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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .250789375657858 7.4381e-08  
a 2.341361198021867 1.7689e-08 AU
q 1.754172684980429 1.7386e-07 AU
i 3.290498943978638 6.8501e-06 deg
node 347.0766271180639 0.00011249 deg
peri 6.311430271402628 0.00011305 deg
M 176.0516060426661 1.5568e-05 deg
tp 2456360.561052674543
(2013-Mar-09.06105267)
5.345e-05 JED
period 1308.582331145178
3.58
1.483e-05
4.06e-08
d
yr
n .2751068782083843 3.1177e-09 deg/d
Q 2.928549711063306 2.2125e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      704  
   data-arc span      14032 days (38.42 yr)  
   first obs. used      1976-06-28  
   last obs. used      2014-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56969  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:31:55  

Additional Information
 Earth MOID = .749314 AU 
 T_jup = 3.519 
[ 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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