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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825739068230648 9.1935e-08  
a 2.562764593427084 1.988e-08 AU
q 2.094870649337278 2.3119e-07 AU
i 16.33527613503005 9.7441e-06 deg
node 3.746922640866117 2.1162e-05 deg
peri 354.5974432385115 3.1543e-05 deg
M 190.478726866345 3.2708e-05 deg
tp 2457506.140021154569
(2016-Apr-27.64002115)
0.00014108 JED
period 1498.516398088638
4.10
1.7437e-05
4.774e-08
d
yr
n .2402376113195566 2.7954e-09 deg/d
Q 3.030658537516889 2.351e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      861  
   data-arc span      21768 days (59.60 yr)  
   first obs. used      1954-09-03  
   last obs. used      2014-04-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51707  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 14:01:18  

Additional Information
 Earth MOID = 1.09085 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 12.8 mag n/a MPO253448  

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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