+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16550 (1991 RB13) Classification: Main-belt Asteroid          SPK-ID: 2016550 [ 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 .233272240212163 1.2031e-07   a 2.784671692861938 3.2624e-08 AU q 2.135085088812637 3.2908e-07 AU i 7.675662287204902 1.0296e-05 deg node 343.9345564142947 4.7991e-05 deg peri 16.11222238322483 5.0319e-05 deg M 232.1010144808214 2.1218e-05 deg tp 2457003.509321925848 (2014-Dec-12.00932193) 0.00010823 JED period 1697.303188231727 4.65 2.9827e-05 8.166e-08 d yr n .2121011746728956 3.7273e-09 deg/d Q 3.434258296911239 4.0234e-08 AU   Orbit Determination Parameters    # obs. used (total)      680      data-arc span      13003 days (35.60 yr)      first obs. used      1977-09-09      last obs. used      2013-04-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .56764      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:03:29   Additional Information  Earth MOID = 1.13221 AU   T_jup = 3.279  [ 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 14.3 mag n/a PDS3 (MPO 2866)   16550 (1991 RB13)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar (675) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RB13 = 1977 RQ2 = 1998 BG37  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 06:07 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin