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18308 (1981 EZ11)
Classification: Main-belt Asteroid          SPK-ID: 2018308
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05670982173073226 3.8852e-08  
a 2.302306541387531 8.3708e-09 au
q 2.171743147855946 9.0133e-08 au
i 3.742823540431067 4.0053e-06 deg
node 328.428680091456 5.1572e-05 deg
peri 236.3933183429566 6.0042e-05 deg
M 114.0476082696352 3.151e-05 deg
tp 2458796.271593848926
(2019-Nov-08.77159385)
0.00011165 TDB
period 1275.977886974519
3.49
6.9588e-06
1.905e-08
d
yr
n .2821365508563779 1.5387e-09 deg/d
Q 2.432869934919117 8.8455e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1489  
   data-arc span      14370 days (39.34 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51826  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:19  

Additional Information
 Earth MOID = 1.16948 au 
 Jupiter MOID = 2.53474 au 
 T_jup = 3.585 
[ 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 15.3   n/a MPO381410  

18308 (1981 EZ11)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EZ11 = 1993 UO1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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