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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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1914-Mar-19 21:08 00:04 Psych 0.0324600650673163 0.032457360417543 0.0324627766203085 3.14039442458631 3.14039430589482 2420211.380351929 3.87573841821961 789.823129250898 38.756028535276 80.572482509305 123425.262677828 T 34 CATAB v2.0f-lin.ifort 2020-Dec-18 02:17:23 2020-Dec-18 02:17

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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