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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
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Orbital Elements at Epoch 2457169.5 (2015-May-27.0) TDB
Reference: JPL K204/7 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .8483368775105355 | 5.4479e-08 | |
| a | 2.215146149642885 | 5.9836e-08 | au |
| q | .3359559818253545 | 1.217e-07 | au |
| i | 11.78188260983904 | 8.4301e-06 | deg |
| node | 334.5678497042952 | 3.9948e-05 | deg |
| peri | 186.545200132077 | 3.9748e-05 | deg |
| M | 164.7858775716176 | 6.0807e-06 | deg |
| tp | 2456618.286947430470
(2013-Nov-21.78694743) | 1.1431e-05 | TDB |
| period | 1204.209376733684
3.30 | 4.8793e-05
1.336e-07 | d
yr |
| n | .2989513343406025 | 1.2113e-08 | deg/d |
| Q | 4.094336317460416 | 1.106e-07 | au |
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Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A1 [EST] | -2.347698206862334E-11 | 2.789E-11 |
| A2 [EST] | 2.590792069824862E-14 | 3.449E-13 |
| A3 [EST] | 3.852926272904644E-9 | 1.682E-10 |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| comet total magnitude |
M1 |
15.2 |
|
0.9 |
K204/7 |
2 parameter fit from 650 observations, autocmod 2.8 |
| comet total magnitude slope |
K1 |
4.75 |
|
n/a |
K204/7 |
autocmod 2.8 |
| diameter |
diameter |
4.8 |
km |
n/a |
Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264 |
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| rotation period |
rot_per |
11.083 |
h |
n/a |
LCDB (Rev. 2019-August); Warner et al., 2009 |
Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Fernandez, Y.R.; Lowry, S.C.; Weissman, P.R.; Mueller, B.E.A.; et al. (2005) Icarus 175, 194-214.]
[Lowry, S.C.; Weissman, P.R. (2007) Icarus 188, 212-223.] |
| geometric albedo |
albedo |
0.046 |
|
0.023 |
Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002) |
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| 2P/Encke Discovered 1786-Jan-17 by Mechain, Pierre F. A. |
| Reference: comet.dis | Last Updated: 2003-08-29 |
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[ show close-approach data ]
Alternate Designations
Perihelion
Year (est.) | New-Style
Desig | Roman
Numeral | Year/
Letter | | 1994.1 | | 1994 V | |
| 1990.8 | | 1990 XXI | |
| 1987.5 | | 1987 XIII | |
| 1984.2 | | 1984 VI | |
| 1980.9 | | 1980 XI | |
| 1977.6 | | 1977 XI | |
| 1974.3 | | 1974 V | |
| 1971.0 | | 1971 II | 1970l |
| 1967.7 | | 1967 XIII | 1967h |
| 1964.4 | | 1964 IV | 1963h |
| 1961.1 | | 1961 I | 1960i |
| 1957.8 | | 1957 VIII | 1957c |
| 1954.5 | | 1954 IX | 1953f |
| 1951.2 | | 1951 III | 1950e |
| 1948.0 | | 1947 XI | 1947i |
| 1941.4 | | 1941 V | 1941b |
| 1938.1 | | 1937 VI | 1937h |
| 1934.8 | | 1934 III | 1934a |
| 1931.5 | | 1931 II | 1931a |
| 1928.2 | | 1928 II | 1927h |
| 1924.9 | | 1924 III | 1924b |
| 1921.6 | | 1921 IV | 1921d |
| 1918.3 | | 1918 I | 1917c |
| 1915.0 | | 1914 VI | 1914d |
| 1911.7 | | 1911 III | 1911d |
| 1908.4 | | 1908 I | 1908b |
| 1905.1 | | 1905 I | 1904b |
| 1901.8 | | 1901 II | 1901b |
| 1898.5 | | 1898 III | 1898d |
| 1895.2 | | 1895 I | 1894d |
| 1891.9 | | 1891 III | 1891c |
| 1888.6 | | 1888 II | 1888b |
| 1885.3 | | 1885 I | 1884d |
| 1882.0 | | 1881 VII | 1881d |
| 1878.7 | | 1878 II | 1878c |
| 1875.4 | | 1875 II | 1875a |
| 1872.1 | | 1871 V | 1871c |
| 1868.8 | | 1868 III | |
| 1865.5 | | 1865 II | |
| 1862.2 | | 1862 I | |
| 1858.9 | | 1858 VIII | |
| 1855.6 | | 1855 III | |
| 1852.3 | | 1852 I | |
| 1849.0 | | 1848 II | |
| 1845.7 | | 1845 IV | |
| 1842.4 | | 1842 I | |
| 1839.1 | | 1838 | |
| 1835.9 | | 1835 II | |
| 1832.6 | | 1832 I | |
| 1829.3 | | 1829 | |
| 1826.0 | | 1825 III | |
| 1822.7 | 2P/1822 L1 | 1822 II | |
| 1819.4 | 2P/1818 W1 | 1819 I | |
| 1806.2 | 2P/1805 U1 | 1805 | |
| 1796.3 | 2P/1795 V1 | 1795 | |
| 1786.4 | 2P/1786 B1 | 1786 I | |
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