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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 ]

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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 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 
[ 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 26.22   .38325 E2021J33 autocmod 2.9c

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2021-May-03 22:39 < 00:01 Earth 0.034395406592929 0.0340632397863382 0.034727565571533 11.2651766599193 11.2582979575854 2459338.444033804 0.223383681934773 16543.3854480542 11.5888644548207 -0.0599946559028645 207.692708186174 T 5 CATAB v2.0g-lin.ifort 2021-May-03 06:18:47 2021-May-03 06:18
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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