+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   9763 (1991 RU17) Classification: Main-belt Asteroid          SPK-ID: 2009763 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02986274380747529 6.4889e-08   a 2.245336080770147 1.3964e-08 AU q 2.178284184628428 1.4466e-07 AU i 3.311178998681812 6.7342e-06 deg node 191.0842982321342 9.4263e-05 deg peri 179.2007565683703 0.00013563 deg M 130.5326068324117 9.789e-05 deg tp 2455954.908425702556 (2012-Jan-28.40842570) 0.00033357 JED period 1228.911079306269 3.36 1.1464e-05 3.139e-08 d yr n .2929422690234211 2.7327e-09 deg/d Q 2.312387976911867 1.4381e-08 AU   Orbit Determination Parameters    # obs. used (total)      1109      data-arc span      9980 days (27.32 yr)      first obs. used      1985-12-18      last obs. used      2013-04-15      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .50747      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:37:06   Additional Information  Earth MOID = 1.17589 AU   T_jup = 3.628  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.7 mag n/a PDS3 (MPC 33202)   9763 (1991 RU17)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675) Reference: 19981208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RU17 = 1985 YT = 1990 FL1 = 1991 PQ17  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 16:57 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin