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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 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1577074415896662 5.9201e-08  
a 2.40938790991375 1.9291e-08 AU
q 2.029409506844179 1.4626e-07 AU
i 3.310832527112301 5.9234e-06 deg
node 101.9565519349562 0.00011038 deg
peri 129.0684928294152 0.00011224 deg
M 174.2845535668264 2.1416e-05 deg
tp 2456339.175039666181
(2013-Feb-15.67503967)
7.861e-05 JED
period 1366.024589372966
3.74
1.6406e-05
4.492e-08
d
yr
n .2635384478439348 3.1651e-09 deg/d
Q 2.78936631298332 2.2334e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1183  
   data-arc span      12937 days (35.42 yr)  
   first obs. used      1979-03-31  
   last obs. used      2014-08-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50751  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:54:55  

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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