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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1576302387536341 5.6449e-08  
a 2.410157496651003 1.5704e-08 au
q 2.030243795020044 1.3948e-07 au
i 3.310432706554257 5.2844e-06 deg
node 101.9545761414527 9.9882e-05 deg
peri 128.9230853833658 0.0001015 deg
M 279.8518505675696 2.1468e-05 deg
tp 2457704.768897165145
(2016-Nov-12.26889717)
8.3134e-05 JED
period 1366.679128029002
3.74
1.3357e-05
3.657e-08
d
yr
n .2634122323351677 2.5745e-09 deg/d
Q 2.790071198281962 1.8179e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1510  
   data-arc span      13410 days (36.71 yr)  
   first obs. used      1979-03-31  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49321  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:10:17  

Additional Information
 Earth MOID = 1.02075 au 
 Jupiter MOID = 2.1995 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
rotation period rot_per 4.028 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Clark, M. (2015) Minor Planet Bul. 42, 163-166.]
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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