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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05605619262717842 6.0599e-08  
a 2.196845395828932 1.1776e-08 AU
q 2.073698607148215 1.3244e-07 AU
i 5.426526011272853 6.114e-06 deg
node 175.7652374068138 5.2093e-05 deg
peri 18.47926655278371 7.0828e-05 deg
M 79.14651877550155 4.5313e-05 deg
tp 2456739.026918643383
(2014-Mar-22.52691864)
0.00015039 JED
period 1189.317113938794
3.26
9.5627e-06
2.618e-08
d
yr
n .3026947109234372 2.4338e-09 deg/d
Q 2.319992184509648 1.2436e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1113  
   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      .50191  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:46:04  

Additional Information
 Earth MOID = 1.07498 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 14.2 mag n/a MPO299122  

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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