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21158 (1993 RP18)
Classification: Main-belt Asteroid          SPK-ID: 2021158
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .034589919598524 3.7945e-08  
a 2.156635594371493 1.4165e-08 AU
q 2.082037742558868 8.0535e-08 AU
i 2.273350346478308 7.2898e-06 deg
node 214.2476916386146 0.00010793 deg
peri 249.928562519487 0.00016163 deg
M 148.7010064182769 0.00012143 deg
tp 2456522.668267994200
(2013-Aug-18.16826799)
0.00038916 JED
period 1156.814117573754
3.17
1.1397e-05
3.12e-08
d
yr
n .3111995216267299 3.0659e-09 deg/d
Q 2.231233446184119 1.4655e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      698  
   data-arc span      9020 days (24.70 yr)  
   first obs. used      1990-10-16  
   last obs. used      2015-06-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55552  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:28:32  

Additional Information
 Earth MOID = 1.10005 AU 
 T_jup = 3.699 
[ 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 15.8 mag n/a MPO244372  

21158 (1993 RP18)          Discovered 1993-Sep-15 by Debehogne, H., Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1993 RP18 = 1998 EN15 = 2000 WZ144 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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