+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   25486 Michaelwham (1999 XF81) Classification: Main-belt Asteroid          SPK-ID: 2025486 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1595009432787216 4.1199e-08   a 2.539530369070545 1.209e-08 au q 2.134472879718833 1.0485e-07 au i 6.030329308210074 4.1747e-06 deg node 97.32464547668262 3.1216e-05 deg peri 170.745326089164 3.3162e-05 deg M 190.171477826946 1.3237e-05 deg tp 2459697.827307530613 (2022-Apr-28.32730753) 5.6773e-05 TDB period 1478.184155987738 4.05 1.0556e-05 2.89e-08 d yr n .2435420502524899 1.7392e-09 deg/d Q 2.944587858422257 1.4019e-08 au   Orbit Determination Parameters    # obs. used (total)      1035      data-arc span      8623 days (23.61 yr)      first obs. used      1997-04-06      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52741      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 20:48:49   Additional Information  Earth MOID = 1.11866 au   Jupiter MOID = 2.14732 au   T_jup = 3.421  [ 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 14.9   n/a MPO406114   diameter diameter 2.373 km 0.579 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.497   0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   25486 Michaelwham           Discovered 1999 Dec. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Michael Tyler Wham (b. 1990) is a finalist in the 2009 Intel Science Talent Search (STS), a science competition for high school seniors, for his zoology project. He attends the Sterling Ridge Home School, Woodlands, Texas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20090311/MPCPages.arc Last Updated: 2009-03-12 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 13:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin