+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   227464 (2005 WK120) Classification: Main-belt Asteroid          SPK-ID: 2227464 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1598143111541649 5.7983e-08   a 2.61913820602286 2.4175e-08 au q 2.200562437809761 1.634e-07 au i 1.087386536110917 6.2571e-06 deg node 174.5901745347433 0.00028119 deg peri 202.0940216384138 0.00028197 deg M 232.8510332205939 2.586e-05 deg tp 2459747.322511440642 (2022-Jun-16.82251144) 0.00011667 TDB period 1548.232039196683 4.24 2.1436e-05 5.869e-08 d yr n .2325232851961842 3.2194e-09 deg/d Q 3.037713974235958 2.8039e-08 au   Orbit Determination Parameters    # obs. used (total)      338      data-arc span      7679 days (21.02 yr)      first obs. used      1999-04-18      last obs. used      2020-04-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55685      source      ORB      producer      Otto Matic      solution date      2021-Apr-14 00:39:52   Additional Information  Earth MOID = 1.20067 au   Jupiter MOID = 2.4258 au   T_jup = 3.387  [ 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 16.64   n/a E2021B55   227464 (2005 WK120)          Discovered 2005-Nov-29 by Mt. Lemmon Survey at Mount Lemmon Reference: 20091202/Numbers.arc Last Updated: 2009-12-04 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-15 18:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin