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20244 (1998 EF)
Classification: Main-belt Asteroid          SPK-ID: 2020244
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05005149867355092 4.2967e-08  
a 2.37906290025098 1.1017e-08 au
q 2.259987236654774 1.0551e-07 au
i 10.09563756781819 4.1033e-06 deg
node 125.3262152266643 2.3283e-05 deg
peri 83.96578136702232 4.9505e-05 deg
M 242.1935152601349 4.5965e-05 deg
tp 2459039.105436116892
(2020-Jul-08.60543612)
0.00017233 TDB
period 1340.316344645579
3.67
9.31e-06
2.549e-08
d
yr
n .2685933074219096 1.8657e-09 deg/d
Q 2.498138563847186 1.1568e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1240  
   data-arc span      10440 days (28.58 yr)  
   first obs. used      1991-05-08  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53561  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:42:37  

Additional Information
 Earth MOID = 1.28201 au 
 Jupiter MOID = 2.51157 au 
 T_jup = 3.517 
[ 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 14.6   n/a MPO502319  
diameter diameter 3.210 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.327   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20244 (1998 EF)          Discovered 1998-Mar-01 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 EF = 1991 JD2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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