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118306 (1998 US39)
Classification: Main-belt Asteroid          SPK-ID: 2118306
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2356140767758301 6.2609e-08  
a 2.320439299365592 7.0549e-09 au
q 1.773711136131214 1.4837e-07 au
i 1.251768004207385 3.308e-06 deg
node 242.6064030844683 0.00023717 deg
peri 92.66629686521526 0.00023741 deg
M 74.92238137245887 7.7897e-06 deg
tp 2458731.803000295749
(2019-Sep-05.30300030)
2.8171e-05 TDB
period 1291.081758502249
3.53
5.8879e-06
1.612e-08
d
yr
n .2788359432927213 1.2716e-09 deg/d
Q 2.86716746259997 8.7171e-09 au
  Orbit Determination Parameters
   # obs. used (total)      588  
   data-arc span      10315 days (28.24 yr)  
   first obs. used      1991-11-07  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5591  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 05:56:38  

Additional Information
 Earth MOID = .764508 au 
 Jupiter MOID = 2.51798 au 
 T_jup = 3.540 
[ 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 16.5   n/a MPO436568  

118306 (1998 US39)          Discovered 1998-Oct-28 by LINEAR at Socorro
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

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