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'''Non-periodic comets''' (or '''long-period comets''') are ]s that do not have confirmed observations at more than one ] passage,<ref name="non-periodic">{{cite web |title=Cometary Designation System |publisher=Minor Planet Center |url=http://www.cfa.harvard.edu/iau/lists/CometResolution.html |accessdate=2007-12-26 }}</ref> and thus generally have orbital periods of 200 years or more. They include single-apparition comets that pass through the ] only once.<ref name="SBP">{{cite web |title=Small Bodies: Profile |url=http://pds.jpl.nasa.gov/planets/special/smbod.htm |publisher=]/] Planetary Data System |accessdate=2009-04-26 }}</ref> They are on unstable near-]s that will not return to the vicinity of the ] for hundreds, thousands, or even millions<ref name="SBP"/> of years – if ever. (Some use the term ''non-periodic comet'' to refer exclusively to comets that will ''never'' return to the vicinity of the Sun.) Comets not expected to return to the inner Solar System include ], ], ], ], ], and ].


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The official names of non-periodic comets begin with a "C"; comets that have been lost or disappeared have names that begin with a "D".<ref name="non-periodic"/>

The following is a partial list of non-periodic comets that have appeared in the ]:

== After 1910 ==
{| class="wikitable sortable" style="font-size:95%;"
!Comet
!Discoverer(s) or Namesake, Date of discovery
|-
| ] (C/1956 R1, 1957 III, 1956h) || ] and ], November 8, 1956
|-
| ] (Austin) (1990 V, 1989c1) || ], December 6, 1989
|-
| ] (C/1911 S3, 1911 IV, 1911g) || ], September 29, 1911
|-
| ] (C/1969 Y1, 1970 II, 1969i) || ], December 28, 1969
|-
| ] || ], November 20, 2007
|-
| ] (Bowell) || ], February 11, 1980. Most ] comet known.
|-
| ] (C/2004 F4) || ], April 12, 2004
|-
| ] (C/1911 O1, 1911 V, 1911c) || ], July 21, 1911
|-
| ] (Catalina) || ], March 23, 1999
|-
| ] (C/1941 B2, 1941 IV, 1941c) || ], January 15, 1941 and ], January 23, 1941 Independently discovered by 7 observers from South America.<ref></ref>
|-
| ] (C/1948 V1, 1948 XI, 1948l) || First spotted during the ] total ] of November 1, 1948 (magnitude about −2)
|-
| ] (C/2010 X1) || ], December 10, 2010
|-
| ] (C/1995 O1) || ] and ], July 23, 1995 one of only five comets known to have had a negative ] (−2.7)
|-
| ] (C/1961 R1, 1962 VIII, 1961e) || ], September 1, 1961
|-
| ] (C/1996 B2) || ], January 30, 1996
|-
| ] (C/1965 S1, 1965 VIII, 1965f) || ], ], September 18, 1965
|-
| ] (C/1973 E1, 1973 XII, 1973f) || ], March 7, 1973
|-
| ] (LINEAR) || ], October 29, 2000
|-
| ] (C/2007 F1) || ], March 19, 2007
|-
| ] || ], November 27, 2011
|-
| ] (C/2007 N3) || Ye Quanzhi and Lin Chi-Sheng, ], July 11, 2007
|-
| ] (C/2004 Q2) || ], August 27, 2004
|-

| ] (Matičič) || ] (the first comet discovered in Slovenia, by Stanislav Matičič)
|-
| ] (McNaught) || ], August 7, 2006 (max. brightness −5<sup>m</sup>)
|-
| ] (McNaught) || ], September 9, 2009
|-
| ] (C/1993 Y1, 1994 XI, 1993v) || ], ] December 17, 1993
|-
| ] (C/1957 P1, 1957 V, 1957d) || ], July 29, 1957
|-
| ] (C/2001 Q4) || ], August 24, 2001
|-
| ] (C/2006 A1) || ], January 2, 2006
|-
| ] (C/1962 C1, 1962 III, 1962c, <!-- ??? -->Reitberg–Blakesen, Khokhlov <!-- what is it??? -->) || ] and ], February 4, 1962
|-
| ] (Siding Spring) || Donna Burton at ], August 25, 2007
|-
| ] (C/1927 X1, 1927 IX, 1927k) || ], November 28, 1927, and ]<!-- of La Plata, Argentina; http://cdsads.u-strasbg.fr//full/seri/AN.../0231//0000216.000.html -->, December 6, 1927
|-
| ] (C/1989 Y1, 1990 VI, 1989e<sub>1</sub>) || ] and ], December 17, 1989<!--- http://www.saguaroastro.org/content/SACNEWS/sac1990/sac.9002.pdf --->
|-
| ] (C/1947 X1, 1947 XII, 1947n) || December 7, 1947
|-
| ] || ] and ], June 20, 2006
|-
| ] (Utsunomiya–Jones) || Syogo Utsunomiya and ], November 18, 2000
|-
| ] (C/1975 V1, 1976 VI, 1975n) || ], August 10, 1975
|-
| ] (C/1970 K1, 1970 VI, 1970f) || ], May 18, 1970, ], May 21, 1970, and ], May 22, 1970
|-
| ] (C/1961 O1, 1961 V, 1961d, Drakesen, Portlock–Weinberg) || ] and ], July 23, 1961
|-
| ] (C/2009 F6) || ] and SOHO of ], March 26, 2009 (maximum apparent magnitude +8.5<sup>m</sup>)
|-
| ] (C/1997 L1) || ] (June 3, 1997) and ] (June 8, 1997 )
|}

