+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21585 Polmear (1998 SX126) Classification: Main-belt Asteroid          SPK-ID: 2021585 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08558243566165823 1.4634e-08   a 2.721551221157471 1.1431e-08 au q 2.488634238872855 3.9036e-08 au i 8.304134937666035 1.2461e-06 deg node 58.2585519165531 4.0028e-06 deg peri 224.8123058353927 1.7883e-05 deg M 60.42306512291742 1.5082e-05 deg tp 2458925.252459514259 (2020-Mar-16.75245951) 6.875e-05 TDB period 1639.922012782567 4.49 1.0332e-05 2.829e-08 d yr n .2195226341215846 1.383e-09 deg/d Q 2.954468203442087 1.2409e-08 au   Orbit Determination Parameters    # obs. used (total)      1948      data-arc span      10516 days (28.79 yr)      first obs. used      1992-04-05      last obs. used      2021-01-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46103      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:49:05   Additional Information  Earth MOID = 1.47845 au   Jupiter MOID = 2.14589 au   T_jup = 3.338  [ 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 13.57   n/a E2021B10   diameter diameter 5.406 km 0.275 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.289   0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21585 Polmear           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Michael McCord Polmear (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his medicine and health team project. He attends the Cherry Creek High School, Greenwood Village, Colorado, 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.arc Last Updated: 2006-07-17 Alternate Designations  1998 SX126 = 1992 GG6 = 1999 XY171  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 12:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin