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2908 Shimoyama (1981 WA)
Classification: Main-belt Asteroid          SPK-ID: 2002908
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1550067907202111 4.536e-08  
a 2.975100834622831 1.4937e-08 au
q 2.513940002178924 1.3196e-07 au
i 13.3682994099514 4.8518e-06 deg
node 233.3080759413958 1.3787e-05 deg
peri 153.99300276518 1.745e-05 deg
M 190.6946408861666 1.185e-05 deg
tp 2459881.993605228163
(2022-Oct-29.49360523)
6.5068e-05 TDB
period 1874.351169644755
5.13
1.4116e-05
3.865e-08
d
yr
n .1920664632275022 1.4464e-09 deg/d
Q 3.436261667066737 1.7252e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2449  
   data-arc span      24149 days (66.12 yr)  
   first obs. used      1954-07-02  
   last obs. used      2020-08-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41684  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:04:55  

Additional Information
 Earth MOID = 1.52704 au 
 Jupiter MOID = 2.02094 au 
 T_jup = 3.203 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.9   n/a MPO473805  
diameter diameter 29.663 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.035   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2908 Shimoyama (1981 WA)          Discovered 1981-Nov-18 by Furuta, T. at Tokai
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 WA = 1950 TJ4 = 1955 TQ = 1976 YA4 = 1981 UH10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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