+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   180331 (2003 YN21) Classification: Main-belt Asteroid          SPK-ID: 2180331 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07195492491750939 4.227e-08   a 2.416690460986779 1.7164e-08 au q 2.242797680317614 1.0285e-07 au i 13.82162508924497 6.6037e-06 deg node 293.0677156637815 1.9828e-05 deg peri 94.86869058902006 5.3183e-05 deg M 260.8160270237175 5.0155e-05 deg tp 2459578.567171874117 (2021-Dec-30.06717187) 0.00019295 TDB period 1372.239665245396 3.76 1.4619e-05 4.002e-08 d yr n .2623448433372764 2.7948e-09 deg/d Q 2.590583241655944 1.8399e-08 au   Orbit Determination Parameters    # obs. used (total)      211      data-arc span      6519 days (17.85 yr)      first obs. used      2002-07-21      last obs. used      2020-05-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53633      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 09:06:55   Additional Information  Earth MOID = 1.29669 au   Jupiter MOID = 2.72222 au   T_jup = 3.473  [ 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 16.39   n/a E2021B55   180331 (2003 YN21)          Discovered 2003-Dec-17 by Spacewatch at Kitt Peak Reference: 20080321/Numbers.arc Last Updated: 2008-03-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-11 10:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin