+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   146678 (2001 UE221) Classification: Main-belt Asteroid          SPK-ID: 2146678 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01243655847179937 6.1385e-08   a 2.771088179762469 2.3074e-08 au q 2.73662537958434 1.7144e-07 au i 1.367575122205608 4.9765e-06 deg node 63.05150824506005 0.00023882 deg peri 105.554438268887 0.00031338 deg M 247.7863346054239 0.0002025 deg tp 2459525.690901197820 (2021-Nov-07.19090120) 0.00094736 TDB period 1684.899283580071 4.61 2.1044e-05 5.762e-08 d yr n .2136626227504072 2.6686e-09 deg/d Q 2.805550979940597 2.3361e-08 au   Orbit Determination Parameters    # obs. used (total)      304      data-arc span      8885 days (24.33 yr)      first obs. used      1992-11-28      last obs. used      2017-03-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59765      source      ORB      producer      Otto Matic      solution date      2018-Oct-04 05:47:20   Additional Information  Earth MOID = 1.73967 au   Jupiter MOID = 2.1519 au   T_jup = 3.337  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.3   n/a MPO453932   diameter diameter 4.008 km 0.540 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.033   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   146678 (2001 UE221)          Discovered 2001-Oct-23 by LINEAR at Socorro Reference: 20070106/Numbers.arc Last Updated: 2007-01-09 [ show close-approach data ] Alternate Designations  2001 UE221 = 2005 QC125  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-25 04:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin