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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1385245908280695 3.2795e-08  
a 2.442030442383381 6.9556e-09 au
q 2.103749174562533 8.0267e-08 au
i 3.905344093278903 2.7757e-06 deg
node 72.41021084920814 5.3859e-05 deg
peri 128.9177443180334 5.5009e-05 deg
M 56.05542618345355 1.0793e-05 deg
tp 2458983.459792848898
(2020-May-13.95979285)
4.1888e-05 TDB
period 1393.87887835666
3.82
5.9552e-06
1.63e-08
d
yr
n .2582720820222406 1.1034e-09 deg/d
Q 2.780311710204228 7.9191e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2127  
   data-arc span      10511 days (28.78 yr)  
   first obs. used      1991-10-08  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48899  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:57:34  

Additional Information
 Earth MOID = 1.1023 au 
 Jupiter MOID = 2.17827 au 
 T_jup = 3.485 
[ 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 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

[ show close-approach data ]
Alternate Designations
 1997 EF = 1999 VK68 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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