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16548 (1991 RR9)
Classification: Main-belt Asteroid          SPK-ID: 2016548
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2501575044914017 7.9067e-08  
a 2.342489093457883 1.545e-08 AU
q 1.756497867540133 1.847e-07 AU
i 3.289020810333375 7.3205e-06 deg
node 347.0848045009561 0.00011737 deg
peri 6.331229763698882 0.00011794 deg
M 121.0433723921264 1.6029e-05 deg
tp 2456360.195314087941
(2013-Mar-08.69531409)
5.6411e-05 JED
period 1309.52801294102
3.59
1.2955e-05
3.547e-08
d
yr
n .2749082084861167 2.7197e-09 deg/d
Q 2.928480319375633 1.9314e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      700  
   data-arc span      13707 days (37.53 yr)  
   first obs. used      1976-06-28  
   last obs. used      2014-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58279  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jan-22 04:38:36  

Additional Information
 Earth MOID = .75004 AU 
 T_jup = 3.518 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9 mag n/a MPO250375  

16548 (1991 RR9)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar (675)
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RR9 = 1998 QS7 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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