+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103208 (1999 XN254) Classification: Main-belt Asteroid          SPK-ID: 2103208 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1960956113033858 5.2853e-08   a 2.36936207371978 1.0766e-08 au q 1.904740569474642 1.2505e-07 au i 2.925805488886973 3.9026e-06 deg node 286.9132913679814 0.0001261 deg peri 299.2910210150145 0.00012687 deg M 173.4144136327614 1.5615e-05 deg tp 2458558.805574493519 (2019-Mar-16.30557449) 5.6092e-05 TDB period 1332.126830423344 3.65 9.0794e-06 2.486e-08 d yr n .2702445381162344 1.8419e-09 deg/d Q 2.833983577964918 1.2877e-08 au   Orbit Determination Parameters    # obs. used (total)      533      data-arc span      7696 days (21.07 yr)      first obs. used      1999-12-12      last obs. used      2021-01-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .57361      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:45:38   Additional Information  Earth MOID = .896085 au   Jupiter MOID = 2.16295 au   T_jup = 3.518  [ 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 16.2   n/a MPC19471   103208 (1999 XN254)          Discovered 1999-Dec-12 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1930-Sep-02 05:54 < 00:01 Eunom 0.0331040218001156 0.0330948228258411 0.0331132311904633 7.49617559765347 7.49617554108514 2426221.746006566 0.508168641446451 1040.68187456515 61.360821139443 -64.0435963171593 72573.0749866369 T 20 CATAB v2.0f-lin.ifort 2021-Apr-13 15:45:40 2021-Apr-13 15:45 Alternate Designations  1999 XN254 = 2001 OE109 = 2001 QV35  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 12:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin