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46P/Wirtanen
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000109
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2458465.5 (2018-Dec-13.0) TDB
Reference: JPL K181/21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6587597216166052 2.1734e-07  
a 3.092705740644532 1.9746e-06 au
q 1.055355767895463 5.2694e-09 au
i 11.74759274314818 3.1571e-06 deg
node 82.15763882934478 3.4456e-06 deg
peri 356.3410943543136 6.7842e-06 deg
M .01246725115992296 7.8481e-07 deg
tp 2458465.431202202407
(2018-Dec-12.93120220)
4.3507e-06 TDB
period 1986.581229156295
5.44
0.0019025
5.209e-06
d
yr
n .1812158469618142 1.7355e-07 deg/d
Q 5.1300557133936 3.2754e-06 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.018869937057035E-9 4.8E-11
A2 [EST] -1.352227436938086E-9 4.935E-11
A3 [EST] 8.151537858252997E-10 3.163E-11
  Orbit Determination Parameters
   # obs. used (total)      4135  
   # delay obs. used      4  
   # Doppler obs. used      1  
   data-arc span      414 days (1.13 yr)  
   first obs. used      2018-05-08  
   last obs. used      2019-06-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      2  
   norm. resid. RMS      .46437  
   source      ORB  
   producer      Javier Roa  
   solution date      2020-Aug-06 09:05:10  

Additional Information
 Earth MOID = .0713354 au 
 Jupiter MOID = .169237 au 
 T_jup = 2.818 
[ 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 16.5   0.9 K181/21 2 parameter fit from 2327 observations, autocmod 2.8
comet total magnitude slope K1 4.5   n/a K181/21 autocmod 2.8
diameter diameter 1.2 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

46P/Wirtanen          Discovered 1948-Jan-15 by Wirtanen, Carl A. at Lick Observatory, California
discovered on plate/photo taken on discovery date
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1991.8       1991 XVI   1991s 
 1986.3       1986 VI   1985q 
 1975.4       1974 XI   1974i 
 1964.6       1967 XIV   1967k 
 1959.1       1961 IV   1960m 
 1953.7   46P/1954 R2   1954 XI   1954j 
 1948.2   46P/1948 A1   1947 XIII   1948b 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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