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21621 Sherman (1999 KR4)
Classification: Main-belt Asteroid          SPK-ID: 2021621
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2588102227127291 3.3428e-08  
a 2.394982751903573 8.2642e-09 au
q 1.775136732490265 7.9007e-08 au
i 8.712576151028141 3.6994e-06 deg
node 209.3250378557766 2.0765e-05 deg
peri 114.8580605652949 2.2071e-05 deg
M 274.0901322537997 1.0471e-05 deg
tp 2459523.566972355357
(2021-Nov-05.06697236)
4.0484e-05 TDB
period 1353.792213852784
3.71
7.0071e-06
1.918e-08
d
yr
n .2659196856919931 1.3764e-09 deg/d
Q 3.014828771316882 1.0403e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1732  
   data-arc span      11548 days (31.62 yr)  
   first obs. used      1988-10-09  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49509  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:55:54  

Additional Information
 Earth MOID = .783298 au 
 Jupiter MOID = 2.41349 au 
 T_jup = 3.468 
[ 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 14.37   n/a E2021B10  
diameter diameter 8.077 km 0.078 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.057   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21621 Sherman           Discovered 1999 May 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Eric Alan Sherman (b. 1993) was awarded second place in the 2006 Intel International Science and Engineering Fair for his microbiology project. He attends the Ephrata Senior High School, Ephrata, Pennsylvania, 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: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1999 KR4 = 1988 TC4 = 1991 HY4 = 1995 KD2 = 1996 WO3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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