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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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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 
[ show covariance matrix ]

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

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