+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11471 Toshihirabayashi (1981 EH48) Classification: Main-belt Asteroid          SPK-ID: 2011471 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1411032826778505 3.102e-08   a 2.573834185254274 1.0798e-08 au q 2.210657732646425 8.2774e-08 au i 6.278528898109325 5.2282e-06 deg node 227.2186218945954 4.5392e-05 deg peri 236.1144796862854 5.2014e-05 deg M 240.1576649375677 2.6206e-05 deg tp 2459502.584755958742 (2021-Oct-15.08475596) 0.00011102 TDB period 1508.235900535352 4.13 9.491e-06 2.598e-08 d yr n .2386894516117918 1.502e-09 deg/d Q 2.937010637862123 1.2321e-08 au   Orbit Determination Parameters    # obs. used (total)      1352      data-arc span      15003 days (41.08 yr)      first obs. used      1979-10-18      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50526      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:46:06   Additional Information  Earth MOID = 1.23465 au   Jupiter MOID = 2.24083 au   T_jup = 3.406  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.6   n/a MPO473922   diameter diameter 2.940 km 0.788 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.324   0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   11471 Toshihirabayashi           Discovered 1981 Mar. 6 by S. J. Bus at Siding Spring. Masatoshi Hirabayashi (b. 1983) is a postdoctoral researcher at Purdue University specializing in modeling structural stresses experienced by rotating asteroids and comet nuclei. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2017-03-12 Last Updated: 2017-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-15 17:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin