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120972 (1998 WE4)
Classification: Main-belt Asteroid          SPK-ID: 2120972
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1375051444094717 4.3692e-08  
a 2.245364725190437 7.2122e-09 au
q 1.936615524401192 9.8362e-08 au
i 4.306800004617902 4.4655e-06 deg
node 310.3469145500554 5.3473e-05 deg
peri 64.15840511047635 5.5312e-05 deg
M 170.8750377470294 1.3609e-05 deg
tp 2458417.182651559155
(2018-Oct-25.68265156)
4.5965e-05 TDB
period 1228.934595757564
3.36
5.921e-06
1.621e-08
d
yr
n .2929366633853135 1.4114e-09 deg/d
Q 2.554113925979682 8.2039e-09 au
  Orbit Determination Parameters
   # obs. used (total)      742  
   data-arc span      7886 days (21.59 yr)  
   first obs. used      1998-10-19  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:53:26  

Additional Information
 Earth MOID = .94163 au 
 Jupiter MOID = 2.92813 au 
 T_jup = 3.615 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457359.5 (2015-Dec-03.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1371339804918613 4.3846e-08  
q 1.937575271212156 9.8711e-08 au
tp 2457186.028619689810
(2015-Jun-12.52861969)
4.5541e-05 TDB
node 310.4576535354003 5.34e-05 deg
peri 63.61945518177517 5.5246e-05 deg
i 4.309621497638711 4.4692e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      742  
   data-arc span      7886 days (21.59 yr)  
   first obs. used      1998-10-19  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:53:26  

Additional Information
 Jupiter MOID = 2.92813 au 
 T_jup = 3.615 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.922448555808414E-15 -4.319468943665352E-15 -6.325398894905016E-13 1.045496929996066E-14 -2.395953611922975E-13 -2.463753726588266E-15
q -4.319468943665352E-15 9.74379639708752E-15 1.428713540756116E-12 -2.301141695416898E-14 5.401684162178131E-13 5.675166986589399E-15
tp -6.325398894905016E-13 1.428713540756116E-12 2.073978061284614E-9 -8.310153036575348E-12 6.57397717771095E-10 8.968434167580562E-13
node 1.045496929996066E-14 -2.301141695416898E-14 -8.310153036575348E-12 2.851557156714871E-9 -2.845879214361994E-9 8.416679151205886E-11
peri -2.395953611922975E-13 5.401684162178131E-13 6.57397717771095E-10 -2.845879214361994E-9 3.052173095893346E-9 -8.363782480571889E-11
i -2.463753726588266E-15 5.675166986589399E-15 8.968434167580562E-13 8.416679151205886E-11 -8.363782480571889E-11 1.997392930167943E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.3   n/a MPO459569  

120972 (1998 WE4)          Discovered 1998-Nov-20 by Kagawa, T. at Gekko
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 WE4 = 2001 QY4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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