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21508 Benbrewer (1998 KU33)
Classification: Main-belt Asteroid          SPK-ID: 2021508
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1785430026019617 3.9237e-08  
a 2.743206485362896 1.1731e-08 au
q 2.253426162709031 1.096e-07 au
i 1.812206947865464 3.3143e-06 deg
node 94.20562585960188 0.00013515 deg
peri 260.5797856885124 0.00013542 deg
M 251.5072590095161 9.8124e-06 deg
tp 2459700.631669374970
(2022-May-01.13166938)
4.6488e-05 TDB
period 1659.534078789487
4.54
1.0646e-05
2.915e-08
d
yr
n .2169283563387831 1.3916e-09 deg/d
Q 3.232986808016762 1.3826e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1582  
   data-arc span      8458 days (23.16 yr)  
   first obs. used      1997-04-02  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52134  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:51:34  

Additional Information
 Earth MOID = 1.24783 au 
 Jupiter MOID = 2.20784 au 
 T_jup = 3.325 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.32   n/a E2020-QM5  
diameter diameter 3.841 km 0.695 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.208   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21508 Benbrewer           Discovered 1998 May 22 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Benjamin Wayne Brewer (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his microbiology project. He attends the Eastern High School, Pekin, Indiana, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

Alternate Designations
 1998 KU33 = 1999 XQ18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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