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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 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL K103/7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5373543238379794 5.0809e-08  
a 3.450114967981122 4.9074e-08 AU
q 1.596180772198334 1.6027e-07 AU
i 3.238287173774766 2.7039e-06 deg
node 136.1066161686843 8.501e-05 deg
peri 41.69284474711376 7.8161e-05 deg
M 171.4155019345076 7.5431e-06 deg
tp 2455249.958172392958
(2010-Feb-22.45817239)
3.2015e-05 JED
period 2340.716291177878
6.41
4.9941e-05
1.367e-07
d
yr
n .1537990748203164 3.2815e-09 deg/d
Q 5.30404916376391 7.5445e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.704162371955134E-9 2.518E-11
A2 [EST] 4.580785739610615E-10 6.176E-12
A3 [EST] -9.91813916969921E-10 1.43E-11
DT [EST] -135.2388191926564 1.811
  Orbit Determination Parameters
   # obs. used (total)      4834  
   data-arc span      6469 days (17.71 yr)  
   first obs. used      1995-01-02  
   last obs. used      2012-09-18  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .69131  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:25:53  

Additional Information
 Earth MOID = .602456 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. K103/7 2 parameter fit from 812 observations, autocmod 2.5b
comet total magnitude slope K1 14.   n/a K103/7 autocmod 2.5b
comet nuclear magnitude M2 13.1 mag 0.8 K103/7 from 2686 observations, autocmod 2.5b
comet nuclear magnitude slope K2 5.   n/a K103/7 autocmod 2.5b
comet nuclear phase coefficient PC 0.03   n/a K103/7 autocmod 2.5b
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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