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21493 (1998 JA2)
Classification: Main-belt Asteroid          SPK-ID: 2021493
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1307384487049794 3.6611e-08  
a 2.421721709335441 9.6799e-09 au
q 2.105109569861755 9.2082e-08 au
i 3.015169197171768 3.7034e-06 deg
node 42.62126494294401 7.5754e-05 deg
peri 207.9344131068387 7.7913e-05 deg
M 343.5700410925073 2.155e-05 deg
tp 2459263.323012195743
(2021-Feb-17.82301220)
8.2599e-05 TDB
period 1376.527142752241
3.77
8.2532e-06
2.26e-08
d
yr
n .2615277162499045 1.568e-09 deg/d
Q 2.738333848809128 1.0945e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1692  
   data-arc span      15001 days (41.07 yr)  
   first obs. used      1979-04-30  
   last obs. used      2020-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48701  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:56:43  

Additional Information
 Earth MOID = 1.09001 au 
 Jupiter MOID = 2.28871 au 
 T_jup = 3.499 
[ 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 14.51   n/a E2020-QM5  
diameter diameter 7.766 km 0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.051   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21493 (1998 JA2)          Discovered 1998-May-01 by JPL/GEODSS NEAT at Haleakala
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 JA2 = 1979 HA4 = 1986 ET2 = 1990 ED7 = 1999 TX323 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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