== 1910 and earlier (chronological) ==

{| class="wikitable sortable" style="font-size:95%;"
!Comet
!Discoverer(s) or Namesake, Date of discovery
|-
| ] (]) || May 18, 44 BC (]); alternative names in Roman antiquity: ''sidus Iulium'' or ''Caesaris astrum''; absolute magnitude: −4.0, one of only five comets known to have had a negative absolute magnitude and possibly the brightest daylight comet in recorded history<ref>Flare-up on July 23–25, 44 BC (]): −4.0 (Richter model) and −9.0 (41P/Tuttle-Giacobini-Kresák model); absolute magnitude on May 26, 44 BC (China): −3.3 (Richter) and −4.4 (41P/TGK); calculated in {{cite book |last1=Ramsey |first1=John T. |last2=Licht |first2=A. Lewis |others=Contributor: Brian G. Marsden |title=The Comet of 44 B.C. and Caesar's Funeral Games.&nbsp; |accessdate=February 25, 2009 |edition=Illustrated |series=American classical studies, no. 39.&nbsp; |year=1997 |origyear= |publisher=Scholars Press.&nbsp; |location=&nbsp;Atlanta |language= |isbn=0-788-50273-5 |oclc=34640748 |doi= |id= |page= |pages=236.&nbsp; |chapter= |chapterurl= |quote= |ref= |bibcode= |laysummary= |laydate= |separator= |postscript= |lastauthoramp=}}</ref>
|-
| ] (Great Comet of 1106) || February 2, 1106. One of the ], split in two.
|-
| ] (]) (1577 I) || November 1, 1577 absolute magnitude −1.8, one of only five comets known to have had a negative absolute magnitude
|-
| ] || ], 17 December 1652 (], ])
|-
| Kirch's Comet (]) || ], November 14, 1680 (first telescopic discovery of a comet)
|-
| ]<ref></ref> || ], August 12, 1686 (], ])
|-
| ] || ], November 24, 1689 (], ])
|-
| ] || ] & ]
|-
| ] (C/1729 P1,<ref></ref> 1729, Comet Sarabat) || ], August 1, 1729 absolute magnitude −3.0, one of only five comets known to have had a negative absolute magnitude
|-
| ] (1744, Comet Klinkenberg–de Chéseaux) || ], December 9, 1743, and ], December 13, 1743 (orbit computer) became brighter than Jupiter and in March 1744 exhibited no less than six tails
|-
| ] (1747, Comet de Chéseaux) || ], August 13, 1746 absolute magnitude −0.5, one of only five comets known to have had a negative absolute magnitude
|-
| Great Comet of 1760 (], 1759 III, Parisian Comet) || January 7, 1760, approached ] to within 0.054 ] in 1758
|-
| ] (], 1770 II) || January 9, 1771
|-
| ] (], 1784) || ], December 15, 1783<!--- This was his third and last comet discovery, the first being on May 26, 1758; see http://files.chatnfiles.com/Space%20and%20Astronomy/TEXT/SPACEDIG/V16_6/V16NO694.TXT May be the same person as Pierre Évariste de Lanux Véronge (1738–1805); see http://www.delanux.com/INDEX_G.HTML --->
|-
| ] (], 1807) || ], September 9, 1807
|-
| ] (]) || ], March 25, 1811
|-
| ] (], 1819 II, Comet Tralles) || ], July 1, 1819
|-
| ] (], 1823) || December 24, 1823
|-
| ] (], 1825 IV) || ], July 18, 1825
|-
| ] (], 1830 I) || ], March 16, 1830 (]) and ], March 20, 1830 (], ]). ], March 18, 1830 (])<ref></ref><ref></ref>
|-
| Great Comet of 1831 (], 1830 II) || ], January 7, 1831 ()
|-
| ] (], 1843 I) || February 5, 1843
|-
| ] (], 1844 III) || December 17, 1844
|-
| ] (], 1845 III) || June 2, 1845
|-
| ] (], 1847 I) || ], February 6, 1847
|-
| ] (], 1847 VI) || ], October 1, 1847
|-
| ] (], 1853 III) || ], June 11, 1853
|-
| ] (], 1854 II) || March 23, 1854
|-
| ] (], 1858 VI) || ], June 2, 1858
|-
| ] (], 1860 III) || June 18, 1860
|-
| ] (]) || ] of ], April 5, 1861
|-
| ] (], 1861 II) || ], May 13, 1861
|-
| ] (], 1865 I) || January 17, 1865
|-
| ] (], 1874 III) || ], April 17, 1874
|-
| ] (], 1880 I) || February 1, 1880
|-
| ] (], 1881 III, 1881b) || ], May 22, 1881. Independent discovery for W. G. Davis, May 25, 1881.<ref></ref>
|-
| ] (], 1882 I, 1882a) || ], March 18, 1882
|-
| ] (], 1882 II, 1882b) || September 1, 1882; the first astronomer to see it was ]. It reached an estimated magnitude −17 (C/1882 R1, ] (du Toit) and ] may be the fragments of ]). Possible first discoverer B. A. Gould
|-
| ] (], 1887 I, 1887a) || ], January 18, 1887, "The Headless Wonder"<ref></ref>
|-
| ] (], 1901 I, 1901a) || April 23, 1901<!--- Allegedly "Viscara" on April 12, 1901. Viscara was apparently an administrator of some sort in Paysandú, Uruguay, and a Lorenzo Kropp on May 25 wrote a letter to the Astronomische Nachrichten concerning this alleged observation. --->
|-
| ] (])<br/>(not to be confused with the 1910 apparition of ]) || Observed by many on the morning of January 12, 1910, the first astronomer to see it was ]
|}

== See also ==
* ]

== Notes ==
{{Reflist}}

== External links ==
* by J. Bortle
*
*

{{Comets}}

{{DEFAULTSORT:Non-Periodic Comets}}
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