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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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05605619227484154 6.0578e-08  
a 2.196845395656266 1.1723e-08 AU
q 2.073698607759258 1.3236e-07 AU
i 5.426526200862025 6.1087e-06 deg
node 175.7652427191979 5.1849e-05 deg
peri 18.47925736201199 7.0502e-05 deg
M 79.1465228612565 4.5126e-05 deg
tp 2456739.026905176270
(2014-Mar-22.52690518)
0.00014976 JED
period 1189.317113798579
3.26
9.5197e-06
2.606e-08
d
yr
n .3026947109591236 2.4229e-09 deg/d
Q 2.319992183553274 1.238e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1126  
   data-arc span      8906 days (24.38 yr)  
   first obs. used      1991-02-09  
   last obs. used      2015-06-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50074  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:30:47  

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
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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