+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15688 (1981 UW23) Classification: Main-belt Asteroid          SPK-ID: 2015688 [ 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 58 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2022361614362926 3.4013e-08   a 2.593032391405469 1.031e-08 au q 2.068627474087656 8.9545e-08 au i 13.94444280298633 3.5437e-06 deg node 59.6470589298023 1.5766e-05 deg peri 283.4243534993619 1.7856e-05 deg M 130.8460590323009 9.7653e-06 deg tp 2458446.169869099934 (2018-Nov-23.66986910) 4.0212e-05 TDB period 1525.142206038932 4.18 9.0957e-06 2.49e-08 d yr n .2360435627409359 1.4077e-09 deg/d Q 3.117437308723281 1.2395e-08 au   Orbit Determination Parameters    # obs. used (total)      2403      data-arc span      14063 days (38.50 yr)      first obs. used      1981-10-24      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44867      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:13:55   Additional Information  Earth MOID = 1.11428 au   Jupiter MOID = 2.46854 au   T_jup = 3.349  [ 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 12.8   n/a MPO449065   diameter diameter 7.457 km 0.082 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   geometric albedo albedo 0.363   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   15688 (1981 UW23)          Discovered 1981-Oct-24 by Bus, S. J. at Palomar Reference: 20000726/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1981 UW23 = 1981 WS3 = 2000 ES103  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-15 14:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin