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52249 (1981 EK21)
Classification: Main-belt Asteroid          SPK-ID: 2052249
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0841241373614617 3.7289e-08  
a 2.755228899148083 1.4401e-08 au
q 2.523447644773881 1.0361e-07 au
i 7.471746229441112 4.7418e-06 deg
node 346.363192488347 2.8729e-05 deg
peri 260.8169342375011 4.0557e-05 deg
M 186.0479616178172 2.9676e-05 deg
tp 2460007.664356855714
(2023-Mar-04.16435686)
0.00013915 TDB
period 1670.45566795623
4.57
1.3097e-05
3.586e-08
d
yr
n .2155100592645198 1.6897e-09 deg/d
Q 2.987010153522285 1.5613e-08 au
  Orbit Determination Parameters
   # obs. used (total)      897  
   data-arc span      14611 days (40.00 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5436  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:43:48  

Additional Information
 Earth MOID = 1.52235 au 
 Jupiter MOID = 2.07438 au 
 T_jup = 3.326 
[ 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 15.08   n/a MPCxxxxx  
diameter diameter 6.038 km 0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.044   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

52249 (1981 EK21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20030216/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EK21 = 1999 CT34 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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