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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 ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2457495.5 (2016-Apr-17.0) TDB
Reference: JPL K222/1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5383287217040634 1.1489e-06  
a 3.448625946548391 1.0898e-05 au
q 1.59213154910753 1.9612e-06 au
i 3.239059426274849 1.753e-05 deg
node 136.1247786980013 0.00024864 deg
peri 41.70662901682302 0.00026417 deg
M 345.4841658360996 8.5706e-05 deg
tp 2457589.820709977779
(2016-Jul-20.32070998)
0.00019621 TDB
period 2339.201124000488
6.40
0.011089
3.036e-05
d
yr
n .1538986948605471 7.2953e-07 deg/d
Q 5.305120343989254 1.6765e-05 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.549386610147606E-9 5.961E-10
A2 [EST] -1.077609248729444E-9 1.198E-10
  Orbit Determination Parameters
   # obs. used (total)      1348  
   data-arc span      2163 days (5.92 yr)  
   first obs. used      2014-10-17  
   last obs. used      2020-09-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      3  
   norm. resid. RMS      .50537  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Sep-28 09:14:54  

Additional Information
 Earth MOID = .598381 au 
 Jupiter MOID = .0134296 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 7.9   0.9 K222/1 2 parameter fit from 288 observations, autocmod 2.9a
comet total magnitude slope K1 16.   n/a K222/1 autocmod 2.9a
comet nuclear magnitude M2 12.9   0.8 K222/1 from 1001 observations, autocmod 2.9a
comet nuclear magnitude slope K2 5.   n/a K222/1 autocmod 2.9a
comet nuclear phase coefficient PC 0.03   n/a K222/1 autocmod 2.9a
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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