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JPL Small-Body Database Browser
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21P/Giacobini-Zinner
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000032
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2458339.5 (2018-Aug-09.0) TDB
Reference: JPL K182/10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7104635508963024 5.817e-07  
a 3.498093382740213 7.3015e-06 au
q 1.012825536671743 1.1427e-07 au
i 31.99782625732268 8.3251e-06 deg
node 195.3919874642221 1.6469e-05 deg
peri 172.8605532582592 2.9575e-05 deg
M 355.1375239233932 1.7468e-05 deg
tp 2458371.777545507917
(2018-Sep-10.27754551)
1.9713e-05 TDB
period 2389.711784650855
6.54
0.007482
2.048e-05
d
yr
n .1506457817684475 4.7166e-07 deg/d
Q 5.983361228808683 1.2489e-05 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.521477115232857E-9 1.137E-10
A2 [EST] -4.467487858539592E-10 8.907E-11
A3 [EST] -3.130227413896412E-9 6.654E-11
  Orbit Determination Parameters
   # obs. used (total)      3833  
   data-arc span      2334 days (6.39 yr)  
   first obs. used      2012-11-19  
   last obs. used      2019-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      2  
   norm. resid. RMS      .67389  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2019-May-15 16:29:39  

Additional Information
 Earth MOID = .0163525 au 
 Jupiter MOID = .24681 au 
 T_jup = 2.466 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.1   0.9 K182/10 2 parameter fit from 1367 observations, autocmod 2.6q
comet total magnitude slope K1 9.   n/a K182/10 autocmod 2.6q
diameter diameter 2.0 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

21P/Giacobini-Zinner          Discovered 1900-Dec-20 by Giacobini, M. at Nice Observatory, France
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1992.5       1992 IX   1991m 
 1986.0       1985 XIII   1984e 
 1979.4       1979 III   1978h 
 1972.9       1972 VI   1972d 
 1966.3       1966 I   1965g 
 1959.8       1959 VIII   1959b 
 1946.7       1946 V   1946c 
 1940.2       1940 I   1939l 
 1933.6       1933 III   1933c 
 1927.1       1926 VI   1926e 
 1914.0   21P/1913 U1   1913 V   1913e 
 1900.9   21P/1900 Y1   1900 III   1900c 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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