+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   523972 (1999 CW8) Classification: Apollo [NEO]          SPK-ID: 2523972 [ 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 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5994163914658719 5.6326e-08   a 2.235200075281695 7.5656e-09 au q .8953845119520961 1.2349e-07 au i 33.64722939397001 2.4591e-05 deg node 316.9990991416762 1.1245e-05 deg peri 262.1059958427888 2.8474e-05 deg M 111.6553683783269 1.6414e-05 deg tp 2458621.926561283543 (2019-May-18.42656128) 5.3952e-05 TDB period 1220.599062251437 3.34 6.1972e-06 1.697e-08 d yr n .2949371428616106 1.4974e-09 deg/d Q 3.575015638611294 1.2101e-08 au   Orbit Determination Parameters    # obs. used (total)      210      data-arc span      7506 days (20.55 yr)      first obs. used      1999-02-12      last obs. used      2019-09-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48886      source      ORB      producer      Otto Matic      solution date      2019-Sep-02 06:00:04   Additional Information  Earth MOID = .231259 au   Jupiter MOID = 2.68051 au   T_jup = 3.201  [ 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 18.6   n/a MPO160722   SMASSII spectral type spec_B B   n/a Binzel et al. (2004) Icarus 170, 259-294   523972 (1999 CW8)          Discovered 1999-Feb-12 by LINEAR at Socorro Reference: Last Updated: 2019-05-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 21:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin