+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173710 (2001 QU121) Classification: Main-belt Asteroid          SPK-ID: 2173710 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1080593331717899 6.6144e-08   a 2.772020080690344 1.9376e-08 au q 2.472477439232134 1.7612e-07 au i 6.364879618097445 6.6634e-06 deg node 350.7925839031122 4.3436e-05 deg peri 17.73555658078203 5.1593e-05 deg M 74.87833258542221 2.4057e-05 deg tp 2459045.871956022321 (2020-Jul-15.37195602) 0.00011297 TDB period 1685.749287859262 4.62 1.7675e-05 4.839e-08 d yr n .2135548877835594 2.2391e-09 deg/d Q 3.071562722148553 2.147e-08 au   Orbit Determination Parameters    # obs. used (total)      437      data-arc span      7114 days (19.48 yr)      first obs. used      2001-08-10      last obs. used      2021-01-31      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51532      source      ORB      producer      Otto Matic      solution date      2021-Jul-09 11:20:30   Additional Information  Earth MOID = 1.47116 au   Jupiter MOID = 2.39013 au   T_jup = 3.319  [ 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 16.01   n/a MPCxxxxx   173710 (2001 QU121)          Discovered 2001-Aug-19 by LINEAR at Socorro Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-28 12:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin