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21157 (1993 RC5)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021157
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1004459063774183 3.2514e-08  
a 3.202663903422316 1.7123e-08 au
q 2.880969424820821 1.0924e-07 au
i 2.898967413646489 3.4963e-06 deg
node 212.4122746435607 7.2406e-05 deg
peri 176.1208570385622 7.4677e-05 deg
M 293.4497572878903 1.9427e-05 deg
tp 2459783.501472317471
(2022-Jul-23.00147232)
0.00011437 TDB
period 2093.463890687482
5.73
1.6789e-05
4.597e-08
d
yr
n .1719637972268908 1.3791e-09 deg/d
Q 3.524358382023811 1.8843e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1434  
   data-arc span      10190 days (27.90 yr)  
   first obs. used      1993-09-15  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5347  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:40:58  

Additional Information
 Earth MOID = 1.88508 au 
 Jupiter MOID = 1.90771 au 
 T_jup = 3.184 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456944.5 (2014-Oct-14.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1027310099543623 3.2194e-08  
q 2.866952073022293 1.076e-07 au
tp 2457707.222911086613
(2016-Nov-14.72291109)
0.00010695 TDB
node 212.6301141171345 7.2349e-05 deg
peri 178.0084828242668 7.4571e-05 deg
i 2.90218153169347 3.4996e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1434  
   data-arc span      10190 days (27.90 yr)  
   first obs. used      1993-09-15  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5347  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:40:58  

Additional Information
 Jupiter MOID = 1.90771 au 
 T_jup = 3.184 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.036482587519442E-15 -3.430348906042268E-15 -5.611251028858895E-13 -1.431301037863971E-16 -7.700446122053951E-14 -1.050904528819002E-16
q -3.430348906042268E-15 1.157848334785771E-14 2.253217445677712E-12 8.729014142462397E-16 3.056958802565981E-13 3.518482918636256E-16
tp -5.611251028858895E-13 2.253217445677712E-12 1.143818019408872E-8 -7.09531064318734E-12 1.949055853751988E-9 1.14744472869853E-12
node -1.431301037863971E-16 8.729014142462397E-16 -7.09531064318734E-12 5.234305591432884E-9 -5.228631988455116E-9 -1.146830787868146E-11
peri -7.700446122053951E-14 3.056958802565981E-13 1.949055853751988E-9 -5.228631988455116E-9 5.560828663939901E-9 1.16514956554035E-11
i -1.050904528819002E-16 3.518482918636256E-16 1.14744472869853E-12 -1.146830787868146E-11 1.16514956554035E-11 1.224726691915886E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.88   n/a MPO636382  

21157 (1993 RC5)          Discovered 1993-Sep-15 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1993 RC5 = 1999 VL54 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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