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4381 Uenohara (1989 WD1)
Classification: Main-belt Asteroid          SPK-ID: 2004381
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07609460789290491 3.6905e-08  
a 3.025996365845791 1.7209e-08 au
q 2.795734358901401 1.12e-07 au
i 11.23877119076839 3.9826e-06 deg
node 108.0022206171776 2.2803e-05 deg
peri 227.9847224012349 3.6362e-05 deg
M 7.126282917261673 2.9156e-05 deg
tp 2458962.440630503764
(2020-Apr-22.94063050)
0.00015564 TDB
period 1922.653531682931
5.26
1.6401e-05
4.49e-08
d
yr
n .1872412236878092 1.5972e-09 deg/d
Q 3.256258372790182 1.8518e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2420  
   data-arc span      24758 days (67.78 yr)  
   first obs. used      1952-10-21  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43501  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:15:15  

Additional Information
 Earth MOID = 1.79836 au 
 Jupiter MOID = 2.04132 au 
 T_jup = 3.211 
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Orbital Elements at Epoch 2456574.5 (2013-Oct-09.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07980418178266029 3.6944e-08  
q 2.785092894009548 1.1279e-07 au
tp 2457044.323187523305
(2015-Jan-21.82318752)
0.00014632 TDB
node 108.1239868055714 2.2866e-05 deg
peri 229.0367211783374 3.5404e-05 deg
i 11.22414641628849 3.9775e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2420  
   data-arc span      24758 days (67.78 yr)  
   first obs. used      1952-10-21  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43501  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:15:15  

Additional Information
 Jupiter MOID = 2.04132 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.364896058692948E-15 -4.126471738565203E-15 7.233946315830728E-13 -1.149578764786818E-15 1.359366631444095E-13 5.534222638168533E-16
q -4.126471738565203E-15 1.272097284375886E-14 -2.002409851357138E-12 2.512528111232806E-15 -3.902253596869203E-13 -1.032517639877404E-15
tp 7.233946315830728E-13 -2.002409851357138E-12 2.141049440259748E-8 -1.219598658318853E-11 3.982993887231655E-9 1.642173257184522E-12
node -1.149578764786818E-15 2.512528111232806E-15 -1.219598658318853E-11 5.228569039829717E-10 -5.148166245020406E-10 -3.302476417083347E-12
peri 1.359366631444095E-13 -3.902253596869203E-13 3.982993887231655E-9 -5.148166245020406E-10 1.253430539825263E-9 3.521568272762234E-12
i 5.534222638168533E-16 -1.032517639877404E-15 1.642173257184522E-12 -3.302476417083347E-12 3.521568272762234E-12 1.582067454300207E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.3   n/a MPO358672  
diameter diameter 20.242 km 0.821 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.157   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4381 Uenohara (1989 WD1)          Discovered 1989-Nov-22 by Kawasato, N. at Uenohara
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1989 WD1 = 1952 UF = 1954 CD = 1955 HS = 1960 HB = 1976 HN = 1978 TO4 = 1979 YQ8 = 1983 TD1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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