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JPL Small-Body Database Browser
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11903 (1991 RD7)
Classification: Main-belt Asteroid          SPK-ID: 2011903
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1815278445965637 6.7675e-08  
a 2.565047279821666 1.538e-08 au
q 2.09941977582736 1.7037e-07 au
i 16.32058995847023 6.1007e-06 deg
node 3.710183751327023 1.4923e-05 deg
peri 354.2527973567499 2.2098e-05 deg
M 263.1489812816376 2.2599e-05 deg
tp 2459004.185528722118
(2020-Jun-03.68552872)
9.5827e-05 TDB
period 1500.518964726279
4.11
1.3495e-05
3.695e-08
d
yr
n .2399169943617942 2.1578e-09 deg/d
Q 3.030674783815972 1.8172e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1462  
   data-arc span      23729 days (64.97 yr)  
   first obs. used      1954-09-03  
   last obs. used      2019-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46093  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:33:56  

Additional Information
 Earth MOID = 1.09588 au 
 Jupiter MOID = 2.4177 au 
 T_jup = 3.354 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9   n/a MPO302139  
diameter diameter 6.774 km 0.359 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.222   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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