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2P/Encke
Classification: Encke-type Comet [NEO]          SPK-ID: 1000025
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]
Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


:
Orbital Elements at Epoch 2456870.5 (2014-Aug-01.0) TDB
Reference: JPL 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8482682513981584 3.8316e-08  
a 2.215043249413766 1.4936e-07 AU
q .3360923854622558 9.7902e-08 AU
i 11.77999525464905 5.7392e-06 deg
node 334.5698056056256 3.2002e-05 deg
peri 186.5403463055908 3.43e-05 deg
M 75.42955290429077 8.6927e-06 deg
tp 2456618.203761764900
(2013-Nov-21.70376176)
8.3901e-06 JED
period 1204.125468964159
3.30
0.00012179
3.334e-07
d
yr
n .2989721663388513 3.024e-08 deg/d
Q 4.093994113365276 2.7606e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.578015770764236E-10 1.105E-11
A2 [EST] -5.04834043704841E-12 2.03E-13
  Orbit Determination Parameters
   # obs. used (total)      2347  
   data-arc span      4047 days (11.08 yr)  
   first obs. used      2003-07-08  
   last obs. used      2014-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      1  
   fit RMS      .82503  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2014-Aug-12 07:48:48  

Additional Information
 Earth MOID = .173092 AU 
 T_jup = 3.026 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 14.1 mag 1. 74 2 parameter fit from 635 observations, autocmod 2.5c
comet total magnitude slope K1 9.   n/a 74 autocmod 2.5c
comet nuclear magnitude M2 18.0 mag 1. 74 from 1234 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 74 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 74 autocmod 2.5c
diameter diameter 4.8 km n/a Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264  
rotation period rot_per 11.083 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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)  

2P/Encke          Discovered 1786-Jan-17 by Mechain, Pierre F. A.
Reference: comet.disLast Updated: 2003-08-29

[ 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 
 1951.3       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   
 1849.1       1848 II   
 1845.8       1845 IV   
 1842.5       1842 I   
 1839.2       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   
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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