+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   19988 (1990 QW3) Classification: Main-belt Asteroid          SPK-ID: 2019988 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250410 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1532499 n/a   a 2.1423456 n/a AU q 1.8140314 n/a AU i 1.78288 n/a deg node 317.74945 n/a deg peri 341.66894 n/a deg M 110.63592 n/a deg tp 2456048.5131912 (2012-May-01.01319120) n/a JED period 1145.3355399 3.14 n/a n/a d yr n 0.31431837 n/a deg/d Q 2.4706598 n/a AU   Orbit Determination Parameters    # obs. used (total)      846      first obs. used      1987-??-??      last obs. used      2013-01-04      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.696  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.3 mag n/a PDS3 (MPO 7694)   19988 (1990 QW3)          Discovered 1990-Aug-22 by Holt, H. E. at Palomar (675) Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 QW3 = 1987 SA5  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 14:43 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin