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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07609460829152027 3.6996e-08  
a 3.025996364945721 1.7646e-08 au
q 2.795734356863612 1.1258e-07 au
i 11.23877161557223 4.0391e-06 deg
node 108.0022194021045 2.2897e-05 deg
peri 227.9847225153056 3.6824e-05 deg
M 7.126284286854671 2.9925e-05 deg
tp 2458962.440623206154
(2020-Apr-22.94062321)
0.00015974 TDB
period 1922.653530825103
5.26
1.6818e-05
4.605e-08
d
yr
n .1872412237713504 1.6378e-09 deg/d
Q 3.25625837302783 1.8989e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2320  
   data-arc span      24489 days (67.05 yr)  
   first obs. used      1952-10-21  
   last obs. used      2019-11-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44258  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:11:52  

Additional Information
 Earth MOID = 1.79836 au 
 Jupiter MOID = 2.04132 au 
 T_jup = 3.211 
[ 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
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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