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75D/Kohoutek is a short-period comet discovered in February 1975, by Luboš Kohoutek.Even on the discovery plate the comet was only apparent magnitude 14. [1] Assuming the comet has not disintegrated the 2020-2021 perihelion passage is only expected to peak around apparent magnitude 20.
The comet passed 0.08318 AU (12,444,000 km; 7,732,000 mi) from Earth on February 11, 2017, which was the same day as a lunar eclipse. [16] [21] This shows the path of the comet during August 2011, with daily motion drawn as spheres, scaled for relative distance from earth. The next notable close approach to Earth will occur in October 2032 [16]
As the comet warms, parts of it sublimate; [1] this gives a comet a diffuse appearance when viewed through telescopes and distinguishes it from stars. The word coma comes from the Greek κόμη (kómē), which means "hair" and is the origin of the word comet itself. [2] [3] The coma is generally made of ice and comet dust. [1]
Comet Lulin antitail to the left, ion tail to right Comet C/2023 A3 (Tsuchinshan–ATLAS) as it appeared on October 14th 2024 with a prominent "anti-tail" pointing towards the horizon. Showing how a comet may appear to exhibit a short tail pointing in the opposite direction to its type II or dust tail as viewed from Earth i.e. an antitail
The comet was spotted with the naked eye by Piotr Guzik on 8 September at an estimated magnitude of 4.7. [10] The comet tail was up to 7.5 degrees long when imaged with CCD. [10] On 12 September 2023 the comet passed 0.84 AU (126 million km; 78 million mi; 330 LD) from Earth but was only 15 degrees from the glare of the Sun. [11]
The comet was brighter than C/2011 L4 (PanSTARRS), [citation needed] but not as bright as Hale–Bopp was in 1997. After perihelion, the comet began to fade, dropping to magnitude 2 in mid-July. [14] Its nucleus activity subdued after mid-July, and its green coma was clearly visible after that.
Contemporary 1921 illustration of Pons–Winnecke comet [6]. 7P/Pons–Winnecke (also known as Comet Pons–Winnecke) is a periodic Jupiter-family comet with a six-year orbit. . Early calculations for the 1921 apparition suggested that the orbit of the comet might collide with Earth in June, but observations on 10 April ruled out an impact
122P/de Vico (provisional designation: 1846 D1) is a periodic comet with an orbital period of 74 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). [5]