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305948 (2009 HL18)
Classification: Main-belt Asteroid          SPK-ID: 2305948
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1010698664939469 4.8817e-08  
a 2.808229329421604 2.9811e-08 au
q 2.524401966012577 1.4355e-07 au
i 10.50208136491981 4.2271e-06 deg
node 79.62914831615944 3.0508e-05 deg
peri 90.53665837457027 3.8074e-05 deg
M 162.1352174254938 2.5377e-05 deg
tp 2458226.355307434832
(2018-Apr-17.85530743)
0.00011476 TDB
period 1718.886826370885
4.71
2.737e-05
7.493e-08
d
yr
n .2094378725096603 3.3349e-09 deg/d
Q 3.092056692830631 3.2823e-08 au
  Orbit Determination Parameters
   # obs. used (total)      319  
   data-arc span      6524 days (17.86 yr)  
   first obs. used      2002-12-10  
   last obs. used      2020-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60245  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 19:09:58  

Additional Information
 Earth MOID = 1.55733 au 
 Jupiter MOID = 1.97002 au 
 T_jup = 3.290 
[ 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 15.8   n/a MPO437358  

305948 (2009 HL18)          Discovered 2009-Apr-18 by CSS at Catalina
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ show close-approach data ]
Alternate Designations
 2009 HL18 = 2002 XG115 = 2004 FV105 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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