+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   227449 (2005 WC54) Classification: Main-belt Asteroid          SPK-ID: 2227449 [ 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 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2055070522579189 3.4705e-08   a 2.636231977973667 1.8153e-08 au q 2.094467715112236 9.4162e-08 au i 4.468958550007343 4.0364e-06 deg node 84.28551483121241 7.3636e-05 deg peri 341.8531046072375 7.5494e-05 deg M 201.2303300055999 1.9908e-05 deg tp 2459890.007356148220 (2022-Nov-06.50735615) 9.162e-05 TDB period 1563.413517343168 4.28 1.6148e-05 4.421e-08 d yr n .2302653750952444 2.3784e-09 deg/d Q 3.177996240835099 2.1884e-08 au   Orbit Determination Parameters    # obs. used (total)      409      data-arc span      7242 days (19.83 yr)      first obs. used      2000-08-26      last obs. used      2020-06-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56821      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 02:26:47   Additional Information  Earth MOID = 1.10828 au   Jupiter MOID = 2.13734 au   T_jup = 3.363  [ 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 16.43   n/a E2021B55   227449 (2005 WC54)          Discovered 2005-Nov-25 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-13 22:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin