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(2021 HH)
Classification: Apollo [NEO]          SPK-ID: 54138313
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 2459323.5 (2021-Apr-19.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5359112005170353 0.0012237  
a 1.443732041990056 0.0028066 au
q .6700198701422542 0.00046422 au
i 9.143519545811582 0.022112 deg
node 206.0966597618269 0.0020039 deg
peri 100.6208033815162 0.0087103 deg
M 323.4474887544164 0.13617 deg
tp 2459387.834367915708
(2021-Jun-22.33436792)
0.052074 TDB
period 633.6191867652657
1.73
1.8476
0.005058
d
yr
n .568164612940245 0.0016568 deg/d
Q 2.217444213837858 0.0043107 au
  Orbit Determination Parameters
   # obs. used (total)      52  
   data-arc span      13 days  
   first obs. used      2021-04-16  
   last obs. used      2021-04-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      8  
   norm. resid. RMS      .28178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-30 06:19:57  

Additional Information
 Earth MOID = .0180953 au 
 Jupiter MOID = 3.11477 au 
 T_jup = 4.482 
[ 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 25.09   .35418 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
1955-Jul-07 12:51 8_02:16 Earth 0.355732696924273 0.336258396633767 0.375350870683488 14.8886835530074 14.8881804700446 2435296.035662396 11655.5073964814 1037934.18175045 85.8680530271939 20.0842487960506 159527.921437757 T 9 CATAB v2.0g-lin.ifort 2021-Apr-30 06:19:57 2021-Apr-30 06:19
2019-Nov-14 16:18 4_14:16 Earth 0.387612141954329 0.290757164872347 0.484615891764694 28.2876187402837 28.2873757323462 2458802.179368648 6615.84394431522 4848287.65970718 27.4551609429798 4.34242741145895 149596.716022907 T 9 CATAB v2.0g-lin.ifort 2021-Apr-30 06:19:57 2021-Apr-30 06:19
2021-Apr-29 00:15 < 00:01 Earth 0.0367265301566916 0.0364855107839816 0.0369675478408028 16.4886527755999 16.4842522430083 2459333.510528992 0.0623779123660194 12012.200628189 8.11297387302392 -0.0171093735617374 347.674747299759 T 9 CATAB v2.0g-lin.ifort 2021-Apr-30 06:19:57 2021-Apr-30 06:19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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