+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   277499 (2005 WU121) Classification: Main-belt Asteroid          SPK-ID: 2277499 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1721226600576995 7.2677e-08   a 2.566920349550373 2.4033e-08 au q 2.125095190829523 1.9355e-07 au i 8.619013300485392 1.1149e-05 deg node 241.6731035063039 6.0013e-05 deg peri 209.1016473624458 8.1042e-05 deg M 175.9483388187734 5.5326e-05 deg tp 2458266.324840333138 (2018-May-27.82484033) 0.0002247 TDB period 1502.162846517706 4.11 2.1096e-05 5.776e-08 d yr n .2396544428152695 3.3657e-09 deg/d Q 3.008745508271223 2.817e-08 au   Orbit Determination Parameters    # obs. used (total)      212      data-arc span      6791 days (18.59 yr)      first obs. used      2000-09-03      last obs. used      2019-04-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61936      source      ORB      producer      Otto Matic      solution date      2019-Jul-14 05:58:47   Additional Information  Earth MOID = 1.14588 au   Jupiter MOID = 2.23282 au   T_jup = 3.395  [ hide covariance matrix ] Orbital Elements at Epoch 2456782.5 (2014-May-05.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1737097265383023 7.2515e-08   q 2.119545741455003 1.9225e-07 au tp 2456767.451580952028 (2014-Apr-19.95158095) 0.00021102 TDB node 241.7333968623428 5.996e-05 deg peri 209.1820292342099 8.0576e-05 deg i 8.626234973448472 1.1159e-05 deg   Orbit Determination Parameters    # obs. used (total)      212      data-arc span      6791 days (18.59 yr)      first obs. used      2000-09-03      last obs. used      2019-04-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61936      source      ORB      producer      Otto Matic      solution date      2019-Jul-14 05:58:47   Additional Information  Jupiter MOID = 2.23282 au   T_jup = 3.395  Orbit Covariance (6×6)   e q tp node peri i e 5.258495805439585E-15 -1.387456023039327E-14 -1.156146231337079E-11 -1.335265272857945E-13 -2.953738631571767E-12 2.621473124643125E-14 q -1.387456023039327E-14 3.695945286656698E-14 3.154000053682677E-11 3.64346504836815E-13 8.04999144106306E-12 -7.107810296148104E-14 tp -1.156146231337079E-11 3.154000053682677E-11 4.452819523120642E-8 4.670372690271979E-10 1.147234263908366E-8 -9.230308454852673E-11 node -1.335265272857945E-13 3.64346504836815E-13 4.670372690271979E-10 3.595170610895994E-9 -3.430413057267156E-9 -4.849610375119182E-10 peri -2.953738631571767E-12 8.04999144106306E-12 1.147234263908366E-8 -3.430413057267156E-9 6.492416612210686E-9 4.551918372768609E-10 i 2.621473124643125E-14 -7.107810296148104E-14 -9.230308454852673E-11 -4.849610375119182E-10 4.551918372768609E-10 1.245160888065285E-10 [ 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 16.9   n/a MPO470935   277499 (2005 WU121)          Discovered 2005-Nov-30 by Mt. Lemmon Survey at Mount Lemmon Reference: 20110517/Numbers.arc Last Updated: 2011-05-20 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 21:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin