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21343 (1997 EF)
Classification: Main-belt Asteroid          SPK-ID: 2021343
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1388938519587828 3.2779e-08  
a 2.443324112143939 7.0804e-09 au
q 2.103961414624494 8.0344e-08 au
i 3.903644890377603 2.7701e-06 deg
node 72.37920183107326 5.387e-05 deg
peri 129.1550339939288 5.5006e-05 deg
M 106.4060623203252 1.0736e-05 deg
tp 2458984.180457481030
(2020-May-14.68045748)
4.1784e-05 TDB
period 1394.986639576792
3.82
6.0637e-06
1.66e-08
d
yr
n .2580669877305892 1.1218e-09 deg/d
Q 2.782686809663384 8.0638e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2142  
   data-arc span      10850 days (29.71 yr)  
   first obs. used      1991-10-08  
   last obs. used      2021-06-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49129  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:32:41  

Additional Information
 Earth MOID = 1.10395 au 
 Jupiter MOID = 2.17494 au 
 T_jup = 3.484 
[ 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 14.46   n/a E2021B10  
diameter diameter 3.505 km 0.660 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.329   0.217 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21343 (1997 EF)          Discovered 1997-Mar-01 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 EF = 1999 VK68 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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