The following is a list of comets with a very high eccentricity (generally 0.99 or higher) and a period of over 1,000 years that do not quite have a high enough velocity to escape the Solar System. Often, these comets, due to their extreme semi-major axes and eccentricity, will have small orbital interactions with planets and minor planets, most often ending up with the comets fluctuating significantly in their orbital path. Some of these comets with orbital periods of millions of years come from the Oort cloud, a cloud of comets orbiting the Sun from ~10,000 to roughly 50,000 AU. The actual orbit of these comets significantly differs from the provided coordinates. A Solar System barycentric orbit computed at an epoch when the object is located beyond all the planets is a more accurate measurement of its long-term orbit.
Until the 19th century Before 1800 Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1680 V1 Kirch 9370 0.999986 444.4285 0.006222 60.6784 1680/12/18 C/1769 P1 Messier 2090 0.999249 163.4554 0.122755 40.7338 3.2 1769/10/08 C/1785 E1 Méchain 1325 0.99646 120.6893 0.42724 92.639 1785/04/08
1800 to 1849 Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1807 R1 Parisi 1710 0.995488 143.2012 0.646124 63.1762 1.6 1807/09/19 C/1811 F1 Flaugergues 3100 0.995125 212.3922 1.035412 106.9342 0.0 1811/09/12 C/1822 N1 Pons 5480 0.996316 310.8303 1.145099 127.3429 3.0 1822/10/24 C/1823 Y1 de Bréauté–Pons 2300 0.9987 170 0.2252 103.68 6.5 1823/12/09 C/1825 K1 Gambart 3870 0.996395 246.605 0.889011 123.3414 1825/05/31 C/1825 N1 Pons 4480 0.995431 271.5793 1.240846 146.4353 2.2 1825/12/11 C/1826 P1 Pons 6270 0.997492 340.063 0.852878 25.9496 1826/10/09 C/1840 B1 Galle 2430 0.99325 180.8076 1.220451 120.7807 1840/03/13 C/1844 N1 Mauvais 208900 0.999757 3520.1687 0.855401 131.4092 1844/10/17 C/1844 Y1 Great Comet of 1844 6800 0.999302 358.9355 0.250537 45.5651 1844/12/14 C/1846 B1 de Vico 2720 0.992403 194.9063 1.480703 47.4257 1846/01/22 C/1847 C1 Hind 10300 0.99991 473.2556 0.042593 48.6636 6.8 1847/03/30 C/1847 N1 Mauvais 44280 0.998589 1251.6357 1.766058 96.5817 1847/08/09 C/1849 G1 Schweizer 13560 0.998427 568.5696 0.89436 66.9587 1849/06/08
1850 to 1899 Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1850 J1 Petersen 21450 0.998599 771.8979 1.081429 68.1848 1850/07/24 C/1854 R1 Klinkerfues 1290 0.993246 118.2650 0.798762 40.9201 1854/10/28 C/1854 Y1 Winnecke–Dien 1960 0.991309 156.4219 1.359463 14.152 1854/12/16 C/1857 Q1 Klinkerfues 2460 0.996913 182.3447 0.562898 123.9614 1857/10/01 C/1858 L1 Donati 1950 0.996295 156.132 0.578469 116.9512 3.3 1858/09/30 C/1863 G1 Klinkerfues 45260 0.999159 1269.962 1.068038 112.6209 1863/04/05 C/1863 G2 Respighi 17840 0.999079 682.7155 0.628781 85.4961 1863/04/21 C/1863 V1 Tempel 15820 0.998879 630.1632 0.706413 78.0817 1863/11/09 C/1864 N1 Tempel 3930 0.996351 249.1888 0.90929 178.1269 6.2 1864/08/16 C/1864 O1 Donati–Toussaint 55240 0.999358 1450.486 0.931212 109.7124 5.2 1864/10/11 C/1871 G1 Winnecke 5180 0.997814 299.3138 0.6543 87.6034 1871/06/11 C/1871 V1 Tempel 2050 0.995714 161.2851 0.691268 98.2992 1871/12/20 C/1873 Q1 Borrelly 3390 0.996482 225.7138 0.794061 95.9662 1873/09/11 C/1873 Q2 Henry 53830 0.99973 1425.6037 0.384913 121.4625 1873/10/02 C/1874 H1 Coggia 13710 0.99882 572.6966 0.675782 66.3439 5.2 1874/07/07 C/1874 O1 Borrelly 24370 0.998831 840.5894 0.982649 41.8266 1874/08/27 C/1877 G1 Winnecke 19750 0.9987 730.7538 0.94998 121.1548 1877/04/18 C/1877 G2 Swift 10700 0.997923 485.8223 1.009053 77.1916 1877/04/27 C/1881 K1 Tebbutt 2390 0.99589 178 0.734547 63.4253 4.1 1881/06/16 C/1881 W1 Swift 2740 0.990169 195.8064 1.924973 144.8016 1881/11/20 C/1882 F1 Wells 1019140 0.999994 10127.1667 0.060763 73.7977 4.1 1882/06/11 C/1887 J1 Barnard 7640 0.996093 356.7476 1.393813 17.5479 1887/06/17 C/1888 D1 Sawerthal 2200 0.995874 169.3582 0.698772 42.2482 1888/03/17 C/1888 P1 Brooks 971160 0.999908 9806.8043 0.902226 74.1904 1888/07/31 C/1888 U1 Barnard 2400 0.991488 179.494 1.527853 56.3425 1888/09/13 C/1889 G1 Barnard 1379700 0.999818 12393.3846 2.255596 163.8517 1889/06/11 C/1889 O1 Davidson 9080 0.997611 435.2118 1.039721 65.9916 6.5 1889/07/19 C/1890 O2 Denning 61030 0.999187 1550.0898 1.260223 98.9373 1890/09/25 C/1890 V1 Zona 11040 0.995872 495.8077 2.046694 154.307 1890/08/07 C/1892 E1 Swift 23020 0.998731 809.1663 1.026832 38.7002 3.2 1892/04/07 C/1893 N1 Rordame–Quénisset 44150 0.99946 1249.1648 0.674549 159.9804 1893/07/07 C/1893 U1 Brooks 3520 0.996489 231.2706 0.811991 129.8233 1893/09/19 C/1898 V1 Chase 315460 0.999507 4634.0588 2.2846 22.5046 1898/09/20
20th century 1900s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1901 G1 Viscara 210929 0.99993 3543.398 0.245 131.08 1.7 1901/04/24 C/1902 R1 Perrine 1403170 0.999968 12533.5625 0.4011 156.3548 6.2 1902/11/24 C/1903 A1 Giacobini 43880 0.99967 1244.1242 0.4106 30.9416 8.4 1903/03/16 C/1906 B1 Brooks 84552.21 0.999327 1926.3913 1.296 126.4425 7.6 1905/12/22 C/1907 L2 Daniel 8750 0.998794 424.6874 0.512173 8.9577 4.2 1907/09/04 C/1909 L1 Borrelly–Daniel 2040 0.994762 160.9095 0.842844 52.0803 10.9 1909/06/05
1910s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1910 A1 Great Daylight Comet of 1910 4142890 0.999995 25795 0.128975 138.7812 5.2 1910/01/17 C/1910 P1 Metcalf 940030 0.999797 9596.1232 1.948013 121.0556 1910/09/16 C/1911 N1 Kiess 2500 0.9963 184 0.68383 148.42 7.6 1911/06/30 C/1911 O1 Brooks 2090 0.997005 163.1454 0.489429 16.4153589 5.4 1911/10/28 C/1911 S2 Quénisset 8910 0.998167 429.6907 0.787623 108.1 6.4 1911/11/12 C/1913 J1 Schaumasse 5436 0.995288 309.1747 1.456831 152.3673 1913/05/15 C/1913 R1 Metcalf 13100 0.99756 555.7869 1.35612 143.3547 1913/09/14 C/1914 S1 Campbell? 12350 0.998666 534.2999 0.712756 77.836 6.5 1914/08/05 C/1916 G1 Wolf 150900 0.999405 2834.363 1.686446 25.6592 1917/06/17
