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305947 (2009 HH18)
Classification: Main-belt Asteroid          SPK-ID: 2305947
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | 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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04362766256691055 9.1521e-08  
a 3.117978427810269 4.9112e-08 au
q 2.981948317070856 2.8586e-07 au
i 9.975142795502141 1.0072e-05 deg
node 191.3307660662503 4.1154e-05 deg
peri 186.1755423166399 9.1733e-05 deg
M 192.8279783617861 8.4178e-05 deg
tp 2459934.332919852632
(2022-Dec-20.83291985)
0.00047414 TDB
period 2010.981549738585
5.51
4.7513e-05
1.301e-07
d
yr
n .1790170576387425 4.2296e-09 deg/d
Q 3.254008538549682 5.1254e-08 au
  Orbit Determination Parameters
   # obs. used (total)      142  
   data-arc span      7152 days (19.58 yr)  
   first obs. used      2000-09-25  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66302  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 20:02:01  

Additional Information
 Earth MOID = 1.98301 au 
 Jupiter MOID = 1.97331 au 
 T_jup = 3.192 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457372.5 (2015-Dec-16.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0431513814991988 9.1819e-08  
q 2.984515498168997 2.8681e-07 au
tp 2457931.816831236705
(2017-Jun-27.31683124)
0.00046947 TDB
node 191.3519000893718 4.1159e-05 deg
peri 187.8678350651546 9.2034e-05 deg
i 9.973337677288471 1.0071e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      142  
   data-arc span      7152 days (19.58 yr)  
   first obs. used      2000-09-25  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66302  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 20:02:01  

Additional Information
 Jupiter MOID = 1.97331 au 
 T_jup = 3.192 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.430692082658696E-15 -2.597998822702818E-14 5.571398436242278E-12 -4.816857004071081E-16 1.088388328771318E-12 5.964154373113054E-15
q -2.597998822702818E-14 8.22598858597903E-14 -1.531664423996385E-11 7.085483442401597E-15 -3.147495275559223E-12 -1.00392902535803E-14
tp 5.571398436242278E-12 -1.531664423996385E-11 2.203987482591087E-7 -3.234566453444002E-11 3.868208701199611E-8 3.561839688512474E-11
node -4.816857004071081E-16 7.085483442401597E-15 -3.234566453444002E-11 1.694035834833724E-9 -1.67353529869651E-9 1.16771435777673E-10
peri 1.088388328771318E-12 -3.147495275559223E-12 3.868208701199611E-8 -1.67353529869651E-9 8.470293145815459E-9 -1.089697995390737E-10
i 5.964154373113054E-15 -1.00392902535803E-14 3.561839688512474E-11 1.16771435777673E-10 -1.089697995390737E-10 1.014234147053235E-10

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.2   n/a MPO433971  

305947 (2009 HH18)          Discovered 2009-Apr-18 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

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Alternate Designations
 2009 HH18 = 2000 SG337 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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