+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   59 Elpis (A860 RA) Classification: Main-belt Asteroid          SPK-ID: 2000059 [ 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 114 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .118782068642792 2.4872e-08   a 2.713549604189289 5.6946e-09 au q 2.391228568838855 6.6516e-08 au i 8.639914587206986 2.5636e-06 deg node 170.0008696087205 2.3632e-05 deg peri 210.8516988897848 2.8231e-05 deg M 247.6888802654657 1.725e-05 deg tp 2459509.860579219809 (2021-Oct-22.36057922) 7.9e-05 TDB period 1632.695043487729 4.47 5.1395e-06 1.407e-08 d yr n .2204943301787549 6.9408e-10 deg/d Q 3.035870639539722 6.371e-09 au   Orbit Determination Parameters    # obs. used (total)      2881      data-arc span      56584 days (154.92 yr)      first obs. used      1865-12-09      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44951      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:44   Additional Information  Earth MOID = 1.39732 au   Jupiter MOID = 2.43446 au   T_jup = 3.335  [ 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 8.0   n/a MPO473760 IRAS observations used: 14 diameter diameter 165.119 km 4.506 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 13.671 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Debehogne, H.; Surdej, A.; Surdej, J. (1978) Astron. Astrophys. Suppl. Ser. 33, 1-5.] [Shevchenko, V.G.; Chiorny, V.G.; Kalashnikov, A.V.; Krugly, Yu.N.; et al. (1996) Astron. Astrophys. Suppl. Ser. 115, 475-479.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F. (2018) Minor Planet Bull. 45, 181-182.] [Pilcher, F. (2019) Minor Planet Bull. 46, 445-448.] [Pilcher, F. (2020) Minor Planet Bull. 47, 344-346.] geometric albedo albedo 0.044   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.662   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=17.13, mean=20.02, max.=21.48) deg. U-B UB 0.285   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=17.13, mean=20.02, max.=21.48) deg. Tholen spectral type spec_T CP   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B B   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) 59 Elpis (A860 RA)          Discovered 1860-Sep-12 by Chacornac, J. at Paris Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A860 RA = A900 SC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-20 14:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin