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(2021 AN4)
Classification: Apollo [NEO]          SPK-ID: 54105111
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]

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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3078473479126265 0.00036297  
a 1.464196996935375 0.00081519 au
q 1.013447834607187 3.2808e-05 au
i 1.060758273630848 0.0010534 deg
node 271.5589517236299 0.0035704 deg
peri 207.8175687354076 0.0065145 deg
M 341.312595172706 0.014406 deg
tp 2459234.092644009993
(2021-Jan-19.59264401)
0.0027036 TDB
period 647.139180392471
1.77
0.54044
0.00148
d
yr
n .5562945513230562 0.00046457 deg/d
Q 1.914946159263562 0.0010661 au
  Orbit Determination Parameters
   # obs. used (total)      23  
   data-arc span      8 days  
   first obs. used      2021-01-10  
   last obs. used      2021-01-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .49117  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:22:48  

Additional Information
 Earth MOID = .0306899 au 
 Jupiter MOID = 3.1744 au 
 T_jup = 4.563 
[ 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 27.49   .58013 E2021-BA4 autocmod 2.8

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