+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1690250624972217 2.8696e-08   a 2.2862898487256 6.9423e-09 au q 1.899849564157992 6.4998e-08 au i 3.20468082984013 3.4204e-06 deg node 284.9217320918747 6.8329e-05 deg peri 141.3485126734245 6.9389e-05 deg M 235.7654939487311 1.2265e-05 deg tp 2459636.247692299355 (2022-Feb-25.74769230) 4.3729e-05 TDB period 1262.685981646928 3.46 5.7512e-06 1.575e-08 d yr n .2851065151847573 1.2986e-09 deg/d Q 2.672730133293209 8.1157e-09 au   Orbit Determination Parameters    # obs. used (total)      1513      data-arc span      14432 days (39.51 yr)      first obs. used      1981-01-08      last obs. used      2020-07-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50582      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:07:25   Additional Information  Earth MOID = .914363 au   Jupiter MOID = 2.61787 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 14.95   n/a E2021B10   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 ] 2021-Apr-21 12:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin