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(2021 HH1)
Classification: Apollo [NEO]          SPK-ID: 54138715
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 2459326.5 (2021-Apr-22.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .432815014915342 0.0014397  
a 1.360043026814658 0.0027356 au
q .7713959838783652 0.00040647 au
i 13.99801018141297 0.034479 deg
node 49.40410556914146 0.0063646 deg
peri 248.3904543044609 0.030268 deg
M 321.7440228381678 0.15741 deg
tp 2459388.063626930848
(2021-Jun-22.56362693)
0.067574 TDB
period 579.3318414361951
1.59
1.7479
0.004785
d
yr
n .621405512784418 0.0018748 deg/d
Q 1.948690069750952 0.0039196 au
  Orbit Determination Parameters
   # obs. used (total)      75  
   data-arc span      13 days  
   first obs. used      2021-04-17  
   last obs. used      2021-04-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      8  
   norm. resid. RMS      .40178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-30 06:19:58  

Additional Information
 Earth MOID = .0310808 au 
 Jupiter MOID = 3.33863 au 
 T_jup = 4.720 
[ 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 23.38   .2785 E2021-HE8 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-01 22:53 < 00:01 Earth 0.0416009049121483 0.0412494135586171 0.0419523929612425 15.164088881731 15.1598645914572 2459336.453702151 0.0906954343935972 17517.6135758674 14.4666423258249 -0.008224912327276 262.756632514006 T 8 CATAB v2.0g-lin.ifort 2021-Apr-30 06:19:58 2021-Apr-30 06:20
2024-Oct-19 12:42 6_22:31 Earth 0.180460516195835 0.129753672847376 0.330013230351827 17.577836310477 17.5769963185298 2460603.029465050 9991.35660098645 8877057.57518915 132.032330735792 45.9766881467303 159113.705388526 T 8 CATAB v2.0g-lin.ifort 2021-Apr-30 06:19:58 2021-Apr-30 06:20
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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