+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   190121 (2004 WJ8) Classification: Main-belt Asteroid          SPK-ID: 2190121 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04981551383986303 7.1943e-08   a 2.838729555858571 2.1981e-08 au q 2.69731678438107 2.0061e-07 au i 1.299395434334911 5.5977e-06 deg node 128.5690718143402 0.00028025 deg peri 249.338527289935 0.00028437 deg M 165.3465317628772 4.8666e-05 deg tp 2458398.125634725776 (2018-Oct-06.62563473) 0.00023559 TDB period 1746.966013856077 4.78 2.0291e-05 5.555e-08 d yr n .2060715532784592 2.3935e-09 deg/d Q 2.980142327336072 2.3076e-08 au   Orbit Determination Parameters    # obs. used (total)      325      data-arc span      9652 days (26.43 yr)      first obs. used      1994-10-11      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55735      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 22:06:18   Additional Information  Earth MOID = 1.69736 au   Jupiter MOID = 2.2552 au   T_jup = 3.308  [ 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 16.32   n/a E2021B55   190121 (2004 WJ8)          Discovered 2004-Nov-19 by CSS at Catalina Reference: 20080819/Numbers.arc Last Updated: 2008-08-25 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 14:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin