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Quasi-Hilda Comet
A quasi-Hilda comet (QHC) is a Jupiter-family comet that interacts strongly with Jupiter and undergoes extended temporary capture by it. These comets are associated with the Hilda asteroid zone in the 3:2 inner mean-motion resonance with Jupiter. Typically, asteroids in this zone have a semimajor axis between 3.70 and 4.20 astronomical unit, AU, Orbital eccentricity, eccentricities below 0.30, and inclinations of no more than 20°. Comets can be temporarily Perturbation (astronomy), perturbed into this group and then perturbed back out again. Eight percent of the comets that leave the 3:2 resonance end up Impact event, impacting Jupiter. Known quasi-Hilda comets These numbered comets belong to the group of quasi-Hilda comet: 39P/Oterma was a quasi-Hilda before a close approach to Jupiter in 1963. 77P/Longmore falls outside of the bulk distribution because of its large eccentricity and inclination. Comet Shoemaker–Levy 9 impacted with Jupiter in 1994. Not numbered comets claimed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jupiter-family Comet
A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or Coma (cometary), coma, and sometimes also a Comet tail, tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently bright, a comet may be seen from Earth without the aid of a telescope and may Subtended angle, subtend an arc of 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures and religions. Comets usually have highly Orbital eccentricity, eccentric elliptical orbits, and they have a wide range of orbit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
129P/Shoemaker–Levy
129P/Shoemaker–Levy, also known as Shoemaker–Levy 3, is a periodic comet in the Solar System. It fits the definition of an Encke-type comet with ( TJupiter > 3; a < aJupiter), and is a quasi-Hilda comet. This comet should not be confused with (D/1993 F2), which spectacularly crashed into Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but slightly less ...
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Comet Shoemaker–Levy 9
Comet Shoemaker–Levy 9 ( formally designated D/1993 F2) broke apart in July 1992 and collided with Jupiter in July 1994, providing the first direct observation of an extraterrestrial collision of Solar System objects. This generated a large amount of coverage in the popular media, and the comet was closely observed by astronomers worldwide. The collision provided new information about Jupiter and highlighted its possible role in reducing space debris in the inner Solar System. The comet was discovered by astronomers Carolyn and Eugene M. Shoemaker and David Levy in 1993. Shoemaker–Levy 9 (SL9) had been captured by Jupiter and was orbiting the planet at the time. It was located on the night of March 24 in a photograph taken with the Schmidt telescope at the Palomar Observatory in California. It was the first active comet observed to be orbiting a planet, and had probably been captured by Jupiter around 20 to 30 years earlier. Calculations showed that its unusual fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
77P/Longmore
77P/Longmore is a periodic comet in the Solar System, with a period of 6.8 years. It was discovered by Andrew Jonathan Longmore on a photographic plate taken on 10 June 1975 at the 1.22m Schmidt telescope at Siding Spring Observatory, New South Wales, Australia. Its brightness was estimated at an apparent magnitude of 17. After further observations Brian G. Marsden was able to calculate the perihelion date at 4 November 1975 and the orbital period as 6.98 years. The next perihelion date was computed to be 21 October 1981. T. Seki of Geisei, Japan relocated the comet on 2 January 1981 with a brightness of magnitude 18. It has since been observed in 1988, 1995, 2002 and 2009. On 17 October 1963 the comet had passed from Jupiter. During the 2023 perihelion passage the comet brightened to about apparent magnitude 14–15. See also *List of numbered comets This is a list of periodic comets that were numbered by the Minor Planet Center after having been observed on at least two ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
39P/Oterma
39P/Oterma is a currently inactive List of periodic comets, periodic comet with an orbital period of nearly 20 years that stays outside the orbit of Jupiter. The comet nucleus, nucleus has a diameter around 4–5 km. It was last observed in August 2021 and came to perihelion in July 2023 while 1.2 Astronomical unit, AU from Jupiter. It will finish the modest 39P/Oterma#CA2025, approach to Jupiter in January 2025 and will next come to perihelion in July 2042 at distance of 5.9 AU from the Sun. Opposition (astronomy), Opposition will occur on 11 November 2023. Discovery The comet was discovered by Liisi Oterma at Iso-Heikkilä Observatory, Turku University Observatory, Finland on a photo plate on 8 April 1943 as a faint object of 15th Apparent magnitude, magnitude in the constellation of Virgo (constellation), Virgo. Its orbit was calculated by Leland Cunningham, L. E. Cunningham and R. N. Thomas who derived an orbit with a small Orbital eccentricity, eccentricity, a Apsis, perihel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
(323137) 2003 BM80
, ''provisional designation'': and cometary designation , is an asteroid and main-belt comet from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 31 January 2003, by astronomers of the LONEOS program conducted at Anderson Mesa Station near Flagstaff, Arizona, in the United States. Orbit and classification is a main-belt comet with a Jupiter Tisserand's parameter of 2.99. It orbits the Sun in the outer asteroid belt at a distance of 3.4–5.1 AU once every 8 years and 9 months (3,199 days; semi-major axis of 4.25 AU). Its orbit has an eccentricity of 0.19 and an inclination of 6 ° with respect to the ecliptic. The body's observation arc begins with its first precovery observation by the NEAT program in December 2001, more than a year prior to its official discovery observation at Anderson Mesa. In 2022 a team from Northern Arizona University determined that is a Quasi-Hilda Object with a sustained activity outburst, las ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
(457175) 2008 GO98
, provisional designation with cometary number 362P, is a Jupiter family comet in a quasi-Hilda orbit within the outermost regions of the asteroid belt. It was discovered on 8 April 2008, by astronomers of the Spacewatch program at Kitt Peak National Observatory near Tucson, Arizona, in the United States. This presumably carbonaceous body has a diameter of approximately and rotation period of 10.7 hours. Orbit and classification is classified as a member of the dynamical Hilda group, as well as a Jupiter family that shows clear cometary activity, which has also been described as a "quasi-Hilda comet". Orbital backward integration suggests that it might have been a centaur or trans-Neptunian object that ended its dynamical evolution as a quasi-Hilda comet. It may have reached the belt during the last few hundred years. It orbits the Sun in the outer asteroid belt at a distance of 2.9–5.1 AU once every 7 years and 11 months (2,883 days; semi-major axis of 3.96 A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
212P/NEAT
This is a list of periodic comets that were numbered by the Minor Planet Center after having been observed on at least two occasions. Their orbital periods vary from 3.2 to 366 years. there are 436 numbered comets (1P–436P), most of them being members of the Jupiter-family (JFC). There are also 31 Encke-type comets (ETCs), 14 Halley-type comets (HTCs), five Chiron-type comets (CTCs), and one long-period comet ( 153P). About a third of these bodies are also near-Earth comets (NECs). In addition, eight numbered comets are principally classified as minor planets – five main-belt comets, two centaurs (CEN), and one Apollo asteroid – and display characteristics of both an asteroid and a comet. Occasionally, comets will break up into multiple chunks, as volatiles coming off the comet and rotational forces may cause it to break into two or more pieces. An extreme example of this is 73P/Schwassmann–Wachmann, which broke into over 50 pieces during its 1995 perihelion. For a lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
246P/NEAT
246P/NEAT is a periodic comet discovered on 2004 March 28 by Near-Earth Asteroid Tracking (NEAT) using the reflector at Haleakala. It was given the permanent number 246P on 2011 January 14. It is a Quasi-Hilda comet. Due to perturbations by Jupiter, the 2005, 2013 and 2021 perihelion passages will be closer to the Sun. The comet is observable all through its orbit. References External links Orbital simulationfrom JPL (Java) Horizons Ephemeris– Seiichi Yoshida @ aerith.net Elements and Ephemeris for 246P/NEAT– Minor Planet Center 246P/NEATat 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. Function ...'s Database 246P/NEAT– Kazuo Kinoshita (2011 Dec. 22) Periodic comets 0246 # 20040328 {{Comet-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
231P/LINEAR-NEAT
This is a list of periodic comets that were numbered by the Minor Planet Center after having been observed on at least two occasions. Their orbital periods vary from 3.2 to 366 years. there are 436 numbered comets (1P–436P), most of them being members of the Jupiter-family (JFC). There are also 31 Encke-type comets (ETCs), 14 Halley-type comets (HTCs), five Chiron-type comets (CTCs), and one long-period comet ( 153P). About a third of these bodies are also near-Earth comets (NECs). In addition, eight numbered comets are principally classified as minor planets – five main-belt comets, two centaurs (CEN), and one Apollo asteroid – and display characteristics of both an asteroid and a comet. Occasionally, comets will break up into multiple chunks, as volatiles coming off the comet and rotational forces may cause it to break into two or more pieces. An extreme example of this is 73P/Schwassmann–Wachmann, which broke into over 50 pieces during its 1995 perihelion. For a lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
228P/LINEAR
This is a list of periodic comets that were numbered by the Minor Planet Center after having been observed on at least two occasions. Their orbital periods vary from 3.2 to 366 years. there are 436 numbered comets (1P–436P), most of them being members of the Jupiter-family (JFC). There are also 31 Encke-type comets (ETCs), 14 Halley-type comets (HTCs), five Chiron-type comets (CTCs), and one long-period comet ( 153P). About a third of these bodies are also near-Earth comets (NECs). In addition, eight numbered comets are principally classified as minor planets – five main-belt comets, two centaurs (CEN), and one Apollo asteroid – and display characteristics of both an asteroid and a comet. Occasionally, comets will break up into multiple chunks, as volatiles coming off the comet and rotational forces may cause it to break into two or more pieces. An extreme example of this is 73P/Schwassmann–Wachmann, which broke into over 50 pieces during its 1995 perihelion. For a lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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