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8172 (1991 RP15)
Classification: Main-belt Asteroid          SPK-ID: 2008172
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1498710283258191 4.7496e-08  
a 3.073537557283193 2.2175e-08 AU
q 2.612903322975135 1.4549e-07 AU
i 1.446495560367978 5.398e-06 deg
node 47.54687787182365 0.00024644 deg
peri 16.19370082423024 0.00024733 deg
M 56.47544394318771 2.2338e-05 deg
tp 2456691.745450117217
(2014-Feb-03.24545012)
0.00012199 JED
period 1968.141021956664
5.39
2.1299e-05
5.831e-08
d
yr
n .1829137221285593 1.9795e-09 deg/d
Q 3.534171791591252 2.5498e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1237  
   data-arc span      14418 days (39.47 yr)  
   first obs. used      1975-10-03  
   last obs. used      2015-03-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50029  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:30:44  

Additional Information
 Earth MOID = 1.62585 AU 
 T_jup = 3.212 
[ 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 13.0 mag n/a MPO267740  

8172 (1991 RP15)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991 RP15 = 1975 TK2 = 1975 VA2 = 1982 BE11 = 1986 TE18 = 1986 VO6 = 1988 CY6 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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