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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1577074454715523 5.9372e-08  
a 2.409387906533358 1.9679e-08 AU
q 2.02940949464393 1.4694e-07 AU
i 3.310832394475995 6.0072e-06 deg
node 101.9565513171611 0.00011047 deg
peri 129.068496412696 0.00011239 deg
M 174.2845526472553 2.1444e-05 deg
tp 2456339.175044547272
(2013-Feb-15.67504455)
7.8819e-05 JED
period 1366.02458649815
3.74
1.6736e-05
4.582e-08
d
yr
n .2635384483985549 3.2288e-09 deg/d
Q 2.789366318422785 2.2783e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1179  
   data-arc span      12903 days (35.33 yr)  
   first obs. used      1979-03-31  
   last obs. used      2014-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50804  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:14:32  

Additional Information
 Earth MOID = 1.02224 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 13.5 mag n/a MPO259408  
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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