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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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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.


:
Orbital Elements at Epoch 2458063.5 (2017-Nov-06.0) TDB
Reference: JPL K182/14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7104667848114644 1.1035e-07  
a 3.500440355594361 1.4936e-07 au
q 1.013493750730936 3.8212e-07 au
i 32.00303376160798 7.8449e-06 deg
node 195.4051449504903 2.4242e-05 deg
peri 172.8091596458073 3.856e-05 deg
M 313.6078040371743 4.9611e-06 deg
tp 2458371.765469259133
(2018-Sep-10.26546926)
3.1757e-05 TDB
period 2392.117178980126
6.55
0.00015311
4.192e-07
d
yr
n .1504942998459153 9.6324e-09 deg/d
Q 5.987386960457786 2.5548e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 3.112315962436393E-9 7.205E-11
A2 [EST] -1.846484272530308E-9 4.37E-11
A3 [EST] -1.813721411728888E-9 4.229E-11
  Orbit Determination Parameters
   # obs. used (total)      1987  
   data-arc span      3196 days (8.75 yr)  
   first obs. used      2011-05-01  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50573  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-Mar-23 23:52:51  

Additional Information
 Earth MOID = .0178922 au 
 Jupiter MOID = .248335 au 
 T_jup = 2.465 
[ 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 K182/14 2 parameter fit from 1428 observations, autocmod 2.9b
comet total magnitude slope K1 8.5   n/a K182/14 autocmod 2.9b
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 
 1985.9       1985 XIII   1984e 
 1979.4       1979 III   1978h 
 1972.8       1972 VI   1972d 
 1966.3       1966 I   1965g 
 1959.7       1959 VIII   1959b 
 1946.6       1946 V   1946c 
 1940.1       1940 I   1939l 
 1933.5       1933 III   1933c 
 1927.0       1926 VI   1926e 
 1913.9   21P/1913 U1   1913 V   1913e 
 1900.8   21P/1900 Y1   1900 III   1900c 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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