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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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2507893791306897 7.3773e-08  
a 2.341361198924353 1.7533e-08 AU
q 1.754172677525428 1.7265e-07 AU
i 3.290499108504922 6.8409e-06 deg
node 347.07661724159 0.00011036 deg
peri 6.311439223691083 0.00011091 deg
M 176.0516061795321 1.5562e-05 deg
tp 2456360.561051807042
(2013-Mar-09.06105181)
5.3392e-05 JED
period 1308.582331901775
3.58
1.4699e-05
4.024e-08
d
yr
n .2751068780493229 3.0901e-09 deg/d
Q 2.928549720323279 2.193e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      715  
   data-arc span      14088 days (38.57 yr)  
   first obs. used      1976-06-28  
   last obs. used      2015-01-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56814  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:46:30  

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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