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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1786548713605954 3.8434e-08  
a 2.743662397723998 1.1547e-08 au
q 2.253493745001715 1.0774e-07 au
i 1.81215685213899 3.3107e-06 deg
node 94.20637242629499 0.00013259 deg
peri 260.5280686295797 0.00013286 deg
M 294.0868406160793 9.8831e-06 deg
tp 2459700.423346037354
(2022-Apr-30.92334604)
4.6334e-05 TDB
period 1659.947810059581
4.54
1.0479e-05
2.869e-08
d
yr
n .2168742883471007 1.3691e-09 deg/d
Q 3.233831050446282 1.361e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1643  
   data-arc span      8887 days (24.33 yr)  
   first obs. used      1997-04-02  
   last obs. used      2021-08-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51704  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:33  

Additional Information
 Earth MOID = 1.24875 au 
 Jupiter MOID = 2.20715 au 
 T_jup = 3.325 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457028.5 (2015-Jan-06.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1756114718341161 3.824e-08  
q 2.265826590505429 1.0687e-07 au
tp 2456377.567705248400
(2013-Mar-26.06770525)
4.3484e-05 TDB
node 94.24918049585263 0.00013236 deg
peri 260.5008596766036 0.00013264 deg
i 1.812458883025097 3.3115e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1643  
   data-arc span      8887 days (24.33 yr)  
   first obs. used      1997-04-02  
   last obs. used      2021-08-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51704  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:33  

Additional Information
 Jupiter MOID = 2.20715 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.462298466267017E-15 -4.070358539229451E-15 3.281407947122159E-14 6.700198979928007E-15 -2.019246414770358E-14 -1.480386244020501E-16
q -4.070358539229451E-15 1.142122568211572E-14 -1.199658608486466E-13 -1.814685193131226E-14 5.611333615541259E-14 4.463397901343298E-16
tp 3.281407947122159E-14 -1.199658608486466E-13 1.890857232092789E-9 -1.232574143771642E-12 4.017610928318691E-10 3.037552376928728E-14
node 6.700198979928007E-15 -1.814685193131226E-14 -1.232574143771642E-12 1.751878811653709E-8 -1.751015216164807E-8 4.201222963748575E-11
peri -2.019246414770358E-14 5.611333615541259E-14 4.017610928318691E-10 -1.751015216164807E-8 1.759392987284156E-8 -4.197947649876377E-11
i -1.480386244020501E-16 4.463397901343298E-16 3.037552376928728E-14 4.201222963748575E-11 -4.197947649876377E-11 1.096597167978123E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.33   n/a MPCxxxxx  
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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