+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102111 (1999 RQ167) Classification: Main-belt Asteroid          SPK-ID: 2102111 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1900969753954305 3.2271e-08   a 2.335370360453126 8.4912e-09 au q 1.89142351850285 7.7162e-08 au i 5.846033700238094 4.056e-06 deg node 20.19975041527242 3.0477e-05 deg peri 39.3917210717245 3.2119e-05 deg M 293.8474065077274 1.0807e-05 deg tp 2459440.039118693569 (2021-Aug-13.53911869) 3.9769e-05 TDB period 1303.563143594027 3.57 7.1095e-06 1.946e-08 d yr n .2761661387629075 1.5062e-09 deg/d Q 2.779317202403401 1.0105e-08 au   Orbit Determination Parameters    # obs. used (total)      1316      data-arc span      7681 days (21.03 yr)      first obs. used      1999-08-12      last obs. used      2020-08-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51012      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:40:24   Additional Information  Earth MOID = .90694 au   Jupiter MOID = 2.5789 au   T_jup = 3.537  [ 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 15.23   n/a E2021B55   diameter diameter 2.264 km 0.281 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.314   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   102111 (1999 RQ167)          Discovered 1999-Sep-09 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 08:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin