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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1010698630673558 4.8844e-08  
a 2.808229351006332 3.4749e-08 au
q 2.524401995038393 1.4472e-07 au
i 10.50208692345839 5.2746e-06 deg
node 79.62915312529502 3.0645e-05 deg
peri 90.53663555555633 4.1195e-05 deg
M 162.1352288510396 2.7205e-05 deg
tp 2458226.355243956048
(2018-Apr-17.85524396)
0.00012691 TDB
period 1718.886846188553
4.71
3.1905e-05
8.735e-08
d
yr
n .2094378700949754 3.8874e-09 deg/d
Q 3.092056706974271 3.8262e-08 au
  Orbit Determination Parameters
   # obs. used (total)      267  
   data-arc span      6442 days (17.64 yr)  
   first obs. used      2002-12-10  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59895  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 19:51:51  

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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