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JPL Small-Body Database Browser
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(2021 HT1)
Classification: Apollo [NEO]          SPK-ID: 54139084
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 2459324.5 (2021-Apr-20.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5059936191948374 0.0019181  
a 1.86006568274014 0.0067549 au
q .9188843159903402 0.0002309 au
i 4.27506596768507 0.0134 deg
node 201.5832653692154 0.0017782 deg
peri 68.0160683571045 0.0038087 deg
M 340.7821907692505 0.11502 deg
tp 2459373.964340667253
(2021-Jun-08.46434067)
0.02661 TDB
period 926.5969094811663
2.54
5.0475
0.01382
d
yr
n .3885184553459999 0.0021164 deg/d
Q 2.801247049489939 0.010173 au
  Orbit Determination Parameters
   # obs. used (total)      30  
   data-arc span      14 days  
   first obs. used      2021-04-18  
   last obs. used      2021-05-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      8  
   norm. resid. RMS      .49034  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 06:18:47  

Additional Information
 Earth MOID = .0311925 au 
 Jupiter MOID = 2.33281 au 
 T_jup = 3.826 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 3.679243412338061E-6 -4.42885035988777E-7 -5.104171371383182E-5 3.406619924434449E-6 7.291704556850565E-6 2.570224941422512E-5
q -4.42885035988777E-7 5.331258749554743E-8 6.144007858358342E-6 -4.100077125188094E-7 -8.77931330746611E-7 -3.093848042012644E-6
tp -5.104171371383182E-5 6.144007858358342E-6 .0007081052370736777 -4.726608711513041E-5 -.0001011349612656693 -.000356567756054197
node 3.406619924434449E-6 -4.100077125188094E-7 -4.726608711513041E-5 3.162130402300128E-6 6.732708087823902E-6 2.38015992832251E-5
peri 7.291704556850565E-6 -8.77931330746611E-7 -.0001011349612656693 6.732708087823902E-6 1.450606695321368E-5 5.09283349610434E-5
i 2.570224941422512E-5 -3.093848042012644E-6 -.000356567756054197 2.38015992832251E-5 5.09283349610434E-5 .0001795513418657139

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 26.22   .38325 E2021J33 autocmod 2.9c

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