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(1998 WW31)
Classification: TransNeptunian Object          SPK-ID: 3031823
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09101879259144918 0.00016308  
a 44.47742348550198 0.014211 au
q 40.42914210227303 0.020031 au
i 6.81712171823271 0.00030293 deg
node 237.1375778556559 0.00029258 deg
peri 51.21812990523897 0.12427 deg
M 141.8474991207344 0.13377 deg
tp 2416310.412868287203
(1903-Jul-14.91286829)
20.64 TDB
period 108344.7467363219
296.63
51.928
0.1422
d
yr
n .003322726858886203 1.5925e-06 deg/d
Q 48.52570486873093 0.015505 au
  Orbit Determination Parameters
   # obs. used (total)      38  
   data-arc span      7647 days (20.94 yr)  
   first obs. used      1998-11-18  
   last obs. used      2019-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      4  
   norm. resid. RMS      .34489  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-21 21:32:43  

Additional Information
 Earth MOID = 39.4172 au 
 Jupiter MOID = 35.2636 au 
 T_jup = 5.899 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452639.5 (2002-Dec-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08181018004904995 0.00015934  
q 41.1526292025888 0.020254 au
tp 2416188.053473429463
(1903-Mar-14.55347343)
25.972 TDB
node 237.0979429848242 0.0002932 deg
peri 52.93032961252681 0.14163 deg
i 6.783280706307233 0.00030153 deg
  Orbit Determination Parameters
   # obs. used (total)      38  
   data-arc span      7647 days (20.94 yr)  
   first obs. used      1998-11-18  
   last obs. used      2019-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      4  
   norm. resid. RMS      .34489  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-21 21:32:43  

Additional Information
 Jupiter MOID = 35.2636 au 
 T_jup = 5.899 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.539022356889661E-8 -3.181991663510431E-6 -.003407849116704555 6.924381528049072E-9 -2.061310438933408E-5 5.044304170246295E-9
q -3.181991663510431E-6 .0004102299495974105 .4768786282116 -8.845394720566077E-7 .002778225611191822 -6.544341812726632E-7
tp -.003407849116704555 .4768786282116 674.5257116830388 -.001001029806830942 3.616047564946922 -.0007730941461266753
node 6.924381528049072E-9 -8.845394720566077E-7 -.001001029806830942 8.596442354338573E-8 -5.986583543304179E-6 4.33770465140539E-9
peri -2.061310438933408E-5 .002778225611191822 3.616047564946922 -5.986583543304179E-6 .02005804788107542 -4.474823469278634E-6
i 5.044304170246295E-9 -6.544341812726632E-7 -.0007730941461266753 4.33770465140539E-9 -4.474823469278634E-6 9.091946505300685E-8

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.7   n/a MPO230178  
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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