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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 2457375.5 (2015-Dec-19.0) TDB
Reference: JPL K103/9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5382555635420905 7.4868e-08  
a 3.448111475072858 9.9632e-08 au
q 1.592146289901568 2.2073e-07 au
i 3.239012869126441 2.7986e-06 deg
node 136.1284976439988 0.00010189 deg
peri 41.70707542640682 9.5664e-05 deg
M 327.0063173876104 9.2031e-06 deg
tp 2457589.837748887170
(2016-Jul-20.33774889)
6.6169e-05 JED
period 2338.677694935633
6.40
0.00010136
2.775e-07
d
yr
n .153933139559835 6.6718e-09 deg/d
Q 5.304076660244148 1.5326e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.630245662363438E-9 2.294E-11
A2 [EST] 4.927952000468207E-10 5.984E-12
A3 [EST] -9.407429817746153E-10 1.289E-11
DT [EST] -155.083391105896 1.709
  Orbit Determination Parameters
   # obs. used (total)      4959  
   data-arc span      7627 days (20.88 yr)  
   first obs. used      1995-01-02  
   last obs. used      2015-11-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .70583  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2015-Dec-09 11:27:54  

Additional Information
 Earth MOID = .598957 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 8.7 mag 1. K103/9 2 parameter fit from 847 observations, autocmod 2.6
comet total magnitude slope K1 14.   n/a K103/9 autocmod 2.6
comet nuclear magnitude M2 13.1 mag 0.8 K103/9 from 2770 observations, autocmod 2.6
comet nuclear magnitude slope K2 5.   n/a K103/9 autocmod 2.6
comet nuclear phase coefficient PC 0.03   n/a K103/9 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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