "companion" or simply "satellite" – include 87 Sylvia, 107 Camilla, 45 Eugenia, 121 Hermione, 130 Elektra, 22 Kalliope, 283 Emma, 379 Huenna, 243 Ida and 4337 Arecibo (in order of decreasing primary size). Some binary systems have a mass ratio near unity, i.e., two components of similar mass. They include 90 Antiope, , and 69230 Hermes, with average compo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jupiter Trojan
The Jupiter trojans, commonly called trojan asteroids or simply trojans, are a large group of asteroids that share the planet Jupiter's orbit around the Sun. Relative to Jupiter, each trojan librates around one of Jupiter's stable Lagrange points: either ', existing 60° ahead of the planet in its orbit, or ', 60° behind. Jupiter trojans are distributed in two elongated, curved regions around these Lagrangian points with an average semi-major axis of about 5.2 AU. The first Jupiter trojan discovered, 588 Achilles, was spotted in 1906 by German astronomer Max Wolf. More than 9,800 Jupiter trojans have been found . By convention, they are each named from Greek mythology after a figure of the Trojan War, hence the name "trojan". The total number of Jupiter trojans larger than 1 km in diameter is believed to be about , approximately equal to the number of asteroids larger than 1 km in the asteroid belt. Like main-belt asteroids, Jupiter trojans form families. , man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Distance (astronomy)
The instantaneous Earth–Moon distance, or distance to the Moon, is the distance from the center of Earth to the center of the Moon. Lunar distance (LD or \Delta_), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit. The lunar distance is on average approximately , or 1.28 light-seconds; this is roughly 30 times Earth's diameter or 9.5 times Earth's circumference. A little less than 400 lunar distances make up an astronomical unit. The semi-major axis has a value of . The time-averaged distance between the centers of Earth and the Moon is . The actual distance varies over the course of the orbit of the Moon, from at the perigee to at apogee, resulting in a differential range of . Lunar distance is commonly used to express the distance to near-Earth object encounters. Lunar semi-major axis is an important astronomical datum; the few millimeter precision of the range measurements ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potentially Hazardous Asteroid
A potentially hazardous object (PHO) is a near-Earth object – either an asteroid or a comet – with an orbit that can make close approaches to the Earth and is large enough to cause significant regional damage in the event of impact. They are defined as having a minimum orbit intersection distance with Earth of less than and an absolute magnitude of 22 or brighter. More than 99% of the known potentially hazardous objects are not an impact threat over the next 100 years. , only 17 potentially hazardous objects are listed on the Sentry Risk Table as objects that are known not to be a threat over the next hundred years are excluded. Over hundreds if not thousands of years, "potentially hazardous" asteroids have the potential for their orbits to evolve to live up to their namesake. Most of these objects are potentially hazardous asteroids (PHAs), and a few are comets. there are 2,304 known PHAs (about 8% of the total near-Earth population), of which 153 are estimated to be large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Near-Earth Object
A near-Earth object (NEO) is any small Solar System body whose orbit brings it into proximity with Earth. By convention, a Solar System body is a NEO if its closest approach to the Sun (perihelion) is less than 1.3 astronomical units (AU). If a NEO's orbit crosses the Earth's orbit, and the object is larger than across, it is considered a potentially hazardous object (PHO). Most known PHOs and NEOs are asteroids, but a small fraction are comets. There are over 30,503 known near-Earth asteroids (NEAs) and over a hundred known short-period near-Earth comets (NECs). A number of solar-orbiting meteoroids were large enough to be tracked in space before striking the Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of the Earth. Asteroids as small as in diameter can cause significant damage to the local environment and human populations. Larger asteroids penetrate the atmosphere to the surf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nihondaira Observatory
Nihondaira Observatory (also known as Oohira Station, Obs. code: 385) is an astronomical observatory that is located on a hill overlooking Shimizu, Japan. It has been the source for numerous discoveries of minor planet by astronomer Takeshi Urata. In 2007, the observatory was ranked 43rd in the number of asteroids discovered, with a total of 163, but has since lost its ranking, as the top 50 discovery sites have all discovered more than 400 bodies as of 2016. The International Astronomical Union's code for the observatory is 385. The asteroid 2880 Nihondaira, discovered by astronomer Tsutomu Seki is a Japanese astronomer and discoverer of minor planets and comets, born in Kōchi, Japan. Career Tsutomu Seki is the Director of the Geisei Observatory in Kōchi, and in charge of the Comet Section of the Oriental Astronomical Associatio ..., is named for this observatory. It is often called by its location, Shizuoka. See also * Minoru Kizawa References {{ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
5592 Oshima
5592 Oshima, provisional designation ', is a Veritasian asteroid from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 14 November 1990, by astronomers Kenzo Suzuki and Takeshi Urata at the Toyota Observatory, and later named after Japanese astronomer Yoshiaki Oshima. The carbonaceous C-type asteroid has a rotation period of 12.5 hours. Orbit and classification ''Oshima'' is a core member of the Veritas family (), a young family of carbonaceous asteroids, that formed approximately million years ago. The family is named after 490 Veritas and consists of nearly 1,300 members. Other members of this family include 1086 Nata and 2934 Aristophanes. This asteroid orbits the Sun in the outer main belt at a distance of 3.0–3.4 AU once every 5 years and 8 months (2,063 days; semi-major axis of 3.17 AU). Its orbit has an eccentricity of 0.07 and an inclination of 8 ° with respect to the ecliptic. The body's observati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
