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21472 Stimson (1998 HU98)
Classification: Main-belt Asteroid          SPK-ID: 2021472
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06937904201372493 3.6284e-08  
a 2.37324788717217 8.2951e-09 au
q 2.208594222299068 8.6817e-08 au
i 6.274436782152961 3.803e-06 deg
node 45.74004678704877 2.9551e-05 deg
peri 344.6399733890719 3.8917e-05 deg
M 261.5334074876925 2.6948e-05 deg
tp 2459565.757792167758
(2021-Dec-17.25779217)
0.00010074 TDB
period 1335.405255990322
3.66
7.0014e-06
1.917e-08
d
yr
n .2695810866290382 1.4134e-09 deg/d
Q 2.537901552045272 8.8706e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1756  
   data-arc span      14168 days (38.79 yr)  
   first obs. used      1981-09-24  
   last obs. used      2020-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:56:50  

Additional Information
 Earth MOID = 1.21366 au 
 Jupiter MOID = 2.73662 au 
 T_jup = 3.532 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.79   n/a E2020-QM5  
diameter diameter 2.458 km 0.314 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.292   0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21472 Stimson           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
George Stimson mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the San Dieguito High School Academy, Encinitas, California.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 HU98 = 1981 SR8 = 1999 SK19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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