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305990 (2009 JR8)
Classification: Main-belt Asteroid          SPK-ID: 2305990
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1322841437019406 3.924e-08  
a 2.395078819617522 1.7994e-08 au
q 2.078247868865764 9.6088e-08 au
i 10.47303443169101 4.7223e-06 deg
node 96.37858119935247 3.8749e-05 deg
peri 11.65769419067745 5.0086e-05 deg
M 103.7837817826699 3.1917e-05 deg
tp 2458610.194084706216
(2019-May-06.69408471)
0.0001186 TDB
period 1353.873669780119
3.71
1.5258e-05
4.177e-08
d
yr
n .2659036866109281 2.9966e-09 deg/d
Q 2.71190977036928 2.0375e-08 au
  Orbit Determination Parameters
   # obs. used (total)      229  
   data-arc span      6003 days (16.44 yr)  
   first obs. used      2003-11-18  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60172  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 20:02:16  

Additional Information
 Earth MOID = 1.0961 au 
 Jupiter MOID = 2.4208 au 
 T_jup = 3.495 
[ 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 17.0   n/a MPO471212  

305990 (2009 JR8)          Discovered 2009-May-13 by Spacewatch at Kitt Peak
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

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