+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 65 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2023857282739966 2.0581e-08   a 2.592799243802431 9.6483e-09 au q 2.068053680577208 5.359e-08 au i 13.94425766697541 5.404e-07 deg node 59.63784746935524 2.3373e-06 deg peri 283.4484660302202 4.8702e-06 deg M 178.0287768205347 4.4749e-06 deg tp 2458446.381715170909 (2018-Nov-23.88171517) 1.5837e-05 TDB period 1524.936515247453 4.18 8.5119e-06 2.33e-08 d yr n .2360754014350444 1.3177e-09 deg/d Q 3.117544807027653 1.1601e-08 au   Orbit Determination Parameters    # obs. used (total)      2687      data-arc span      14382 days (39.38 yr)      first obs. used      1981-10-24      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4372      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:05:49   Additional Information  Earth MOID = 1.1121 au   Jupiter MOID = 2.46889 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 12.84   n/a E2021B10   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 ] 2021-Apr-16 09:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin