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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825596205219765 9.2621e-08  
a 2.563554765060784 2.3749e-08 au
q 2.095553179963983 2.2993e-07 au
i 16.33447449068441 8.8698e-06 deg
node 3.739632605253021 1.955e-05 deg
peri 354.4575226577812 2.9917e-05 deg
M 22.76540895039942 3.3484e-05 deg
tp 2457505.694118229922
(2016-Apr-27.19411823)
0.00013864 JED
period 1499.209502960825
4.10
2.0834e-05
5.704e-08
d
yr
n .240126546215874 3.3369e-09 deg/d
Q 3.031556350157586 2.8085e-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 = 1.09181 au 
 Jupiter MOID = 2.41172 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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