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(2009 HD21)
Classification: Apollo [NEO, PHA]          SPK-ID: 3457843
[ 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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6881621506423056 2.6964e-08  
a 2.771934973931498 7.3977e-08 au
q .8643942408301752 8.3776e-08 au
i 18.64197251964715 2.4374e-05 deg
node 179.2359074710641 2.2179e-05 deg
peri 134.2529869130026 2.3616e-05 deg
M 164.3062660817182 3.6125e-05 deg
tp 2458431.148846154196
(2018-Nov-08.64884615)		 0.00013837 TDB
period 1685.671654462279
4.62		 6.7481e-05
1.848e-07		 d
yr
n .2135647230271771 8.5494e-09 deg/d
Q 4.679475707032822 1.2489e-07 au
   Orbit Determination Parameters
   # obs. used (total)      146  
   data-arc span      3281 days (8.98 yr)  
   first obs. used      2009-03-24  
   last obs. used      2018-03-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46975  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Mar-19 06:25:31  

Additional Information
 Earth MOID = .0126196 au 
 Jupiter MOID = 1.30922 au 
 T_jup = 2.881 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456259.5 (2012-Nov-28.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6896180367211739 2.6326e-08  
q .8585023650517409 8.139e-08 au
tp 2456748.920935856469
(2014-Apr-01.42093586)		 7.1375e-05 TDB
node 179.3477707981362 2.2216e-05 deg
peri 134.1967343856297 2.3607e-05 deg
i 18.64266302378065 2.438e-05 deg
   Orbit Determination Parameters
   # obs. used (total)      146  
   data-arc span      3281 days (8.98 yr)  
   first obs. used      2009-03-24  
   last obs. used      2018-03-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46975  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Mar-19 06:25:31  

Additional Information
 Jupiter MOID = 1.30922 au 
 T_jup = 2.881 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.930684731401738E-16 -2.061800279661594E-15 -4.83844324847998E-13 2.059813983404346E-13 -3.576016944953021E-13 1.005984997557497E-13
q -2.061800279661594E-15 6.624382074355357E-15 2.959649131647991E-12 -5.758768675941097E-13 1.165648429031473E-12 -3.150620542706604E-13
tp -4.83844324847998E-13 2.959649131647991E-12 5.094421272214467E-9 -3.108031441149069E-11 6.137908066413994E-10 -1.448862291773069E-10
node 2.059813983404346E-13 -5.758768675941097E-13 -3.108031441149069E-11 4.93570686552306E-10 -4.514511353191286E-10 3.521636309952596E-10
peri -3.576016944953021E-13 1.165648429031473E-12 6.137908066413994E-10 -4.514511353191286E-10 5.572931912067858E-10 -3.637131199817531E-10
i 1.005984997557497E-13 -3.150620542706604E-13 -1.448862291773069E-10 3.521636309952596E-10 -3.637131199817531E-10 5.943941943665682E-10

[ 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 18.2   n/a MPO166339  

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