+ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .190096977728572 3.2356e-08   a 2.33537035734916 8.5047e-09 au q 1.891423510540189 7.7383e-08 au i 5.846033702456107 4.0568e-06 deg node 20.19974986929285 3.0696e-05 deg peri 39.3917204806671 3.2337e-05 deg M 293.84740856747 1.0813e-05 deg tp 2459440.039110757661 (2021-Aug-13.53911076) 3.9788e-05 TDB period 1303.563140995157 3.57 7.1207e-06 1.95e-08 d yr n .2761661393134907 1.5086e-09 deg/d Q 2.77931720415813 1.0121e-08 au   Orbit Determination Parameters    # obs. used (total)      1314      data-arc span      7681 days (21.03 yr)      first obs. used      1999-08-12      last obs. used      2020-08-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51037      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:56:37   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-Mar-04 23:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin