Comets in 2017

periodic comet

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

73P/Schwassmann–Wachmann, also known as Schwassmann–Wachmann 3 or SW3 for short, is a periodic comet that has a 5.4 year orbital period and that has been actively disintegrating since 1995. When it came to perihelion (closest approach to the Sun) in March 2017, fragment 73P-BT was separating from the main fragment 73P-C. Fragments 73P-BU and 73P-BV were detected in July 2022. The main comet came to perihelion on 25 August 2022, when the comet was 0.97 AU from the Sun and 1 AU from Earth. It will be less than 80 degrees from the Sun from 25 May 2022 until August 2023. On 3 April 2025 it made a

14P/Wolf is a periodic comet with an 8.78-year orbit around the Sun. It is the first of three comets discovered by German astronomer, Max Wolf.

311P/PanSTARRS, also known as P/2013 P5 (PanSTARRS), is an active asteroid and Encke-type comet discovered by Bryce T. Bolin using the Pan-STARRS telescope on 27 August 2013. Observations made by the Hubble Space Telescope revealed that it had six comet-like tails. The tails are suspected to be streams of material ejected by the asteroid as a result of a rubble pile asteroid spinning fast enough to remove material from it. This is similar to 331P/Gibbs, which was found to be a quickly-spinning rubble pile as well.

41P/Tuttle–Giacobini–Kresák is a Jupiter-family comet with a 5.43-year orbit around the Sun. Observations with the Hubble Space Telescope and dynamical modeling estimate an effective nucleus radius of , corresponding to a diameter of roughly , smaller than earlier ground-based estimates.

Comet Schaumasse is a Jupiter-family comet with an 8.2-year orbit around the Sun. It is the first of three comets discovered by French astronomer, Alexandre Schaumasse. It last came to perihelion on 8 January 2026 and will next come to perihelion on 16 March 2034.

Comet 30P/Reinmuth, also known as Comet Reinmuth 1, is a periodic comet in the Solar System. It was first discovered by Karl Reinmuth (Landessternwarte Heidelberg-Königstuhl, Germany) on February 22, 1928.

Comet 96P/Machholz, also known as Machholz 1 is a periodic sunskirting comet discovered on 12 May 1986, by amateur astronomer Donald Machholz on Loma Prieta peak, in central California using binoculars. On 6 June 1986, 96P/Machholz passed from the Earth. 96P/Machholz last came to perihelion on January 31, 2023. The comet has an estimated diameter of around .

65P/Gunn is a periodic comet in the Solar System orbiting the Sun every 6.41 years inside the main asteroid belt between the orbits of the planets Mars and Jupiter.

47P/Ashbrook–Jackson is a Jupiter-family comet with an 8.35-year orbit around the Sun. It is the only comet discovered by Joseph Ashbrook and the third and final one by Cyril V. Jackson.

{| class=wikitable style="text-align:center; font-size:11px; float:right; margin:2px" |- bgcolor= style="font-size: smaller;" | colspan="8" style="text-align:center;"|Perihelion distanceat different epochs |- ! Epoch !! Perihelion(AU) |- | 1800 || 2.45 |- | 1859 || 2.11 |- | 1882 || 2.04 |- | 1905 || 1.96 |- | 1965 || 1.49 |- | 2011 || 1.38 |- | 2023 || 1.26 |- | 2036 || 1.36 |- | 2094 || 1.21 |- | 2106 || 1.15 |}

128P/Shoemaker–Holt, also known as Shoemaker-Holt 1, is a periodic comet in the Solar System. The comet passed close to Jupiter in 1982 and was discovered in 1987. The comet was last observed in March 2018.

comet discovered in 2017

172P/Yeung is a Jupiter-family comet with a 6.59-year orbit around the Sun. It is the first of two comets discovered by Hong Kong/Canadian astronomer, William Kwong Yu Yeung.

139P/Väisälä–Oterma is a periodic comet in the Solar System. When it was discovered in 1939 it was not recognized as a comet and designated as asteroid 1939 TN.

90P/Gehrels, also known as Gehrels 1, is a Jupiter-family comet in the Solar System. The comet nucleus is about 7.8 km in diameter.

93P/Lovas, also called Comet Lovas 1, is a Jupiter-family comet with an orbital period of 9.2 years. It was discovered in 1980 by Hungarian astronomer Miklós Lovas.

comet

71P/Clark is a periodic comet in the Solar System with an orbital period of 5.5 years.

217P/LINEAR is a periodic Jupiter-family comet with an orbital period of 7.83 years. It was discovered by LINEAR on 11 July 2001.

comet, inner Oort cloud object, and Amor near-Earth object

255P/Levy, formerly P/2006 T1 and P/2011 Y1, is a Jupiter-family comet with an orbital period of 5.25 years. It last came to perihelion (closest approach to the Sun) on 14 January 2012. During the 2006 passage the comet achieved an apparent magnitude of ~9.5. Levy (PK06T010) was believed to have been recovered on 3 June 2011 at magnitude 19.8, but other observatories were unable to confirm a recovery. It was most likely a false positive because of large residuals. Levy was recovered on 17 December 2011 at magnitude 19.8, and given the second designation 2011 Y1. It was then numbered.

oort cloud comet

259P/Garradd is a Jupiter-family comet and active asteroid with an orbital period of 4.5 years. It was discovered in images obtained on 2 September 2008 as part of the Siding Spring Survey by Gordon J. Garradd.