+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   85537 (1997 WP31) Classification: Main-belt Asteroid          SPK-ID: 2085537 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08171317821160938 4.2186e-08   a 2.634674985005061 1.2826e-08 au q 2.419387318425674 1.0962e-07 au i 13.59402441247467 4.1518e-06 deg node 234.1099166667087 1.7367e-05 deg peri 149.5849727069157 3.03e-05 deg M 123.2435290215854 2.469e-05 deg tp 2458465.750208627442 (2018-Dec-13.25020863) 0.0001064 TDB period 1562.028663268835 4.28 1.1406e-05 3.123e-08 d yr n .2304695224008458 1.6829e-09 deg/d Q 2.849962651584449 1.3874e-08 au   Orbit Determination Parameters    # obs. used (total)      1082      data-arc span      8181 days (22.40 yr)      first obs. used      1997-11-29      last obs. used      2020-04-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51009      source      ORB      producer      Otto Matic      solution date      2020-May-20 15:37:42   Additional Information  Earth MOID = 1.43413 au   Jupiter MOID = 2.56453 au   T_jup = 3.354  [ hide covariance matrix ] Orbital Elements at Epoch 2457407.5 (2016-Jan-20.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08022997742579401 4.2133e-08   q 2.424529046849509 1.092e-07 au tp 2456900.481817927339 (2014-Aug-30.98181793) 0.00010754 TDB node 234.1948634184924 1.7395e-05 deg peri 149.0050254296306 3.0738e-05 deg i 13.57766509078294 4.1483e-06 deg   Orbit Determination Parameters    # obs. used (total)      1082      data-arc span      8181 days (22.40 yr)      first obs. used      1997-11-29      last obs. used      2020-04-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51009      source      ORB      producer      Otto Matic      solution date      2020-May-20 15:37:42   Additional Information  Jupiter MOID = 2.56453 au   T_jup = 3.354  Orbit Covariance (6×6)   e q tp node peri i e 1.775171189337153E-15 -4.57492703874393E-15 -7.027019418492824E-13 -6.204954626630601E-15 -2.015869726228532E-13 1.39697855464547E-15 q -4.57492703874393E-15 1.19252511302455E-14 1.943650913054831E-12 1.787150334824284E-14 5.575741815472302E-13 -3.803277277799637E-15 tp -7.027019418492824E-13 1.943650913054831E-12 1.156530652648497E-8 2.294158331955303E-11 2.741161340887758E-9 -8.847403204360845E-12 node -6.204954626630601E-15 1.787150334824284E-14 2.294158331955303E-11 3.025990585668655E-10 -2.882132422301692E-10 -7.340934247829548E-12 peri -2.015869726228532E-13 5.575741815472302E-13 2.741161340887758E-9 -2.882132422301692E-10 9.44835795858649E-10 4.978631094380605E-12 i 1.39697855464547E-15 -3.803277277799637E-15 -8.847403204360845E-12 -7.340934247829548E-12 4.978631094380605E-12 1.72082673074428E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.7   n/a MPO459396   85537 (1997 WP31)          Discovered 1997-Nov-29 by LINEAR at Socorro Reference: 20040830/Numbers.arc Last Updated: 2004-09-06 Alternate Designations  1997 WP31 = 2001 UA23  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 03:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin