+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103211 (1999 XA258) Classification: Main-belt Asteroid          SPK-ID: 2103211 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .065348974220793 3.9652e-08   a 2.635460119650928 1.3328e-08 au q 2.463235504231931 1.0803e-07 au i 6.504346550356108 3.8842e-06 deg node 109.9419600445071 3.394e-05 deg peri 309.7090053180331 4.3188e-05 deg M 7.437564284722051 2.6291e-05 deg tp 2459168.214216385456 (2020-Nov-14.71421639) 0.00011417 TDB period 1562.726943431092 4.28 1.1855e-05 3.246e-08 d yr n .2303665406891821 1.7475e-09 deg/d Q 2.807684735069925 1.4199e-08 au   Orbit Determination Parameters    # obs. used (total)      759      data-arc span      7709 days (21.11 yr)      first obs. used      1999-12-08      last obs. used      2021-01-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54895      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:42   Additional Information  Earth MOID = 1.48159 au   Jupiter MOID = 2.39596 au   T_jup = 3.386  [ 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 15.4   n/a MPO432558   diameter diameter 5.131 km 0.275 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.046   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103211 (1999 XA258)          Discovered 1999-Dec-08 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1999 XA258 = 2000 AV255  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-09 02:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin