+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103188 (1999 XT242) Classification: Main-belt Asteroid          SPK-ID: 2103188 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1682556662474742 5.144e-08   a 2.757736086521579 1.5966e-08 au q 2.293731363949189 1.3968e-07 au i 13.92787919187916 6.5185e-06 deg node 19.3305210798773 1.6955e-05 deg peri 40.78927865712669 2.3351e-05 deg M 244.9544717088045 1.6305e-05 deg tp 2459735.057862898621 (2022-Jun-04.55786290) 7.7768e-05 TDB period 1672.736294073162 4.58 1.4526e-05 3.977e-08 d yr n .2152162306010527 1.869e-09 deg/d Q 3.22174080909397 1.8652e-08 au   Orbit Determination Parameters    # obs. used (total)      1015      data-arc span      7508 days (20.56 yr)      first obs. used      1999-11-01      last obs. used      2020-05-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51104      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:50:14   Additional Information  Earth MOID = 1.32172 au   Jupiter MOID = 2.26933 au   T_jup = 3.280  [ 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 14.35   n/a E2021B55   diameter diameter 3.481 km 0.655 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.231   0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103188 (1999 XT242)          Discovered 1999-Dec-13 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XT242 = 2001 FQ162  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 02:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin