+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74855 (1999 TR87) Classification: Main-belt Asteroid          SPK-ID: 2074855 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1333344966932092 4.2265e-08   a 2.319746295268074 1.2068e-08 au q 2.010444090532568 1.02e-07 au i 7.342969286390548 6.0018e-06 deg node 65.2057378336978 4.1941e-05 deg peri 249.191193055059 4.9567e-05 deg M 16.22334438791541 2.8839e-05 deg tp 2458942.343662495656 (2020-Apr-02.84366250) 0.00010319 TDB period 1290.503425246828 3.53 1.007e-05 2.757e-08 d yr n .278960902355718 2.1769e-09 deg/d Q 2.629048500003579 1.3677e-08 au   Orbit Determination Parameters    # obs. used (total)      612      data-arc span      7732 days (21.17 yr)      first obs. used      1998-05-01      last obs. used      2019-07-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .60216      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 17:23:10   Additional Information  Earth MOID = 1.01035 au   Jupiter MOID = 2.62436 au   T_jup = 3.556  [ 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 16.1   n/a MPO474635   74855 (1999 TR87)          Discovered 1999-Oct-15 by Spacewatch at Kitt Peak Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-08 23:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin