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Comet Hartley (other)
Comet Hartley is the name of ten comets discovered by Malcolm Hartley: * 79P/du Toit–Hartley * 80P/Peters–Hartley * 100P/Hartley or Hartley 1 * 103P/Hartley or Hartley 2 * 110P/Hartley or Hartley 3 * 119P/Parker–Hartley * 161P/Hartley–IRAS * C/1984 W2 (Hartley) * C/1985 R1 (Hartley–Good) * X/1987 A2 (McNaught–Hartley), later rediscovered as 449P/Leonard * C/1995 Q2 (Hartley–Drinkwater) * C/1999 T1 (McNaught–Hartley) See also * Hartley (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malcolm Hartley
Malcolm Hartley ælkəm hɑːtli(born 15 February 1947, Bury, Greater Manchester) is an English-born astronomer and a discoverer of minor planets and comets, who works with the UK Schmidt Telescope at the Siding Spring Observatory in Australia. Career Hartley is best known for his discovery and co-discovery of 10 comets since the 1980s, among them 79P/du Toit-Hartley, 80P/Peters–Hartley, 100P/Hartley, 110P/Hartley, and C/1984 W2. Unfortunately for Hartley, in 2002, "the Anglo-Australian Observatory retrofitted its Schmidt to perform multi-object spectroscopy, essentially halting all astrophotography with the telescope and ending any future possibility for comet discovery". In November 2010, he visited NASA's Jet Propulsion Laboratory facility in California to witness the '' EPOXI'' mission flyby of comet 103P/Hartley on 4 November 2010. Hartley is credited by the Minor Planet Center with the discovery of 3 asteroids made at the Siding Spring Observatory between 1996 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
79P/du Toit–Hartley
79P/du Toit–Hartley or du Toit 2 is a periodic comet, now divided into two parts, in the Solar System with an orbital period of 5.06 years. Its most recent perihelion was reached on 30 September 2023. It was about from the Sun and Earth on 26 May 2024. Observational history It was originally discovered by Daniel du Toit at the Boyden Observatory, Bloemfontein, South Africa (then administered by Harvard College) on 9 April 1945 with a brightness of apparent magnitude 10. Uncertainties in the calculation of the orbit meant the comet was lost until rediscovered by Malcolm Hartley of the UK Schmidt Telescope Unit, Siding Spring, Australia in 1982, when it was found to have broken into two parts, probably in 1976. Both parts had a brightness of magnitude 17. Observed in 1987, it was missed in 1992 but rediscovered by astronomers at Los Molinos Observatory, Uruguay on 4 March 2003 at magnitude 17. Fragment 79P-B is lost as it only has a 23-day observation arc from 1982. See a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
80P/Peters–Hartley
80P/Peters–Hartley is a periodic comet in the Solar System with an orbital period of 8.12 years. It was originally discovered by Christian Heinrich Friedrich Peters of Capodimonte Observatory, Naples, Italy. There was insufficient data to accurately compute the orbit, and the comet was lost for well over a hundred years. It was accidentally rediscovered by Malcolm Hartley at the UK Schmidt Telescope Unit, Siding Spring, Australia on a photographic plate exposed on 11 July 1982. He estimated its brightness at a magnitude of 15. The sighting was confirmed by the Perth Observatory, where M. C. Candy calculated the orbit and concluded that Hartley had indeed relocated the lost Peter's comet. I. Hasegawa and Syuichi Nakano had simultaneously reached the same conclusion. It was observed at its next apparition in 1990 by R. H. McNaught of the Siding Spring observatory, who described as diffuse with a brightness of magnitude 14. It was subsequently observed in 1998, 2006 and 2014. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
100P/Hartley
100P/Hartley, also known as Hartley 1, is a periodic, Jupiter family comet in the Solar System. On 29 April 2164, the comet will pass from Earth. Observational history Discovery Malcolm Hartley discovered the comet from CCD images taken from the UK Schmidt Telescope in Australia on 13 June 1985. At the time, the comet was a 16th-magnitude object within the constellation Virgo, with a prominent tail extending about 1 arcminute towards the southeast. Despite the discovery announcement, Hartley remained the comet's only observer for the next three weeks. Follow-up observations An additional observation by Hartley on 10 July 1985 has allowed Brian G. Marsden to compute the elliptical orbit of the comet for the first time, revealing that it was a short-period comet with a 5.66-year orbit around the Sun. James B. Gibson obtained the only known Northern hemisphere observations of the comet during its first apparition on 27–29 July 1985. It was last detected by Alan C. Gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
103P/Hartley
Comet Hartley 2, designated as 103P/Hartley by the Minor Planet Center, is a small periodic comet with an orbital period of 6.48 years. It was discovered by Malcolm Hartley in 1986 at the Schmidt Telescope Unit, Siding Spring Observatory, Australia. Its diameter is estimated to be Hartley 2 was the target of a flyby of the '' Deep Impact'' spacecraft, as part of the EPOXI mission, on 4 November 2010, which was able to approach within of Hartley 2 as part of its extended mission. Hartley 2 is the smallest comet which has been visited. It is the fifth comet visited by spacecraft, and the second comet visited by the Deep Impact spacecraft, which first visited comet Tempel 1 on 4 July 2005. Discovery and orbit Comet Hartley 2 is a small Jupiter-family comet having an orbital period of 6.46 years. It was discovered by Malcolm Hartley in 1986 at the Schmidt Telescope Unit, Siding Spring Observatory, Australia. It has the perihelion near the Earth's orbit at from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
110P/Hartley
Comet Hartley 3 is a periodic comet with a six-year orbit around the Sun. It is one of ten comets discovered by Australian astronomer, Malcolm Hartley. Observational history Discovery The comet appeared as a weak trail at magnitude 16.5 on the edge of its discovery plates, which were taken from the UK Schmidt Telescope of the Siding Spring Observatory. By 22 February, Hartley confirmed his discovery using the same telescope, and found a tail about 10 arcminutes in length. From the Palomar Observatory, both Carolyn and Eugene Shoemaker found two precovery images of the comet about 4.8 hours before its official discovery. By then, it was determined that Hartley's find is definitely a short-period comet. Follow-up observations Six observatories around the globe made observations of Hartley 3 in March 1988, including those made by Tsutomu Seki, Robert H. McNaught, James V. Scotti, and David H. Levy. By April 1988, revised orbital calculations by Brian G. Marsden indicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
119P/Parker–Hartley
119P/Parker–Hartley is a periodic comet in the 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 "Sola .... Around 16 March 2161, the comet will pass about from Jupiter. References External links Orbital simulationfrom JPL (Java) Horizons Ephemeris– Seiichi Yoshida @ aerith.net Periodic comets 0119 Discoveries by Malcolm Hartley 119P 19890302 {{comet-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
161P/Hartley–IRAS
161P/Hartley–IRAS is a periodic comet with an orbital period of 21 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). This was one of six comets discovered by the infrared space telescope IRAS
The Infrared Astronomical Satellite (Dutch language, Dutch: ''Infrarood Astronomische Satelliet'') (IRAS) was the first space telescope to perform a astronomical survey, survey of the entire night sky at infrared wavelengths. Launched on 25 Janu ... , in 1983.
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X/1987 A2 (McNaught–Hartley)
449P/Leonard is a periodic comet that orbits the Sun once every 6.83 years. Studies in 2022 show that 449P was a rediscovery of a previously lost comet that was spotted in 1987. Discovery and observations On 29 September 2020, Gregory J. Leonard discovered a new comet about 21.5 in apparent magnitude from images taken from the telescope of the Mount Lemmon Observatory. Orbital calculations showed it had reached its most recent perihelion on 23 November 2020, and it has frequent close passes with Jupiter, where the comet had passed about from the giant planet in 1983, reducing its orbital period from 13.2 years to just 6.82 years. In 2022, Maik Meyer linked 449P with the previously lost comet, X/1987 A2, which was discovered by Robert H. McNaught and Malcolm Hartley from the Siding Spring Observatory on 5 January 1987. This precovery In astronomy, precovery (short for pre-discovery recovery) is the process of finding the image of a celestial object in images or photogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
