|Discovered by||Charles Dillon Perrine & Antonín Mrkos|
|Discovery date||December 9, 1896|
|1896 X1; 1896 VII;|
1896g; 1909 P1;
1909 III; 1909b;
1955 U1; 1955 VII;
1955i; 1962 I;
1961h; 1968 VIII;
|Orbital characteristics A|
|Epoch||2002-09-03 (JD 2452520.5)|
|Semi-major axis||3.5705 AU|
|Orbital period||6.75 a|
|Last perihelion||2017 Feb. 26|
|Next perihelion||2025-Jan-01 (JPL Horizons)|
18D/Perrine–Mrkos is a periodic comet in the Solar System, originally discovered by the American-Argentine astronomer Charles Dillon Perrine (Lick Observatory, California, United States) on December 9, 1896. For some time it was thought to be a fragment of Biela's Comet.
It was considered lost after the 1909 appearance, but was rediscovered by the Czech astronomer Antonín Mrkos (Skalnate Pleso Observatory, Slovakia) on October 19, 1955, using ordinary binoculars, it was later confirmed as 18D by Leland E. Cunningham (Leuschner Observatory, University of California, Berkeley).
The comet was last observed during the 1968 perihelion passage when it passed 0.3144 AU (47,030,000 km; 29,230,000 mi) from the Earth. The comet has not been observed during the following perihelion passages:
- 1975 Aug. 2
- 1982 May 16
- 1989 Feb. 28
- 1995 Dec. 6
- 2002 Sept.10
- 2009 Apr. 17
- 2017 Feb. 26
- Seiichi Yoshida (2009-09-19). "18D/Perrine-Mrkos". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-22.
- Kronk, Gary W. (2001–2005). "18D/Perrine-Mrkos". Archived from the original on 6 May 2006. Retrieved 2006-06-09. (Cometography Home Page)
- "JPL Close-Approach Data: 18D/Perrine-Mrkos" (1968-12-26 last obs). Retrieved 2012-02-22.
- "18D/Perrine–Mrkos Orbit". Minor Planet Center. Retrieved 2019-02-26.
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 18D at Kronk's Cometography
- 18D at Kazuo Kinoshita's Comets
- 18D at Seiichi Yoshida's Comet Catalog
- NK 835 18D/Perrine-Mrkos – Syuichi Nakano (2002)
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