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JPL Small-Body Database Browser
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20400 (1998 OB4)
Classification: Main-belt Asteroid          SPK-ID: 2020400
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09094197022190101 3.9832e-08  
a 2.218467188150407 8.4188e-09 au
q 2.016715411187368 9.0383e-08 au
i 2.509925316378718 5.1302e-06 deg
node 202.7981888596049 8.7683e-05 deg
peri 243.2015982043732 9.2262e-05 deg
M 333.9046478096077 3.0661e-05 deg
tp 2458687.986008655465
(2019-Jul-23.48600866)
0.000103 TDB
period 1206.918492081631
3.30
6.8701e-06
1.881e-08
d
yr
n .2982802918025479 1.6979e-09 deg/d
Q 2.420218965113445 9.1844e-09 au
  Orbit Determination Parameters
   # obs. used (total)      837  
   data-arc span      25165 days (68.90 yr)  
   first obs. used      1949-11-21  
   last obs. used      2018-10-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5464  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-30 17:35:31  

Additional Information
 Earth MOID = 1.03431 au 
 Jupiter MOID = 2.72676 au 
 T_jup = 3.645 
[ 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 16.0   n/a MPO350964  

20400 (1998 OB4)          Discovered 1998-Jul-24 by ODAS at Caussols
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 OB4 = 1994 JD6 = 1997 EN50 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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