+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13950 (1990 RP9) Classification: Main-belt Asteroid          SPK-ID: 2013950 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1138142082397902 3.5518e-08   a 2.360015939266797 7.2363e-09 au q 2.091412593705862 8.2892e-08 au i 5.609276254463864 3.5285e-06 deg node 247.235982094547 4.3032e-05 deg peri 44.93538906176076 4.7131e-05 deg M 110.4270961319464 1.8601e-05 deg tp 2458594.296199752754 (2019-Apr-20.79619975) 6.8571e-05 TDB period 1324.252590272574 3.63 6.0906e-06 1.668e-08 d yr n .2718514599438318 1.2503e-09 deg/d Q 2.628619284827732 8.0599e-09 au   Orbit Determination Parameters    # obs. used (total)      1937      data-arc span      17791 days (48.71 yr)      first obs. used      1971-05-13      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47139      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 20:48:15   Additional Information  Earth MOID = 1.07959 au   Jupiter MOID = 2.5143 au   T_jup = 3.537  [ 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 13.9   n/a MPO502274   diameter diameter 3.463 km 0.437 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.535   0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   13950 (1990 RP9)          Discovered 1990-Sep-14 by Holt, H. E. at Palomar Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1990 RP9 = 1978 EM7 = 1994 UX  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-26 02:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin