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85803 (1998 WS4)
Classification: Main-belt Asteroid          SPK-ID: 2085803
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3166153689041347 3.9151e-08  
a 2.607437912465528 1.1832e-08 au
q 1.781882995915628 1.0577e-07 au
i 25.6745388155491 5.4408e-06 deg
node 212.3303136444257 9.5347e-06 deg
peri 260.5558981858584 1.6297e-05 deg
M 20.49383867335108 7.9681e-06 deg
tp 2458912.953214775223
(2020-Mar-04.45321478)
3.4131e-05 TDB
period 1537.869170498657
4.21
1.0468e-05
2.866e-08
d
yr
n .2340901338722261 1.5933e-09 deg/d
Q 3.432992829015428 1.5578e-08 au
  Orbit Determination Parameters
   # obs. used (total)      863  
   data-arc span      15368 days (42.08 yr)  
   first obs. used      1978-01-06  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46258  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:38:56  

Additional Information
 Earth MOID = .970017 au 
 Jupiter MOID = 2.44195 au 
 T_jup = 3.206 
[ 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 15.1   n/a MPO502667  
diameter diameter 5.183 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.072   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85803 (1998 WS4)          Discovered 1998-Nov-18 by CSS at Catalina
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1998 WS4 = 1981 US21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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