18D/Perrine-Mrkos
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| Comet (List of comets) |
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|---|---|
| No image. | |
| Discovery | |
| Discoverer | Charles Dillon Perrine & Antonín Mrkos |
| Discovery date | December 9, 1896 |
| Alternate designations |
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| Orbital elements A | |
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| Eccentricity (e) | 0.64 |
| Semi-major axis (a) | 3.57 AU |
| Perihelion (q) | {{{perihelion}}} |
| Aphelion (Q) | {{{aphelion}}} |
| Orbital period (P) | 6.75 a |
| Inclination (i) | 17.86° |
| Last perihelion date | September 10, 2002 (unobserved) |
| Next est. perihelion date | April 17, 2009 |
18D/Perrine-Mrkos is a periodic comet in our solar system, originally discovered by the American-Argentine astronomer Charles Dillon Perrine (Lick Observatory, California, USA) on December 9, 1896.
It was considered lost after the 1909 apparition, 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 seen in 1969, but was not observed in its predicted 1975 or later appartions, and is now considered lost.
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