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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .182573253449611 9.2632e-08  
a 2.562901101383989 2.3535e-08 AU
q 2.094983909034723 2.3002e-07 AU
i 16.33479177832954 8.8723e-06 deg
node 3.74601313789836 1.9581e-05 deg
peri 354.5646853954074 2.9933e-05 deg
M 238.5700937469137 3.2293e-05 deg
tp 2457505.997901950962
(2016-Apr-27.49790195)
0.00013852 JED
period 1498.636129414958
4.10
2.0643e-05
5.652e-08
d
yr
n .2402184178894298 3.3089e-09 deg/d
Q 3.030818293733255 2.7832e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      901  
   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      .49485  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:21:38  

Additional Information
 Earth MOID = 1.09247 AU 
 T_jup = 3.355 
[ 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 (413)
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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