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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03443334881054008 3.5049e-08  
a 2.156779096557564 1.2986e-08 au
q 2.082513969618516 7.6238e-08 au
i 2.273476970909996 5.8508e-06 deg
node 214.2346059789651 0.00010759 deg
peri 250.1437206444842 0.00015296 deg
M 272.9506896185746 0.00011227 deg
tp 2457680.249783809354
(2016-Oct-18.74978381)
0.00036199 JED
period 1156.929580832808
3.17
1.0449e-05
2.861e-08
d
yr
n .3111684634607204 2.8104e-09 deg/d
Q 2.231044223496613 1.3434e-08 au
  Orbit Determination Parameters
   # obs. used (total)      830  
   data-arc span      9185 days (25.15 yr)  
   first obs. used      1990-10-16  
   last obs. used      2015-12-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54491  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:47:11  

Additional Information
 Earth MOID = 1.10044 au 
 Jupiter MOID = 2.79418 au 
 T_jup = 3.698 
[ 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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