18D/Perrine-Mrkos

Infobox Comet
name=18D/Perrine-Mrkos


discoverer=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
epoch=2002-09-03 (JD 2452520.5)
semimajor=3.5705 AU
perihelion=1.2872 AU
aphelion=5.8537 AU
eccentricity=0.6395
period=6.75 a
inclination=17.864°
last_p=September 10, 2002 (unobserved)
next_p= Lost

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 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 seen in 1969, but was not observed in its predicted 1975 or later appearances, and is now considered lost.

External links

* [http://cometography.com/pcomets/018d.html 18D at Kronk's Cometography]
* [http://www9.ocn.ne.jp/~comet/pcmtn/0018d.htm 18D at Kazuo Kinoshita's Comets]
* [http://www.aerith.net/comet/catalog/0018D/index.html 18D at Seiichi Yoshida's Comet Catalog]