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22311 (1991 EF2)
Classification: Main-belt Asteroid          SPK-ID: 2022311
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0559721888801334 6.0605e-08  
a 2.196565775251756 1.1775e-08 AU
q 2.073619180791728 1.3243e-07 AU
i 5.426633924996812 6.1146e-06 deg
node 175.7696788370344 5.2135e-05 deg
peri 18.3804932304087 7.0917e-05 deg
M 18.6973340797453 4.5565e-05 deg
tp 2456738.742183474319
(2014-Mar-22.24218347)
0.00015067 JED
period 1189.090051791381
3.26
9.5615e-06
2.618e-08
d
yr
n .3027525118536271 2.4344e-09 deg/d
Q 2.319512369711784 1.2434e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1102  
   data-arc span      8542 days (23.39 yr)  
   first obs. used      1991-02-09  
   last obs. used      2014-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50411  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:48:20  

Additional Information
 Earth MOID = 1.07401 AU 
 T_jup = 3.660 
[ 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 14.1 mag n/a MPO257026  

22311 (1991 EF2)          Discovered 1991-Mar-10 by Debehogne, H. at La Silla (809)
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 EF2 = 1998 KN47 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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