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(2021 AC4)
Classification: Apollo [NEO]          SPK-ID: 54105100
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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4371518790867395 0.00029161  
a 1.701893483484009 0.00086589 au
q .9579075491734979 8.9665e-06 au
i 2.857741830408039 0.0018459 deg
node 110.3841005461422 0.00031239 deg
peri 333.6047051036597 0.0014486 deg
M 269.8119731282846 0.067463 deg
tp 2459203.662418776963
(2020-Dec-20.16241878)
0.0030865 TDB
period 810.9554371750436
2.22
0.61889
0.001694
d
yr
n .4439208167270657 0.00033879 deg/d
Q 2.445879417794521 0.0012444 au
  Orbit Determination Parameters
   # obs. used (total)      41  
   data-arc span      2 days  
   first obs. used      2021-01-10  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      7  
   norm. resid. RMS      .51029  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-12 05:24:26  

Additional Information
 Earth MOID = .00207627 au 
 Jupiter MOID = 2.81013 au 
 T_jup = 4.085 
[ 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 28.838   .33314 3 autocmod 2.8

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