+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 ] [ show orbit diagram ] 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.arc Last 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 ] 2021-Apr-11 03:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin