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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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1912-Dec-31 02:59 1_18:09 Jupiter 0.539333157804768 0.507639625674233 0.570997653467535 6.58623003073117 6.34329778514051 2419767.624596798 2529.47190912318 1565997.17753722 2556.96532832592 -7.9327625294207 3565.88681604915 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
1923-Dec-23 00:51 4_01:23 Jupiter 0.524661369650356 0.512542632337713 0.537286880464316 5.54328020336155 5.24396036791654 2423776.535399780 5843.09825616789 1039049.84351412 1202.40914954429 -55.2392536283452 23797.8923402329 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
1972-Apr-09 22:17 01:24 Jupiter 0.275955460320614 0.27472559644893 0.277185422298634 6.07377865922326 5.54544427663775 2441417.428380060 84.3887545926839 61864.1908270436 1418.48980353627 10.7999506714937 4728.2287323471 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
1984-Feb-25 21:13 04:30 Jupiter 0.465737432287056 0.463918695721728 0.467555870913965 6.3454914249021 6.05210064334665 2445756.383779237 269.845085594097 88586.9338235398 235.494966245974 -0.105948544860137 642.000335262298 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2018-Dec-16 13:05 < 00:01 Earth 0.077457322420956 0.0774573168546261 0.0774573279872902 10.0682170495121 10.0647998446594 2458469.045374635 0.00907867193191301 2.91845330899444 0.272117257520947 -89.0390958524904 5679824.98457526 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2042-Nov-25 10:52 01:49 Jupiter 0.562298034201288 0.561463331345967 0.563132704560844 6.79766211272833 6.57232781212023 2467213.953037246 108.912402202382 41032.1924795906 189.488230317649 -7.38852226712978 37491.4660984354 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2054-Nov-19 00:45 03:21 Jupiter 0.116746247065866 0.116510581635032 0.116982361550737 6.51778421902486 5.28876384435564 2471590.531091938 201.136787294104 17358.5577881285 1251.69847981726 49.5460097675766 11827.2225138661 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2090-Aug-08 15:40 2_09:34 Jupiter 1.96306243870411 1.93788669027414 1.98824846479903 10.3737626719426 10.3320855412997 2484637.152899874 3453.99652183531 1275559.50513768 4112.3116390941 -11.4600265586469 9142.1417253383 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2115-Jun-09 07:54 1_09:37 Jupiter 0.873423383605545 0.863005669835096 0.884036766678721 5.55698541269303 5.37964131202275 2493706.828842215 2016.72428641326 844965.376360782 4166.64793880607 53.5953001655335 20401.5569981943 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2151-Jan-13 13:41 07:31 Jupiter 1.33992546059026 1.33368239118718 1.34619967627538 7.43006007577682 7.34448838871326 2506709.070253038 450.654220418617 449875.000005868 562.790404154152 47.1260158690233 129286.956472345 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2161-Nov-12 21:09 1_12:25 Jupiter 1.91653215210906 1.90153015302361 1.93153529613562 10.5456602858791 10.5036678950356 2510665.380976738 2184.70884675244 751764.153015786 906.644880463379 7.7291764754726 27730.3630677834 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42
2197-Mar-15 22:11 02:26 Jupiter 0.208071397174757 0.204079561064206 0.212561787336589 6.14804410212323 5.44580514547615 2523572.424565391 146.228944314303 581147.671772154 2357.50941892969 69.967474989761 14385.4114338518 T K181/20 CATAB v2.0f-lin.ifort 2019-Sep-03 14:42:04 2019-Sep-03 14:42

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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