+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1414204704644045 3.0921e-08   a 2.573470808837042 1.0564e-08 au q 2.209529356324896 8.2605e-08 au i 6.278826974337153 5.2258e-06 deg node 227.2099356017575 4.479e-05 deg peri 236.2026846151379 5.1488e-05 deg M 334.6459837861764 2.6345e-05 deg tp 2459502.699276822288 (2021-Oct-15.19927682) 0.00011062 TDB period 1507.916510488737 4.13 9.285e-06 2.542e-08 d yr n .2387400081476121 1.47e-09 deg/d Q 2.937412261349188 1.2058e-08 au   Orbit Determination Parameters    # obs. used (total)      1406      data-arc span      15093 days (41.32 yr)      first obs. used      1979-10-18      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50155      source      ORB      producer      Otto Matic      solution date      2021-Jul-09 09:57:07   Additional Information  Earth MOID = 1.23375 au   Jupiter MOID = 2.24013 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 14.60   n/a MPCxxxxx   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-Aug-03 16:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin