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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07609460206921172 3.6005e-08  
a 3.025996370341251 1.4519e-08 au
q 2.795734380677254 1.0704e-07 au
i 11.23876732402993 3.249e-06 deg
node 108.0022238248082 2.2674e-05 deg
peri 227.9847238100257 3.4296e-05 deg
M 7.126276792696051 2.5089e-05 deg
tp 2458962.440663128446
(2020-Apr-22.94066313)
0.00013402 TDB
period 1922.65353596741
5.26
1.3837e-05
3.788e-08
d
yr
n .1872412232705572 1.3476e-09 deg/d
Q 3.256258360005247 1.5624e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2779  
   data-arc span      24857 days (68.05 yr)  
   first obs. used      1952-10-21  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41012  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:17:16  

Additional Information
 Earth MOID = 1.79836 au 
 Jupiter MOID = 2.04132 au 
 T_jup = 3.211 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457011.5 (2014-Dec-20.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07964662993882206 3.6143e-08  
q 2.785831873998045 1.0826e-07 au
tp 2457043.584032661596
(2015-Jan-21.08403266)
0.00012963 TDB
node 108.1223437863418 2.2736e-05 deg
peri 228.8617556290384 3.3441e-05 deg
i 11.22400402347014 3.2447e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2779  
   data-arc span      24857 days (68.05 yr)  
   first obs. used      1952-10-21  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41012  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:17:16  

Additional Information
 Jupiter MOID = 2.04132 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.306327112728736E-15 -3.883946974241328E-15 1.235840440234909E-12 1.934213461859084E-16 2.187499068328102E-13 -2.074729680746264E-15
q -3.883946974241328E-15 1.171932646449865E-14 -4.122817978514131E-12 -3.31443203537231E-16 -7.358829274958556E-13 6.765581417901566E-15
tp 1.235840440234909E-12 -4.122817978514131E-12 1.680409665171922E-8 2.987165230942767E-12 3.211555983031812E-9 -6.165548611501031E-12
node 1.934213461859084E-16 -3.31443203537231E-16 2.987165230942767E-12 5.169148041416769E-10 -5.063551890183537E-10 1.386978973390089E-12
peri 2.187499068328102E-13 -7.358829274958556E-13 3.211555983031812E-9 -5.063551890183537E-10 1.118322473040367E-9 -2.531584717700001E-12
i -2.074729680746264E-15 6.765581417901566E-15 -6.165548611501031E-12 1.386978973390089E-12 -2.531584717700001E-12 1.05283247919504E-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

[ show close-approach data ]
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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