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21311 Servius (1996 XC9)
Classification: Main-belt Asteroid          SPK-ID: 2021311
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09537201443592713 3.2443e-08  
a 2.226367892552868 6.2222e-09 au
q 2.014034701764631 7.4172e-08 au
i 6.597387955345839 3.2482e-06 deg
node 100.3069768492351 3.7549e-05 deg
peri 337.6881329872191 4.5548e-05 deg
M 69.10672543578575 2.5486e-05 deg
tp 2458967.577396285566
(2020-Apr-28.07739629)
8.555e-05 TDB
period 1213.371590224052
3.32
5.0866e-06
1.393e-08
d
yr
n .2966939418233165 1.2438e-09 deg/d
Q 2.438701083341105 6.8156e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1417  
   data-arc span      9915 days (27.15 yr)  
   first obs. used      1994-01-21  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5357  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:43:10  

Additional Information
 Earth MOID = 1.031 au 
 Jupiter MOID = 2.73868 au 
 T_jup = 3.631 
[ 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 15.2   n/a MPO395207  

21311 Servius           Discovered 1996 Dec. 4 by V. S. Casulli at Colleverde di Guidonia.
Servius Tullius, sixth king of Rome, reigned from 578 to 535 B.C. He constructed the first wall around the city.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020526/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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