+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2245 Hekatostos (1968 BC) Classification: Main-belt Asteroid          SPK-ID: 2002245 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1337788243930877 4.8013e-08   a 2.635726614637921 1.0709e-08 au q 2.283122206710087 1.256e-07 au i 11.85167286035373 4.1498e-06 deg node 85.18047963118339 1.9926e-05 deg peri 316.770337992488 2.4005e-05 deg M 191.3222329657773 1.494e-05 deg tp 2459932.825762052527 (2022-Dec-19.32576205) 6.6657e-05 TDB period 1562.963981408533 4.28 9.5256e-06 2.608e-08 d yr n .2303316034676438 1.4038e-09 deg/d Q 2.988331022565755 1.2142e-08 au   Orbit Determination Parameters    # obs. used (total)      2477      data-arc span      22691 days (62.12 yr)      first obs. used      1958-12-04      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38869      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:05:12   Additional Information  Earth MOID = 1.30756 au   Jupiter MOID = 2.39906 au   T_jup = 3.355  [ 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 11.83   n/a E2021B10   diameter diameter 29.28 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 rotation period rot_per 20.61 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Klinglesmith, D.A. III; DeHart, A.; Hanowell, J.; Hendrickx, S. (2015) Minor Planet Bull. 42, 158-159.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.0622   0.005 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 2245 Hekatostos           Discovered 1968 Jan. 24 by L. I. Chernykh at the Crimean Astrophysical Observatory. The Greek ordinal number acknowledges this as the 100th minor planet to be numbered as a result of the joint observational program of the Institute for Theoretical Astronomy in Leningrad and the Crimean Astrophysical Observatory at Nauchnij. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5850 Last Updated: 2006-03-21 Alternate Designations  1968 BC = 1930 FA = 1958 XC = 1966 QV = 1971 XC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-28 07:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin