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96P/Machholz
Comet 96P/Machholz or 96P/Machholz 1〔 is a short-period comet discovered on May 12, 1986, by amateur astronomer Donald Machholz on Loma Prieta peak, in central California using binoculars.〔〔 On June 6, 1986, comet 96P/Machholz passed from the Earth.〔 Comet 96P/Machholz last came to perihelion on July 14, 2012,〔 and will next come to perihelion on October 27, 2017.〔 96P/Machholz has an estimated radius of around .〔
Machholz 1 is unusual among comets in several respects. Its highly eccentric 5.2 year orbit has the smallest perihelion distance known among numbered/regular〔 short-period comets, bringing it considerably closer to the Sun than the orbit of Mercury. It is also the only known short-period comet with both high orbital inclination and high eccentricity.〔 In 2007, Machholz 1 was found to be both carbon-depleted and cyanogen-depleted, a chemical composition nearly unique among comets with known compositions.〔〔 The chemical composition implies a different and possible extrasolar origin.〔
== Orbit ==
The orbit of Machholz 1 corresponds to the Arietids and the Marsden and Kracht Comet groups.〔 Its Tisserand parameter with respect to Jupiter, TJ, is 1.94 and comets are generally classified as Jupiter family if TJ > 2.〔 Orbital integrations indicate that TJ was greater than 2 about 2500 years ago.〔 Machholz 1 is currently in a 9:4 orbital resonance with Jupiter.〔 96P will not make another close approach to the Earth until 2028, when it will pass at a distance of .〔
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