+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   117421 (2005 AA18) Classification: Main-belt Asteroid          SPK-ID: 2117421 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08595257306637936 3.6286e-08   a 2.200970199485551 9.3112e-09 au q 2.011791147597345 7.8132e-08 au i 5.896569212876948 4.8962e-06 deg node 290.3900883611681 3.738e-05 deg peri 269.1612924663752 4.7131e-05 deg M 190.7730044824776 2.9089e-05 deg tp 2459561.143528725246 (2021-Dec-12.64352873) 9.676e-05 TDB period 1192.668283945219 3.27 7.5684e-06 2.072e-08 d yr n .3018441966186595 1.9154e-09 deg/d Q 2.390149251373756 1.0112e-08 au   Orbit Determination Parameters    # obs. used (total)      642      data-arc span      7465 days (20.44 yr)      first obs. used      1999-05-18      last obs. used      2019-10-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61219      source      ORB      producer      Otto Matic      solution date      2019-Nov-07 13:51:01   Additional Information  Earth MOID = 1.01945 au   Jupiter MOID = 2.60125 au   T_jup = 3.653  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.2   n/a MPO436564   117421 (2005 AA18)          Discovered 2005-Jan-06 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-21 20:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin