+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   118304 (1998 UQ20) Classification: Main-belt Asteroid          SPK-ID: 2118304 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2587686648779035 8.862e-08   a 2.302851204287256 6.101e-09 au q 1.706945472741371 2.0323e-07 au i .9968353888548448 4.7941e-06 deg node 96.07841343770227 0.00027286 deg peri 265.0769406942488 0.00027315 deg M 145.9698698946357 1.4399e-05 deg tp 2458682.943266402139 (2019-Jul-18.44326640) 5.0328e-05 TDB period 1276.430706074617 3.49 5.0725e-06 1.389e-08 d yr n .2820364617418999 1.1208e-09 deg/d Q 2.898756935833142 7.6797e-09 au   Orbit Determination Parameters    # obs. used (total)      703      data-arc span      7789 days (21.33 yr)      first obs. used      1998-10-18      last obs. used      2020-02-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52807      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 18:12:28   Additional Information  Earth MOID = .702744 au   Jupiter MOID = 2.55687 au   T_jup = 3.545  [ 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 16.25   n/a E2021B55   118304 (1998 UQ20)          Discovered 1998-Oct-28 by Korlevic, K. at Visnjan Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-13 05:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin