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(2021 HM)
Classification: Apollo [NEO]          SPK-ID: 54138693
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4406606497613844 3.9299e-05  
a 1.802135616765681 0.0001272 au
q 1.008005364923583 3.2891e-07 au
i 4.920900921557926 0.00032289 deg
node 208.8020131892281 2.2021e-05 deg
peri 356.0132852181492 0.00012944 deg
M 31.20572047843762 0.0033717 deg
tp 2459319.903073238193
(2021-Apr-15.40307324)
0.00016869 TDB
period 883.6486775975593
2.42
0.093558
0.0002561
d
yr
n .4074017300390903 4.3135e-05 deg/d
Q 2.59626586860778 0.00018326 au
  Orbit Determination Parameters
   # obs. used (total)      149  
   data-arc span      7 days  
   first obs. used      2021-04-17  
   last obs. used      2021-04-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      5  
   norm. resid. RMS      .46102  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-25 06:19:16  

Additional Information
 Earth MOID = .0049181 au 
 Jupiter MOID = 2.36304 au 
 T_jup = 3.940 
[ 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 25.50   .56418 E2021-HD3 autocmod 2.9c

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