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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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .10044590470388 3.3071e-08  
a 3.202663902333704 1.7854e-08 au
q 2.880969429201336 1.1024e-07 au
i 2.898965728671884 3.6312e-06 deg
node 212.4122665834485 7.2538e-05 deg
peri 176.1208645403392 7.485e-05 deg
M 293.449758213827 1.9851e-05 deg
tp 2459783.501466735667
(2022-Jul-23.00146674)
0.000117 TDB
period 2093.463889620104
5.73
1.7505e-05
4.793e-08
d
yr
n .1719637973145686 1.4379e-09 deg/d
Q 3.524358375466071 1.9647e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1388  
   data-arc span      10155 days (27.80 yr)  
   first obs. used      1993-09-15  
   last obs. used      2021-07-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54093  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:03:46  

Additional Information
 Earth MOID = 1.88508 au 
 Jupiter MOID = 1.90771 au 
 T_jup = 3.184 
[ show covariance matrix ]

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 13.87   n/a E2021B10  

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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