1920s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1920 X1 Skjellerup 2700 0.994081 193.9334 1.147892 22.0303 11.9 1920/12/11 C/1922 B1 Reid 1400 0.986968 125.0064 1.629083 32.4456 1921/10/28 C/1922 W1 Skjellerup 1790 0.993735 147.4206 0.92359 23.3659 7.5 1923/01/04 C/1924 F1 Reid 44320 0.998598 1252.2789 1.755695 72.3273 1924/03/13 C/1925 F2 Reid 6120 0.995116 334.418 1.633299 26.9797 1925/07/29 C/1926 B1 Blathwayt 2350 0.992384 176.6645 1.345477 128.2986 1926/01/02 C/1927 E1 Stearns 90990 0.998179 2023.0104 3.683902 87.6525 1927/03/22 C/1927 X1 Skjellerup–Maristany 36530 0.99984 1100.9813 0.176157 85.1126 5.2 1927/12/18 C/1929 Y1 Wilk 18190 0.999028 691.5998 0.672235 124.5103 8.4 1930/01/22
1930s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1930 D1 Peltier–Schwassmann–Wachmann 14030 0.998131 581.6554 1.087114 99.883 12.5 1930/11/15 C/1931 P1 Ryves 1180 0.999326 111.1632 0.074924 169.2881 7.0 1931/08/25 C/1936 K1 Peltier 1550 0.991775 133.7226 1.099868 78.5447 6.8 1936/06/08 C/1937 N1 Finsler 13793870 0.999985 57516 0.862744 146.4156 6.1 1937/08/15 C/1939 B1 Kozik–Peltier 1770 0.995103 146.3133 0.716496 63.5238 9.2 1939/02/06 C/1939 H1 Jurlof–Achmarof–Hassel 6460 0.998477 346.8588 0.528266 138.1212 7.1 1939/04/10 C/1939 V1 Friend 6180 0.997192 336.6129 0.945209 92.952 10.2 1939/11/05
1940s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1941 B2 de Kock–Paraskevopoulos 26100 0.999102 879.7695 0.790033 168.2039 6.0 1941/01/27 C/1942 X1 Whipple–Fedtke–Tevzadze 2280 0.992196 173.4555 1.353647 19.7127 1943/02/06 C/1944 H1 Väisälä 7140 0.9935 370.9009 2.410856 17.2882 1945/01/04 C/1947 F1 Rondanina–Bester 3210 0.997427 217.5667 0.559799 39.3015 9.1 1947/05/20 C/1947 X1-A Southern Comet of 1947 3800 0.999548 243.4336 0.110032 138.5419 6.2 1947/12/02 C/1947 X1-B Southern Comet of 1947 5110 0.999629 296.558 0.110023 138.5332 1947/12/02 C/1948 L1 Honda–Bernasconi 67700 0.999875 1661.024 0.207628 23.1489 8.0 1948/05/15 C/1948 N1 Wirtanen 242110 0.999352 3884.5787 2.517207 130.2675 1949/05/01 C/1948 V1 Eclipse Comet of 1948 95100 0.999935 2083.4 0.135421 23.117 5.5 1948/10/27 C/1948 W1 Bester 11490 0.997499 509.1675 1.273428 87.6054 6.0 1948/10/22 C/1949 N1 Bappu–Bok–Newkirk 59130 0.998644 1517.8296 2.058177 105.7686 1949/10/26
1950s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1951 P1 Wilson–Harrington 151100 0.999739 2836.8851 0.740427 152.5337 9.0 1952/01/12 C/1952 M1 Peltier 312500 0.999739 4605.0766 1.201925 45.5521 1952/06/15 C/1952 Q1 Harrington 8210 0.99591 407.0848 1.664977 59.1154 1953/01/05 C/1953 G1 Mrkos–Honda 7750 0.997391 391.7716 1.022132 93.8573 11.1 1953/05/26 C/1955 N1 Bakharev–Macfarlane–Krienke 3830 0.994167 244.7197 1.42745 50.0329 4.79 1955/07/11 C/1957 P1 Mrkos 13210 0.999365 558.9496 0.354933 93.9411 4.0 12.0 km 1957/08/01 C/1958 D1 Burnham 3534880 0.999943 23205.0702 1.322689 15.7879 1958/04/16 C/1958 R1 Burnham–Slaughter 1339380 0.999866 12150.7313 1.628198 61.2576 13.7 1959/03/11 C/1959 X1 Mrkos 350810 0.999748 4974.0634921 1.253464 19.6339 6.3 1959/11/13
1960s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1960 Y1 Candy 1080 0.9899 105.1101 1.061612 150.9552 7.9 1961/02/08 C/1961 O1 Wilson 34410 0.999962 1057.8684 0.040199 24.2116 8.0 1961/07/17 C/1961 R1 Humason 2920 0.989569 204.5261 2.133412 153.278 1.35–3.5 1962/12/10 C/1963 F1 Alcock 22300 0.99806 792.3201 1.537101 86.2194 6.6 1963/05/05 C/1964 L1 Tomita–Gerber–Honda 1360 0.995933 123.03 0.500363 161.8323 8.5 1964/06/30 C/1964 P1 Everhart 6860 0.996513 361.1342 1.259275 67.9689 6.8 1964/08/23 C/1965 S1-B Ikeya–Seki 1060 0.999925 103.7067 0.007778 141.861 1965/10/21 C/1966 P1 Kilston 236260 0.999376 3821.7115 2.384748 40.2648 5.0 1966/10/28 C/1966 P2 Barbon 37033 0.998183 1111.0435 2.018766 28.7058 5.6 1966/04/17 C/1967 Y1 Ikeya–Seki 89490 0.999152 2000.6851 1.696581 129.3153 4.0 1968/02/25 C/1968 H1 Tago–Honda–Yamamoto 2300 0.9961 174 0.680378 102.1698 9.8 1968/05/16 C/1968 Y1 Thomas 18750 0.995301 705.6891 3.316033 45.2291 5.8 1969/01/12 C/1969 O1-A Kohoutek 87080 0.999125 1964.6686 1.719085 86.3128 9.8 1970/03/21 C/1969 T1 Tago–Sato–Kosaka 508060 0.999926 6400 0.4726395 75.81773 5.1 2.2 km 1969/12/21 C/1969 Y1 Bennett 1680 0.996193 141.21513 0.537606 90.0394 4.1 3.76 km 1970/03/20
1970s Comet designation Name/ discoverer(s) Period(years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Perihelion date Ref C/1972 E1 Bradfield 11010 0.998126 494.778 0.927214 123.693 8.2 1972/03/27 C/1972 F1 Gehrels 35090 0.996943 1071.8224 3.276561 175.616 1971/01/06 C/1972 X1 Araya 12551360 0.99991 54008.3111 4.860748 113.0902 1972/12/18 C/1973 D1 Kohoutek 35600 0.998723 1082.2388 1.382019 121.5982 1973/06/07 C/1974 C1 Bradfield 67680 0.999697 1660.6964 0.503191 61.2842 8.6 5–10 km 1974/03/18 C/1974 F1 Lovas 658170 0.999602 7566.4724 3.011456 50.6485 1975/08/22 C/1975 T1 Mori–Sato–Fujikawa 15880 0.997461 632 1.603934 97.6077 5.5 1975/12/25 C/1975 V1-A West 558300 0.999971 6780.2069 0.196626 43.0664 5.6 1967/02/25 C/1976 D1 Bradfield 1600 0.993811 136.9866 0.84781 46.834 1976/02/24 C/1976 J1 Harlan 368920 0.999695 5143.859 1.568877 38.8063 1976/11/03 C/1977 R1 Kohler 101000 0.999543 2170 0.9905761 48.71188 7.3 1977/11/10 C/1977 V1 Tsuchinshan 972760 0.999633 9817.545 3.603039 168.5495 1977/06/24 C/1978 T1 Seargent 3300 0.99832 220 0.36988 67.828 7.7 1978/09/14
1980s