| Discovery | |
|---|---|
| Discovered by | Charles Dillon Perrine & Antonín Mrkos |
| Discovery date | December 9, 1896 |
| Designations | |
| 1896 X1; 1896 VII; 1896g; 1909 P1; 1909 III; 1909b; 1955 U1; 1955 VII; 1955i; 1962 I; 1961h; 1968 VIII; 1968h | |
| Orbital characteristics | |
| Epoch | 2002-09-03 ( JD 2452520.5) |
| Aphelion | 5.8537 AU |
| Perihelion | 1.2872 AU |
| Semi-major axis | 3.5705 AU |
| Eccentricity | 0.6395 |
| Orbital period | 6.75 a |
| Inclination | 17.864° |
| Last perihelion | 2017 Feb. 26?
[1] (unobserved) |
| Next perihelion | ≈2025-Jan-01?
[1]
[2] ( Lost since 1969) [3] |
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. [4]
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. [5] The comet has not been observed during the following perihelion passages: [1]
- 1975 Aug. 2
- 1982 May 16
- 1989 Feb. 28
- 1995 Dec. 6 (apmag 19?)
- 2002 Sept.10 (apmag 20?)
- 2009 Apr. 17 (apmag 24?)
- 2017 Feb. 26 (apmag 24?)
The next predicted perihelion passage would be on 2025-Jan-01 [1] [2] but the comet is currently considered lost as it has not been seen since Jan 1969. [3]
References
- ^ a b c d Seiichi Yoshida (2009-09-19). "18D/Perrine-Mrkos". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-22.
- ^ a b "Horizons Batch for 18D/Perrine-Mrkos (90000290) on 2025-Jan-01" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-02-11. (JPL#J682/18 Soln.date: 2002-Feb-22)
- ^ a b "18D/Perrine–Mrkos Orbit". Minor Planet Center. Retrieved 2019-02-26.
-
^
Kronk, Gary W. (2001–2005).
"18D/Perrine-Mrkos". Archived from the original on 2001-04-05. Retrieved 2006-06-09.
{{ cite web}}: CS1 maint: bot: original URL status unknown ( link)() - ^ "JPL SBDB: 18D/Perrine-Mrkos" (1968-12-26 last obs). Archived from the original on 2020-11-14.
External links
- 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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