+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19639 (1999 RO63) Classification: Main-belt Asteroid          SPK-ID: 2019639 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0867020754246757 2.5049e-08   a 2.595040468895399 9.172e-09 au q 2.370045074431144 6.8019e-08 au i 2.848832735290606 1.1527e-06 deg node 201.7764037617891 1.1375e-05 deg peri 213.582350147702 1.4039e-05 deg M 325.7811080120072 1.1526e-05 deg tp 2459345.636976442068 (2021-May-11.13697644) 4.896e-05 TDB period 1526.914183471467 4.18 8.0952e-06 2.216e-08 d yr n .2357696351877048 1.25e-09 deg/d Q 2.820035863359653 9.9672e-09 au   Orbit Determination Parameters    # obs. used (total)      2232      data-arc span      21262 days (58.21 yr)      first obs. used      1962-11-26      last obs. used      2021-02-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49898      source      ORB      producer      Otto Matic      solution date      2021-Mar-17 02:21:03   Additional Information  Earth MOID = 1.38123 au   Jupiter MOID = 2.45144 au   T_jup = 3.410  [ 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 13.90   n/a E2021B10   diameter diameter 8.777 km 0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.100   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19639 (1999 RO63)          Discovered 1999-Sep-07 by LINEAR at Socorro Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 RO63 = 1962 WZ = 1998 KD4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 14:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin