+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   33 Polyhymnia (A854 UB) Classification: Main-belt Asteroid          SPK-ID: 2000033 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3314689543146266 3.8816e-08   a 2.87405960679094 6.2027e-09 au q 1.92139807429004 1.103e-07 au i 1.852708161573494 4.3474e-06 deg node 8.45941250434856 0.00012276 deg peri 338.4144860057318 0.00012286 deg M 62.91487160237903 6.2053e-06 deg tp 2458689.476719901412 (2019-Jul-24.97671990) 3.0389e-05 TDB period 1779.68066982843 4.87 5.7612e-06 1.577e-08 d yr n .2022834804598433 6.5484e-10 deg/d Q 3.826721139291839 8.2587e-09 au   Orbit Determination Parameters    # obs. used (total)      3270      data-arc span      60195 days (164.80 yr)      first obs. used      1856-01-25      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4783      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:34   Additional Information  Earth MOID = .914781 au   Jupiter MOID = 1.60332 au   T_jup = 3.212  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.5   n/a MPO502153   magnitude slope G 0.33   n/a PDS3 (MPC 17257) Fit diameter diameter 52.929 km 2.304 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 18.608 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Zappala, V.; Scaltriti, F.; Lagerkvist, C.-I.; Rickman, H.; Harris, A.W. (1982) Icarus 52, 196-201.] [Pilcher, F. (2009) Minor Planet Bull. 36, 25-27.] [Pilcher, F. (2011) Minor Planet Bull. 38, 130-131.] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Ferrero, A. (2012) Minor Planet Bull. 39, 138-139.] [Pilcher, F. (2018) Minor Planet Bull. 45, 356-359.] [Franco, L.; Pilcher, F.; Ferrero, A.; Maurice, A. (2020) Minor Planet Bull. 47, 120-122.] [Pilcher, F. (2020) Minor Planet Bull. 47, 34-36.] geometric albedo albedo 0.240   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.848   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.07, mean=8.93, max.=15.71) deg. U-B UB 0.438   0.056 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.07, mean=8.93, max.=15.71) 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 Sq   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) 33 Polyhymnia (A854 UB)          Discovered 1854-Oct-28 by Chacornac, J. at Paris Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A854 UB = 1938 FE = 1953 AK = 1957 YL = 1963 DG = 1976 YT7 = A887 HA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 03:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin