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9347 (1991 RY21)
Classification: Main-belt Asteroid          SPK-ID: 2009347
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1575157360060817 6.1778e-08  
a 2.410170260394164 2.0425e-08 AU
q 2.030530517928208 1.526e-07 AU
i 3.310776176436708 6.0859e-06 deg
node 101.9578075285339 0.0001169 deg
peri 129.1954570493896 0.00011891 deg
M 16.08285000733586 2.1916e-05 deg
tp 2456339.443694366146
(2013-Feb-15.94369437)		 8.2986e-05 JED
period 1366.68998455881
3.74		 1.7373e-05
4.756e-08		 d
yr
n .2634101398761724 3.3484e-09 deg/d
Q 2.78981000286012 2.3642e-08 AU
   Orbit Determination Parameters
   # obs. used (total)      1177  
   data-arc span      12435 days (34.05 yr)  
   first obs. used      1979-03-31  
   last obs. used      2013-04-16  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .5317  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 13:35:24  

Additional Information
 Earth MOID = 1.02201 AU 
 T_jup = 3.501 
[ 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 13.60 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
diameter diameter 11.23 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
geometric albedo albedo 0.0509   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

9347 (1991 RY21)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar (675)
Reference: 19981005/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 RY21 = 1979 FH4 = 1996 XY30 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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