+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15729 Yumikoitahana (1990 UB) Classification: Main-belt Asteroid          SPK-ID: 2015729 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1696037010803361 2.9058e-08   a 2.285216585480088 7.0514e-09 au q 1.897635394812497 6.5986e-08 au i 3.20545825243758 3.4205e-06 deg node 284.9193395570234 7.0652e-05 deg peri 141.3878640806024 7.1711e-05 deg M 178.7041444905177 1.2553e-05 deg tp 2458374.143480866039 (2018-Sep-12.64348087) 4.3093e-05 TDB period 1261.79696352924 3.45 5.8402e-06 1.599e-08 d yr n .2853073912882796 1.3205e-09 deg/d Q 2.672797776147679 8.2473e-09 au   Orbit Determination Parameters    # obs. used (total)      1494      data-arc span      14432 days (39.51 yr)      first obs. used      1981-01-08      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50893      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:31:44   Additional Information  Earth MOID = .912738 au   Jupiter MOID = 2.61759 au   T_jup = 3.581  [ 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 14.9   n/a MPO332965   diameter diameter 6.240 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.055   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15729 Yumikoitahana           Discovered 1990 Oct. 16 by A. Takahashi and K. Watanabe at Kitami. Since their high-school days, Yumiko Itahana (b. 1965) worked together with the first discoverer and greatly influenced his astronomical career. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020921/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] Alternate Designations  1990 UB = 1981 AF2 = 1999 JL106  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-05 10:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin