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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825732532310922 9.2633e-08  
a 2.562901101251968 2.3537e-08 AU
q 2.094983909486847 2.3002e-07 AU
i 16.33479177021452 8.8724e-06 deg
node 3.746013064802211 1.9589e-05 deg
peri 354.564685602505 2.9939e-05 deg
M 238.5700936860098 3.2294e-05 deg
tp 2457505.997902165439
(2016-Apr-27.49790217)
0.00013852 JED
period 1498.636129299161
4.10
2.0645e-05
5.652e-08
d
yr
n .2402184179079911 3.3092e-09 deg/d
Q 3.030818293017088 2.7834e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      897  
   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      .49582  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:19:32  

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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