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JPL Small-Body Database Browser
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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 K181/20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6587595570783943 2.1759e-07  
a 3.092704238742165 1.9769e-06 au
q 1.055355764253904 5.2722e-09 au
i 11.74759116219177 3.1611e-06 deg
node 82.15764001105799 3.4482e-06 deg
peri 356.3410920516584 6.7884e-06 deg
M .01246738228891581 7.8509e-07 deg
tp 2458465.431201528916
(2018-Dec-12.93120153)
4.3523e-06 TDB
period 1986.579782049326
5.44
0.0019048
5.215e-06
d
yr
n .1812159789669405 1.7375e-07 deg/d
Q 5.130052713230428 3.2792e-06 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.037202009924027E-9 4.808E-11
A2 [EST] -1.35773964461402E-9 4.941E-11
A3 [EST] 8.087734096299872E-10 3.166E-11
  Orbit Determination Parameters
   # obs. used (total)      4125  
   # 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      .4665  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2019-Sep-03 14:40:10  

Additional Information
 Earth MOID = .0713354 au 
 Jupiter MOID = .16924 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 15.4   1. K181/20 from 2267 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 16.   n/a K181/20 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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