+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   108 Hecuba Classification: Outer Main-belt Asteroid          SPK-ID: 2000108 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05485697013097868 4.6225e-08   a 3.23626045516854 1.7297e-08 AU q 3.058729012043292 1.4534e-07 AU i 4.221295168370423 6.4142e-06 deg node 350.029970203527 4.8747e-05 deg peri 203.869084440714 6.4922e-05 deg M 324.4269498858988 4.4249e-05 deg tp 2456610.627178976287 (2013-Nov-14.12717898) 0.00026035 JED period 2126.491380098925 5.82 1.7049e-05 4.668e-08 d yr n .1692929505236239 1.3573e-09 deg/d Q 3.413791898293788 1.8246e-08 AU   Orbit Determination Parameters    # obs. used (total)      1465      data-arc span      48653 days (133.20 yr)      first obs. used      1880-01-26      last obs. used      2013-04-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .61454      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:32:23   Additional Information  Earth MOID = 2.05867 AU   T_jup = 3.178  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.09 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14 diameter diameter 64.97 km 4.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14 rotation period rot_per 17.859 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Warner, B.D. (2007) Minor Planet Bul. 34, 72-77.] geometric albedo albedo 0.2431   0.037 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14 B-V BV .855 mag .013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=2.51, mean=7.27, max.=10.66) deg. U-B UB .502 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=2.51, mean=7.27, max.=10.66) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Sl   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 108 Hecuba          Discovered 1869-Apr-02 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-20 03:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin