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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 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2501575102113373 7.4362e-08  
a 2.342489100785033 1.7757e-08 AU
q 1.756497859635455 1.7386e-07 AU
i 3.289013833175599 6.8465e-06 deg
node 347.0846946636827 0.00011282 deg
peri 6.331321695798797 0.00011338 deg
M 121.0433815532662 1.5314e-05 deg
tp 2456360.195278697717
(2013-Mar-08.69527870)
5.3664e-05 JED
period 1309.528019085194
3.59
1.489e-05
4.077e-08
d
yr
n .2749082071962749 3.1259e-09 deg/d
Q 2.928480341934612 2.2199e-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      .57006  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 21:35:58  

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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