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JPL Small-Body Database Browser
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(2004 ER21)
Classification: Aten [NEO]          SPK-ID: 3177197
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1710863806519773 0.00084513  
a .8990406578544207 0.00019514 au
q .7452270456431351 0.00059805 au
i 7.949405621826247 0.035513 deg
node 357.2756803058612 0.027636 deg
peri 343.5069903181789 0.092271 deg
M 195.6022649656381 1.7414 deg
tp 2459142.687282734275
(2020-Oct-20.18728273)
1.4598 TDB
period 311.3633029897892
0.85
0.10138
0.0002776
d
yr
n 1.156205617499522 0.00037645 deg/d
Q 1.052854270065706 0.00022853 au
  Orbit Determination Parameters
   # obs. used (total)      70  
   data-arc span      10 days  
   first obs. used      2004-03-15  
   last obs. used      2004-03-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      7  
   norm. resid. RMS      .50223  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Apr-06 09:13:06  

Additional Information
 Earth MOID = .0403974 au 
 Jupiter MOID = 4.17824 au 
 T_jup = 6.599 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 24.4   n/a MPO62522  

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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