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81P/Wild 2
Classification: Jupiter-family Comet          SPK-ID: 1000107
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456978.5 (2014-Nov-17.0) TDB
Reference: JPL K103/8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5380434533956898 5.0362e-08  
a 3.448547391975779 4.9039e-08 AU
q 1.593079043998431 1.588e-07 AU
i 3.239043597517584 2.7101e-06 deg
node 136.1250968664513 8.5355e-05 deg
peri 41.68675738457102 7.878e-05 deg
M 265.9016154674808 9.2651e-06 deg
tp 2457589.909794632178
(2016-Jul-20.40979463)
7.2205e-05 JED
period 2339.121199169129
6.40
4.9895e-05
1.366e-07
d
yr
n .1539039533855169 3.2828e-09 deg/d
Q 5.304015739953126 7.5425e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.706640289332806E-9 2.486E-11
A2 [EST] 4.572818950065555E-10 6.178E-12
A3 [EST] -1.028357759903344E-9 1.436E-11
DT [EST] -134.7219811046318 1.757
  Orbit Determination Parameters
   # obs. used (total)      4843  
   data-arc span      7235 days (19.81 yr)  
   first obs. used      1995-01-02  
   last obs. used      2014-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .67937  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Nov-07 12:37:12  

Additional Information
 Earth MOID = .598612 AU 
 T_jup = 2.879 
[ 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 8.6 mag 1. K103/8 2 parameter fit from 816 observations, autocmod 2.6
comet total magnitude slope K1 14.   n/a K103/8 autocmod 2.6
comet nuclear magnitude M2 13.1 mag 0.8 K103/8 from 2689 observations, autocmod 2.6
comet nuclear magnitude slope K2 5.   n/a K103/8 autocmod 2.6
comet nuclear phase coefficient PC 0.03   n/a K103/8 autocmod 2.6
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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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