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120973 (1998 WW4)
Classification: Main-belt Asteroid          SPK-ID: 2120973
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2154534264078644 9.0182e-08  
a 2.278837822205496 1.0561e-08 au
q 1.787854405183486 2.0054e-07 au
i 24.26697618846378 6.6087e-06 deg
node 97.55846497700954 1.049e-05 deg
peri 352.5348463326956 1.7031e-05 deg
M 64.80933122103528 1.1362e-05 deg
tp 2458774.294273881055
(2019-Oct-17.79427388)
3.9135e-05 TDB
period 1256.517539505008
3.44
8.7347e-06
2.391e-08
d
yr
n .2865061478901585 1.9917e-09 deg/d
Q 2.769821239227507 1.2836e-08 au
  Orbit Determination Parameters
   # obs. used (total)      977  
   data-arc span      7831 days (21.44 yr)  
   first obs. used      1998-11-19  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46523  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 20:41:45  

Additional Information
 Earth MOID = .80606 au 
 Jupiter MOID = 2.4454 au 
 T_jup = 3.462 
[ 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 15.0   n/a MPO348206  
diameter diameter 2.345 km 0.242 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.374   0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

120973 (1998 WW4)          Discovered 1998-Nov-19 by CSS at Catalina
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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