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11903 (1991 RD7)
Classification: Main-belt Asteroid          SPK-ID: 2011903
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825644369580028 9.2605e-08  
a 2.563558899366406 2.3573e-08 au
q 2.095544212294901 2.2999e-07 au
i 16.33436653513068 8.8697e-06 deg
node 3.739768592510946 1.9551e-05 deg
peri 354.4863737622273 2.9912e-05 deg
M 334.7203907632494 3.3073e-05 deg
tp 2457505.776450224656
(2016-Apr-27.27645022)
0.00013861 JED
period 1499.213129678416
4.10
2.0679e-05
5.662e-08
d
yr
n .2401259653303735 3.3121e-09 deg/d
Q 3.031573586437911 2.7876e-08 au
  Orbit Determination Parameters
   # obs. used (total)      913  
   data-arc span      21839 days (59.79 yr)  
   first obs. used      1954-09-03  
   last obs. used      2014-06-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49305  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:28:49  

Additional Information
 Earth MOID = 1.09101 au 
 Jupiter MOID = 2.41179 au 
 T_jup = 3.354 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO302139  

11903 (1991 RD7)          Discovered 1991-Sep-02 by McNaught, R. H. at Siding Spring
Reference: 19991026/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 RD7 = 1954 RW = 1987 SL21 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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