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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03458992113478157 3.8474e-08  
a 2.15663559497551 1.4384e-08 AU
q 2.082037739828844 8.1323e-08 AU
i 2.273350830563019 7.5546e-06 deg
node 214.2476907129297 0.00010804 deg
peri 249.9285563365375 0.00016382 deg
M 148.7010131364848 0.00012388 deg
tp 2456522.668246205353
(2013-Aug-18.16824621)
0.00039723 JED
period 1156.814118059743
3.17
1.1573e-05
3.169e-08
d
yr
n .3111995214959919 3.1134e-09 deg/d
Q 2.231233450122176 1.4881e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      687  
   data-arc span      8981 days (24.59 yr)  
   first obs. used      1990-10-16  
   last obs. used      2015-05-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5575  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:38:54  

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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