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

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456717.5 (2014-Mar-01.0) TDB
Reference: JPL K073/15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6592377673949141 5.3026e-07  
a 3.087639625198431 1.3881e-06 AU
q 1.052150972162548 1.7075e-06 AU
i 11.75732764244069 2.5325e-05 deg
node 82.16308154846983 0.00011875 deg
peri 356.3388074097285 0.00030253 deg
M 42.62165449714421 0.0001617 deg
tp 2456482.879401092346
(2013-Jul-09.37940109)
0.00073368 JED
period 1981.701944780552
5.43
0.0013363
3.659e-06
d
yr
n .1816620309366782 1.225e-07 deg/d
Q 5.123128278234314 2.3032e-06 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.660092361049982E-9 1.109E-10
A2 [EST] -1.295197065844719E-9 4.426E-11
A3 [EST] 7.326477956321053E-10 6.601E-11
DT [EST] -9.684893951452532 3.558
  Orbit Determination Parameters
   # obs. used (total)      1519  
   data-arc span      4251 days (11.64 yr)  
   first obs. used      2002-06-23  
   last obs. used      2014-02-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      2  
   fit RMS      .83795  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Feb-19 14:53:17  

Additional Information
 Earth MOID = .06741 AU 
 T_jup = 2.819 
[ 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 12.7 mag 1. K073/15 2 parameter fit from 264 observations, autocmod 2.5c
comet total magnitude slope K1 14.   n/a K073/15 autocmod 2.5c
comet nuclear magnitude M2 15.9 mag 01. K073/15 from 1089 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a K073/15 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a K073/15 autocmod 2.5c
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 
 1986.4       1986 VI   1985q 
 1975.5       1974 XI   1974i 
 1964.7       1967 XIV   1967k 
 1959.3       1961 IV   1960m 
 1953.8   46P/1954 R2   1954 XI   1954j 
 1948.4   46P/1948 A1   1947 XIII   1948b 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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