+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   15284 (1991 RZ16) Classification: Main-belt Asteroid          SPK-ID: 2015284 [ 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 .2053308955302015 6.648e-08   a 2.243848956266484 1.5248e-08 AU q 1.78311744064178 1.4664e-07 AU i 2.528548466989468 7.022e-06 deg node 63.96609838822248 0.0001678 deg peri 355.6163747732054 0.00016895 deg M 109.9260324447162 1.9388e-05 deg tp 2456025.624629308808 (2012-Apr-08.12462931) 6.4585e-05 JED period 1227.690388231745 3.36 1.2514e-05 3.426e-08 d yr n .2932335411687239 2.989e-09 deg/d Q 2.70458047189119 1.8379e-08 AU   Orbit Determination Parameters    # obs. used (total)      705      data-arc span      9892 days (27.08 yr)      first obs. used      1986-03-12      last obs. used      2013-04-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .57686      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:58:49   Additional Information  Earth MOID = .794901 AU   T_jup = 3.603  [ 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 15.1 mag n/a PDS3 (MPO 847)   15284 (1991 RZ16)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar (675) Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RZ16 = 1986 EF3 = 1991 UD5 = 1998 VC31  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 00:41 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin