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213000 (1981 ET2)
Classification: Main-belt Asteroid          SPK-ID: 2213000
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1838555263135605 4.8436e-08  
a 3.137559701171104 2.7773e-08 au
q 2.560702010972073 1.4772e-07 au
i 8.709723979666327 5.2893e-06 deg
node 249.2088490152925 3.6274e-05 deg
peri 250.4385825560773 4.0612e-05 deg
M 51.22808630982434 1.6356e-05 deg
tp 2458711.636907706792
(2019-Aug-16.13690771)
9.0942e-05 TDB
period 2029.955064037045
5.56
2.6953e-05
7.379e-08
d
yr
n .1773438271505651 2.3547e-09 deg/d
Q 3.714417391370135 3.2879e-08 au
  Orbit Determination Parameters
   # obs. used (total)      241  
   data-arc span      14329 days (39.23 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54901  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 08:52:24  

Additional Information
 Earth MOID = 1.59046 au 
 Jupiter MOID = 1.49656 au 
 T_jup = 3.167 
[ 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 15.7   n/a MPO422828  
diameter diameter 5.043 km 1.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.048   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

213000 (1981 ET2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20090509/Numbers.arcLast Updated: 2009-05-11

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