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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06894329142631102 3.6201e-08  
a 2.373331954515482 8.4948e-09 au
q 2.209706637923945 8.6354e-08 au
i 6.273998458216044 3.7879e-06 deg
node 45.6950580722306 2.9542e-05 deg
peri 344.5344513258099 3.898e-05 deg
M 314.4681515094163 2.7159e-05 deg
tp 2459565.407501587591
(2021-Dec-16.90750159)
0.00010113 TDB
period 1335.476212526444
3.66
7.17e-06
1.963e-08
d
yr
n .2695667632439178 1.4473e-09 deg/d
Q 2.536957271107019 9.0804e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1768  
   data-arc span      14168 days (38.79 yr)  
   first obs. used      1981-09-24  
   last obs. used      2020-07-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48725  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:00  

Additional Information
 Earth MOID = 1.21523 au 
 Jupiter MOID = 2.7351 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 14.80   n/a MPCxxxxx  
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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