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JPL Small-Body Database Browser
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81P/Wild 2
Classification: Jupiter-family Comet          SPK-ID: 1000107
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.


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:
Orbital Elements at Epoch 2455809.5 (2011-Sep-05.0) TDB
Reference: JPL K162/9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5370707300610902 6.7506e-08  
a 3.451863526325708 9.2066e-08 au
q 1.597968662170711 2.6711e-07 au
i 3.237247549683569 2.7021e-06 deg
node 136.0976855407395 7.6059e-05 deg
peri 41.75623208556019 7.9552e-05 deg
M 85.97576116427592 9.05e-06 deg
tp 2455250.061461002294
(2010-Feb-22.56146100)
4.6752e-05 TDB
period 2342.495969932252
6.41
9.3717e-05
2.566e-07
d
yr
n .1536822281109033 6.1484e-09 deg/d
Q 5.305758390480706 1.4151e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.791197908396128E-9 5.377E-11
A2 [EST] 3.027992287262192E-11 2.95E-11
  Orbit Determination Parameters
   # obs. used (total)      4103  
   data-arc span      3257 days (8.92 yr)  
   first obs. used      2008-10-20  
   last obs. used      2017-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58329  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2018-Apr-30 14:49:35  

Additional Information
 Earth MOID = .604219 au 
 Jupiter MOID = .0126714 au 
 T_jup = 2.879 
[ 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 8.8   1. K162/9 2 parameter fit from 552 observations, autocmod 2.6n
comet total magnitude slope K1 14.   n/a K162/9 autocmod 2.6n
comet nuclear magnitude M2 13.1   0.8 K162/9 from 3263 observations, autocmod 2.6n
comet nuclear magnitude slope K2 5.   n/a K162/9 autocmod 2.6n
comet nuclear phase coefficient PC 0.03   n/a K162/9 autocmod 2.6n
diameter diameter 4.0 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

81P/Wild 2          Discovered 1978-Jan-06 by Wild, Paul at Astronomical Institute of Berne, Switzerland
discovered on plate/photo taken on discovery date as well as 1/8
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1990.9       1990 XXVIII   1989t 
 1984.5   81P/1983 S1   1984 XIV   1983s 
 1978.1   81P/1978 A2   1978 XI   1978b 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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