+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   150889 (2001 ST257) Classification: Main-belt Asteroid          SPK-ID: 2150889 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1330410308701498 5.4657e-08   a 2.368124445248192 1.3525e-08 au q 2.053066727823571 1.2956e-07 au i 5.95848335562161 6.506e-06 deg node 162.3719159702544 5.1638e-05 deg peri 165.2539462329244 5.6543e-05 deg M 104.4984375130705 2.5261e-05 deg tp 2458814.121898477164 (2019-Nov-26.62189848) 9.1725e-05 TDB period 1331.083218644518 3.64 1.1403e-05 3.122e-08 d yr n .2704564184699127 2.317e-09 deg/d Q 2.683182162672813 1.5324e-08 au   Orbit Determination Parameters    # obs. used (total)      366      data-arc span      9102 days (24.92 yr)      first obs. used      1996-02-17      last obs. used      2021-01-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .60157      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 19:20:29   Additional Information  Earth MOID = 1.04052 au   Jupiter MOID = 2.64081 au   T_jup = 3.527  [ 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 16.3   n/a MPO506590   150889 (2001 ST257)          Discovered 2001-Sep-20 by LINEAR at Socorro Reference: 20070303/Numbers.arc Last Updated: 2007-03-07 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-15 18:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin