+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102948 (1999 XU54) Classification: Main-belt Asteroid          SPK-ID: 2102948 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1762960600563643 4.1487e-08   a 2.181094854939492 6.7367e-09 au q 1.796576425404452 9.0729e-08 au i 1.507409062200605 4.3621e-06 deg node 211.127072083797 0.00013424 deg peri 137.6167197648317 0.0001347 deg M 250.6620650492449 1.0151e-05 deg tp 2459557.837523472840 (2021-Dec-09.33752347) 3.3573e-05 TDB period 1176.549644075146 3.22 5.451e-06 1.492e-08 d yr n .3059794389577045 1.4176e-09 deg/d Q 2.565613284474532 7.9244e-09 au   Orbit Determination Parameters    # obs. used (total)      753      data-arc span      9593 days (26.26 yr)      first obs. used      1994-01-11      last obs. used      2020-04-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52337      source      ORB      producer      Otto Matic      solution date      2020-May-20 18:12:40   Additional Information  Earth MOID = .788727 au   Jupiter MOID = 2.85227 au   T_jup = 3.660  [ 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 16.69   n/a E2021B55   102948 (1999 XU54)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 02:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin