+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18909 (2000 OE21) Classification: Main-belt Asteroid          SPK-ID: 2018909 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1865959235211667 3.7041e-08   a 3.138544111379435 1.6475e-08 au q 2.55290457440467 1.1563e-07 au i 6.101274544509128 3.7668e-06 deg node 182.3194708080894 3.5054e-05 deg peri 234.7281876395586 3.6104e-05 deg M 166.7614957924887 9.4699e-06 deg tp 2458059.728692502715 (2017-Nov-02.22869250) 5.0727e-05 TDB period 2030.910487397281 5.56 1.5992e-05 4.378e-08 d yr n .177260397360673 1.3958e-09 deg/d Q 3.724183648354201 1.955e-08 au   Orbit Determination Parameters    # obs. used (total)      1505      data-arc span      11192 days (30.64 yr)      first obs. used      1989-10-25      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48666      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 18:27:09   Additional Information  Earth MOID = 1.57063 au   Jupiter MOID = 1.67836 au   T_jup = 3.175  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6   n/a MPO263516   diameter diameter 10.005 km 0.398 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.049   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18909 (2000 OE21)          Discovered 2000-Jul-31 by LINEAR at Socorro Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  2000 OE21 = 1989 UY4 = 2000 RN65  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-31 00:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin