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Critical-list Minor Planet
__NOTOC__ A critical-list minor planet (''critical list numbered object'' or ''critical object'') is a numbered minor planet whose orbit and Astrometry, position is especially in need of improvement. The International Astronomical Union, IAU's Minor Planet Center (MPC) regularly publishes a list of these critical objects in their ''Minor Planet Electronic Circular''. The list typically contains asteroids that have been Observations of small Solar System bodies, observed at a small number of apparitions, especially on Opposition (astronomy), opposition, or that have not been adequately observed for more than 10 years, while other observatories create their own, customized lists. The MPC also lists currently observable critical objects on their website, providing differently formatted lists of orbital elements to the worldwide astrometric community. , the MPC includes more than a thousand objects in their critical list, half of them being either Near-Earth object, near-Earth astero ... [...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 ( |
3753 Cruithne
3753 Cruithne is a Q-type, Aten asteroid in orbit around the Sun in 1:1 orbital resonance with Earth, making it a co-orbital object. It is an asteroid that, relative to Earth, orbits the Sun in a bean-shaped orbit that effectively describes a horseshoe, and that can change into a quasi-satellite orbit. Cruithne does not orbit Earth and at times it is on the other side of the Sun, placing Cruithne well outside of Earth's Hill sphere. Its orbit takes it near the orbit of Mercury and outside the orbit of Mars. Cruithne orbits the Sun in about one Earth year, but it takes 770 years for the series to complete a horseshoe-shaped movement around Earth. The name ''Cruithne'' is from Irish and refers to the early Picts (Old Irish: ''Cruthin'') in the ''Annals of Ulster''Cruithne: Asteroid 3753 . Western Washington University Planetarium ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lost Minor Planet
A minor planet is "lost" when today's observers cannot find it, because its location is too uncertain to target observations. This happens if the orbital elements of a minor planet are not known accurately enough, typically because the observation arc for the object is too short, or too few observations were made before the object became unobservable (e.g. too faint due to increasing distance, or too close to the Sun to view at night). By some definitions thousands, if not tens of thousands, of mostly small observed minor planets are lost. Some lost minor planets discovered in decades past cannot be found because the available observational data is insufficient for reliable orbit determination. With limited information astronomers cannot know where to look for the object at future dates. Lost objects are sometimes recovered when serendipitously re-observed by a later astronomical survey. If the orbital elements of the newly found object are sufficiently close to those of the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distant Minor Planet
A distant minor planet, or ''distant object'', is any minor planet found beyond Jupiter in the outer Solar System that is not commonly thought of as an "asteroid". The umbrella term is used by IAU's Minor Planet Center (MPC), which is responsible for the identification, designation and orbit computation of these objects. , the MPC maintains 3929 distant objects in its data base. Most distant minor planets are trans-Neptunian objects and centaurs, while relatively few are damocloids, Neptune trojans or Uranus trojans. All distant objects have a semi-major axis (average distance from the Sun) greater than 6 AU. This threshold, which is just beyond the orbit of Jupiter (5.2 AU), ensures that the vast majority of "true asteroids" – such as the near-Earth, Mars-crosser, main-belt and Jupiter trojan populations – are excluded from the distant minor planets. See also * Critical-list minor planet * Unusual minor planet In planetary science, the term unusual minor plane ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20461 Dioretsa
20461 Dioretsa is a centaur and damocloid on a retrograde, cometary-like orbit from the outer Solar System. It was discovered on 8 June 1999, by members of the LINEAR team at the Lincoln Laboratory Experimental Test Site near Socorro, New Mexico, United States. The highly eccentric unusual object measures approximately in diameter. It was named ''Dioretsa'', the word "asteroid" spelled backwards. Classification and orbit ''Dioretsa'' is a member of the damocloids, with a retrograde orbit and a negative TJupiter of −1.547. It is also a centaur, as its orbit has a semi-major axis in between that of Jupiter (5.5 AU) Neptune (30.1 AU). The Minor Planet Center lists it as a critical object and (other) unusual minor planet due to an orbital eccentricity of more than 0.5. It orbits the Sun at a distance of 2.4–45.4 AU once every 116 years and 10 months (42,686 days; semi-major axis of 23.9 AU). Its orbit has an eccentricity of 0.90 and an inclination of 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19521 Chaos
19521 Chaos is a cubewano, a Kuiper-belt object not in resonance with any planet. Chaos was discovered in 1998 by the Deep Ecliptic Survey with Kitt Peak's 4 m telescope. Its albedo is , making it, with its absolute magnitude (H) of 4.8, in diameter. On 20 November 2020, Chaos occulted a magnitude 16.8 star. Three observers detected the occultation, finding that the object is likely smaller than in diameter. Another occultation was recorded on 14 January 2022; full results on size, shape, geometric albedo, and the spin-axis orientation have not been released. Name It is named after the primeval state of existence in Greek mythology, from which the first gods appeared. Planetary symbols are no longer much used in astronomy, so Chaos never received a symbol in the astronomical literature. There is no standard symbol for Chaos used by astrologers either. Michael Moorcock's Symbol of Chaos () has been used. Orbit 19521 Chaos has an orbital period of approximately 309 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
(15809) 1994 JS
Year 158 ( CLVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Tertullus and Sacerdos (or, less frequently, year 911 '' Ab urbe condita''). The denomination 158 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 * The earliest dated use of Sol Invictus, in a dedication from Rome. * A revolt against Roman rule in Dacia is crushed. China * Change of era name from ''Yongshou'' to ''Yangxi'' of the Chinese Han Dynasty. Births * Gaius Caesonius Macer Rufinianus, Roman politician (d. 237) Deaths * Wang Yi, Chinese librarian and poet (d. AD 89 AD 89 (LXXXIX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Fulvus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
(15789) 1993 SC
(15789) 1993 SC is a trans-Neptunian object of the plutino class. The discovery was made in 1993 at the La Palma Observatory with the Isaac Newton Telescope. It was the second plutino to receive an MPC number. KBO's found in 1993 include: (15788) 1993 SB, (15789) 1993 SC, (181708) 1993 FW, and (385185) 1993 RO. See also *15760 Albion *List of trans-Neptunian objects *Kuiper belt The Kuiper belt () is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times ... References External links MPC: List of TNOs* Grundy, W. M.; Noll, K. S.; Stephens, D. C. "Diverse albedos of small trans-neptunian objects." Icarus, Volume 176, Issue 1, p. 184-191 (07/2005Abstract* Plutinos 19930917 1993 SC 1993 SC 1993 SC {{centaurTNO-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
14827 Hypnos
14827 Hypnos ('' prov. designation:'' ) is a highly eccentric, sub-kilometer-sized carbonaceous asteroid that is thought to be an extinct comet. It is classified as near-Earth object and potentially hazardous asteroid of the Apollo group. The asteroid was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California on 5 May 1986. It was named after Hypnos, the Greek god of sleep. Orbit and classification ''Hypnos'' orbits the Sun at a distance of 0.9–4.7 AU once every 4 years and 9 months (1,749 days). Its orbit has a high eccentricity of 0.67 and an inclination of 2 ° with respect to the ecliptic. It is frequently perturbed by Jupiter. The body's observation arc begins at Anderson Mesa Station the night prior to its official discovery observation at Palomar. Close approaches As a near-Earth object and potentially hazardous asteroid ''Hypnos'' has an Earth minimum orbital intersection distance of , which co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
10370 Hylonome
10370 Hylonome (; '' prov. designation'': ) is a minor planet orbiting in the outer Solar System. The dark and icy body belongs to the class of centaurs and measures approximately in diameter. It was discovered on 27 February 1995, by English astronomer David C. Jewitt and Vietnamese American astronomer Jane Luu at the U.S. Mauna Kea Observatory in Hawaii, and later named after the mythological creature Hylonome. Classification and orbit Centaurs are a large population of icy bodies in transition between trans-Neptunian objects (TNOs) and Jupiter-family comets (JFCs), their orbits being unstable due to perturbations by the giant planets. Currently, Uranus controls ''Hylonome''s perihelion and Neptune its aphelion. ''Hylonome'' is a carbonaceous C-type body that orbits the Sun in the outer main-belt at a distance of 18.9–31.4 AU once every 126 years and 2 months (46,073 days). Its orbit has an eccentricity of 0.25 and an inclination of 4 ° with respect to the ec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
(8014) 1990 MF
(8014) 1990 MF is a sub-kilometer near-Earth object and potentially hazardous asteroid in the Apollo group. It was discovered by American astronomer Eleanor Helin Eleanor Francis "Glo" Helin (née Francis, 19 November 1932 – 25 January 2009) was an American astronomer. She was principal investigator of the Near-Earth Asteroid Tracking (NEAT) program of NASA's Jet Propulsion Laboratory. (Some sources gi ... at the Palomar Observatory in California on 26 June 1990. The asteroid measures approximately in diameter. On 23 July 2020, it came within 0.055 AU of the Earth—about 21 times the Moon's distance. References External links * * * {{DEFAULTSORT:1990 MF 008014 Discoveries by Eleanor F. Helin 008014 19900626 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
7066 Nessus
7066 Nessus is a very red centaur on an eccentric orbit, located beyond Saturn in the outer Solar System. It was discovered on 26 April 1993, by astronomers of the Spacewatch program at the Kitt Peak National Observatory in Tucson, Arizona. The dark and reddish minor planet is likely elongated and measures approximately in diameter. It was named after Nessus from Greek mythology. Orbit and classification ''Nessus'' is a centaur, a dynamically unstable population of minor planets between the classical asteroids and the trans-Neptunian objects. It orbits the Sun at a distance of 11.9–37.4 AU once every 122 years and 4 months (44,670 days; semi-major axis of 24.64 AU). Its orbit has an eccentricity of 0.52 and an inclination of 16 ° with respect to the ecliptic. At its perihelion (11.9 AU), it moves much closer to the Sun than Uranus (19.2 AU) but not as close as Saturn (9.6 AU), while at its aphelion (37.4 AU), it moves out well beyond the or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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