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9477 Kefennell (1998 QK41)
Classification: Main-belt Asteroid          SPK-ID: 2009477
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04960139713241034 4.5563e-08  
a 2.29242391644109 1.2276e-08 AU
q 2.17871648736586 1.0216e-07 AU
i 1.787622337266332 4.7512e-06 deg
node 183.9975082065731 0.00016085 deg
peri 22.77394142939773 0.00017316 deg
M 17.88869315971025 6.2188e-05 deg
tp 2456937.503425200745
(2014-Oct-07.00342520)
0.00021908 JED
period 1267.771028618795
3.47
1.0183e-05
2.788e-08
d
yr
n .2839629490446796 2.2809e-09 deg/d
Q 2.40613134551632 1.2885e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      949  
   data-arc span      19994 days (54.74 yr)  
   first obs. used      1960-09-24  
   last obs. used      2015-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .59008  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:02:19  

Additional Information
 Earth MOID = 1.17522 AU 
 T_jup = 3.595 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.1 mag n/a MPO253430  

9477 Kefennell           Discovered 1998 Aug. 17 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Katherine Elizabeth Fennell (b. 1999) is a finalist in the 2012 Broadcom MASTERS, a math and science competition for middle-school students, for her animal and plant sciences project. She attends the Montessori Middle School, Norwalk, Connecticut.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20121029/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1998 QK41 = 1992 YY4 = 4836 P-L 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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