+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1336888176095811 4.807e-08   a 2.635987303234977 1.0782e-08 au q 2.283585277431624 1.2575e-07 au i 11.85142668822789 4.1797e-06 deg node 85.18231488062246 1.9955e-05 deg peri 316.8194980333565 2.408e-05 deg M 145.1959177156556 1.488e-05 deg tp 2458370.028726690982 (2018-Sep-08.52872669) 6.3373e-05 TDB period 1563.195866399855 4.28 9.5906e-06 2.626e-08 d yr n .2302974360014808 1.4129e-09 deg/d Q 2.988389329038329 1.2223e-08 au   Orbit Determination Parameters    # obs. used (total)      2386      data-arc span      22476 days (61.54 yr)      first obs. used      1958-12-04      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39292      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:42:44   Additional Information  Earth MOID = 1.30884 au   Jupiter MOID = 2.39804 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 11.7   n/a MPO384769   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. 2019-August); 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.] 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 ] 2020-Jul-11 02:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin