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(2021 AC4)
Classification: Apollo [NEO]          SPK-ID: 54105100
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4371654321483209 0.00029023  
a 1.701933778822859 0.00086185 au
q .9579071629159389 8.9264e-06 au
i 2.857829588869593 0.0018367 deg
node 110.384086040262 0.00031089 deg
peri 333.6047834369181 0.001441 deg
M 269.8151081780993 0.067145 deg
tp 2459203.662571730859
(2020-Dec-20.16257173)
0.0030712 TDB
period 810.9842385523403
2.22
0.61602
0.001687
d
yr
n .4439050512777208 0.00033719 deg/d
Q 2.445960394729779 0.0012386 au
  Orbit Determination Parameters
   # obs. used (total)      44  
   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      .50011  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-28 06:47:27  

Additional Information
 Earth MOID = .00207633 au 
 Jupiter MOID = 2.81005 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 28.9   .32979 E2021D54 autocmod 2.8

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