+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   21079 (1991 RR17) Classification: Main-belt Asteroid          SPK-ID: 2021079 [ 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 .1597810466803534 8.6142e-08   a 2.760084964572708 3.9863e-08 AU q 2.319075700006575 2.458e-07 AU i 9.351811238228908 9.2637e-06 deg node 8.07725178653336 4.3172e-05 deg peri 324.4009763659918 5.0279e-05 deg M 270.5778927957073 3.3151e-05 deg tp 2456816.529860047518 (2014-Jun-08.02986005) 0.00015919 JED period 1674.873857254808 4.59 3.6284e-05 9.934e-08 d yr n .2149415601901243 4.6565e-09 deg/d Q 3.201094229138841 4.6232e-08 AU   Orbit Determination Parameters    # obs. used (total)      748      data-arc span      7888 days (21.60 yr)      first obs. used      1991-09-11      last obs. used      2013-04-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .54204      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:28:32   Additional Information  Earth MOID = 1.31656 AU   T_jup = 3.304  [ 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 13.5 mag n/a PDS3 (MPO 8635)   21079 (1991 RR17)          Discovered 1991-Sep-11 by Holt, H. E. at Palomar (675) Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RR17 = 1999 GZ52 = 2000 PU19  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 13:16 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin