+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6 Hebe (A847 NA) Classification: Main-belt Asteroid          SPK-ID: 2000006 [ 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 90 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2032188264180952 1.9782e-08   a 2.424532678755148 2.7439e-09 au q 1.931821993166206 4.8107e-08 au i 14.73965334606789 2.1889e-06 deg node 138.6434314054466 1.1212e-05 deg peri 239.7362734413622 1.2992e-05 deg M 190.6864962597471 7.3902e-06 deg tp 2459649.029276565098 (2022-Mar-10.52927657) 2.8748e-05 TDB period 1378.924506350107 3.78 2.3409e-06 6.409e-09 d yr n .2610730307149944 4.432e-10 deg/d Q 2.91724336434409 3.3016e-09 au   Orbit Determination Parameters    # obs. used (total)      6113      data-arc span      62733 days (171.75 yr)      first obs. used      1848-09-05      last obs. used      2020-06-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41117      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:05:45   Additional Information  Earth MOID = .973673 au   Jupiter MOID = 2.63933 au   T_jup = 3.439  [ 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 5.8   n/a MPO473760 IRAS observations used: 18 magnitude slope G 0.24   n/a PDS3 (MPC 17257) Fit diameter diameter 185.18 km 2.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 rotation period rot_per 7.2745 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Ahmad, I.I. (1954) Astrophys. J. 120, 551-560.] [Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.] [Gehrels, T.; Taylor, R.C. (1977) Astron. J. 82, 229-237.] [Di Martino, M.; Cacciatori, S. (1984) Icarus 60, 75-82.] [Magnusson, P. (1986) Icarus 68, 1-39.] [Gil Hutton, R.; Blain, A. (1988) Minor Planet Bull. 15, 3-4.] [Michalowski, T. (1988) Acta Astronomica 38, 455-468.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.] [Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Marset, M.; Carry, B.; Dumas, C.; Hanus, J.; et al. (2017) Astron. Astrophys. 604, A64.] geometric albedo albedo 0.2679   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 B-V BV 0.822   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=27; phase (min.=1.33, mean=14.50, max.=28.87) deg. U-B UB 0.399   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=24; phase (min.=1.33, mean=14.33, max.=28.87) 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 S   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) 6 Hebe (A847 NA)          Discovered 1847-Jul-01 by Hencke, K. L. at Driesen Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A847 NA = 1947 JB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-15 18:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin