+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20656 (1999 TX258) Classification: Outer Main-belt Asteroid          SPK-ID: 2020656 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1398153582820626 4.3558e-08   a 3.206312830512425 2.0803e-08 au q 2.758021053349956 1.4913e-07 au i 2.027896000659768 4.5599e-06 deg node 41.62358113107483 0.00012463 deg peri 216.3245948237188 0.00012609 deg M 348.9169611752636 2.2373e-05 deg tp 2459265.060014623774 (2021-Feb-19.56001462) 0.0001306 TDB period 2097.042664209133 5.74 2.0408e-05 5.587e-08 d yr n .1716703270487672 1.6707e-09 deg/d Q 3.654604607674894 2.3711e-08 au   Orbit Determination Parameters    # obs. used (total)      1176      data-arc span      9766 days (26.74 yr)      first obs. used      1993-09-15      last obs. used      2020-06-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55244      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:26:09   Additional Information  Earth MOID = 1.74161 au   Jupiter MOID = 1.406 au   T_jup = 3.176  [ 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 14.09   n/a E2021B10   diameter diameter 7.881 km 0.318 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.071   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20656 (1999 TX258)          Discovered 1999-Oct-09 by LINEAR at Socorro Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 TX258 = 1996 BD15 = 1997 EU47  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 15:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin