+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   47391 (1999 XL108) Classification: Main-belt Asteroid          SPK-ID: 2047391 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08644219757332178 2.9364e-08   a 2.333654776032473 7.6641e-09 au q 2.131928528814748 6.9167e-08 au i 3.834318028804195 3.9021e-06 deg node 192.8900189505116 4.3284e-05 deg peri 299.4794402735063 4.9325e-05 deg M 201.0756081121273 2.5122e-05 deg tp 2459575.332612706062 (2021-Dec-26.83261271) 9.2155e-05 TDB period 1302.126993320109 3.57 6.4146e-06 1.756e-08 d yr n .276470729695947 1.362e-09 deg/d Q 2.535381023250198 8.3266e-09 au   Orbit Determination Parameters    # obs. used (total)      1284      data-arc span      9189 days (25.16 yr)      first obs. used      1995-09-17      last obs. used      2020-11-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51311      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:48:46   Additional Information  Earth MOID = 1.14913 au   Jupiter MOID = 2.48884 au   T_jup = 3.561  [ 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 15.5   n/a MPO337637   47391 (1999 XL108)          Discovered 1999-Dec-04 by CSS at Catalina Reference: 20020921/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-22 03:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin