+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18403 Atsuhirotaisei (1993 AG) Classification: Main-belt Asteroid          SPK-ID: 2018403 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3102437660975226 3.3011e-08   a 2.635312061333173 1.0191e-08 au q 1.817722922582944 8.5023e-08 au i 3.661496769357678 5.1251e-06 deg node 174.062469921798 6.4236e-05 deg peri 312.0380001547807 6.5093e-05 deg M 187.9881850532589 1.1546e-05 deg tp 2459947.124572211983 (2023-Jan-02.62457221) 5.2584e-05 TDB period 1562.595255910392 4.28 9.0644e-06 2.482e-08 d yr n .2303859548007257 1.3364e-09 deg/d Q 3.452901200083402 1.3353e-08 au   Orbit Determination Parameters    # obs. used (total)      1219      data-arc span      14821 days (40.58 yr)      first obs. used      1979-12-18      last obs. used      2020-07-16      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54129      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:28:36   Additional Information  Earth MOID = .835302 au   Jupiter MOID = 1.64308 au   T_jup = 3.325  [ 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 14.83   n/a E2021B10   diameter diameter 2.736 km 0.062 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.314   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18403 Atsuhirotaisei           Discovered 1993 Jan. 13 by K. Endate and K. Watanabe at Kitami. Atsuhiro Ikuta (1999-2011) and Taisei Ikuta (2003-2011) were two brothers who loved the stars. They died in an automobile accident on the night of 2011 December 10, on their return home from viewing a total lunar eclipse. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20120831/MPCPages.arc Last Updated: 2012-09-04 [ show close-approach data ] Alternate Designations  1993 AG = 1979 YG4 = 2000 SB109  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 18:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin