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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2459228.5 (2021-Jan-14.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3085744611531721 0.00036141  
q 1.013337470353312 3.3054e-05 au
tp 2459234.159022385308
(2021-Jan-19.65902239)
0.0025123 TDB
node 271.5141082394803 0.0034519 deg
peri 207.9421013984167 0.0061762 deg
i 1.057954721075809 0.0010599 deg
  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
 Jupiter MOID = 3.1744 au 
 T_jup = 4.563 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.306152015780975E-7 1.193497863008977E-8 7.126971144451127E-7 -1.046894477778374E-6 1.816680204708385E-6 3.809566570482642E-7
q 1.193497863008977E-8 1.09254771201498E-9 6.293376631445612E-8 -9.30758691695892E-8 1.609796350084336E-7 3.496474897551455E-8
tp 7.126971144451127E-7 6.293376631445612E-8 6.311489473091989E-6 -8.568694769012986E-6 1.546423644036629E-5 1.907885234627071E-6
node -1.046894477778374E-6 -9.30758691695892E-8 -8.568694769012986E-6 1.191541573889576E-5 -2.126305365382275E-5 -2.845060980410565E-6
peri 1.816680204708385E-6 1.609796350084336E-7 1.546423644036629E-5 -2.126305365382275E-5 3.814590587314391E-5 4.900230071789647E-6
i 3.809566570482642E-7 3.496474897551455E-8 1.907885234627071E-6 -2.845060980410565E-6 4.900230071789647E-6 1.123485227750165E-6

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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