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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1577074448619132 5.8457e-08  
a 2.409387908155533 1.6867e-08 AU
q 2.029409497479134 1.4308e-07 AU
i 3.310830522679757 5.3848e-06 deg
node 101.9565179407132 0.00010646 deg
peri 129.0685283118038 0.00010801 deg
M 174.2845530510404 2.1242e-05 deg
tp 2456339.175042347227
(2013-Feb-15.67504235)
7.7321e-05 JED
period 1366.02458787771
3.74
1.4344e-05
3.927e-08
d
yr
n .2635384481324051 2.7673e-09 deg/d
Q 2.789366318831932 1.9527e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1371  
   data-arc span      13127 days (35.94 yr)  
   first obs. used      1979-03-31  
   last obs. used      2015-03-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49585  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:34:48  

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 13.6 mag n/a MPO332908  
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
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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