+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102490 (1999 TD264) Classification: Outer Main-belt Asteroid          SPK-ID: 2102490 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07060613270590922 6.2222e-08   a 3.240378807392558 2.4092e-08 au q 3.011588191300384 2.0773e-07 au i 1.67184396442969 6.3034e-06 deg node 42.28330661995796 0.00015142 deg peri 207.0280291258596 0.00015722 deg M 327.5620527497371 4.2932e-05 deg tp 2459192.474243142932 (2020-Dec-08.97424314) 0.00025376 TDB period 2130.551819394041 5.83 2.3761e-05 6.505e-08 d yr n .1689703093456742 1.8844e-09 deg/d Q 3.469169423484733 2.5793e-08 au   Orbit Determination Parameters    # obs. used (total)      587      data-arc span      8857 days (24.25 yr)      first obs. used      1996-03-12      last obs. used      2020-06-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55904      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:54:28   Additional Information  Earth MOID = 1.99769 au   Jupiter MOID = 1.54563 au   T_jup = 3.179  [ 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 14.92   n/a E2021B55   diameter diameter 5.246 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.070   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   102490 (1999 TD264)          Discovered 1999-Oct-15 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 TD264 = 1996 EG11  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 20:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin