+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   56 Melete (A857 RB) Classification: Main-belt Asteroid          SPK-ID: 2000056 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 116 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2382822250551914 2.3033e-08   a 2.596254806263812 4.1504e-09 au q 1.977613434217036 6.079e-08 au i 8.081337060540127 4.7839e-07 deg node 192.9525665816821 7.4155e-06 deg peri 104.9409225303002 7.9325e-06 deg M 28.00091004170568 2.6127e-06 deg tp 2459081.652775818666 (2020-Aug-20.15277582) 1.1046e-05 TDB period 1527.986077650854 4.18 3.6639e-06 1.003e-08 d yr n .2356042409453553 5.6495e-10 deg/d Q 3.214896178310588 5.1393e-09 au   Orbit Determination Parameters    # obs. used (total)      3060      data-arc span      56827 days (155.58 yr)      first obs. used      1865-06-13      last obs. used      2021-01-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44963      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:47:12   Additional Information  Earth MOID = .97906 au   Jupiter MOID = 2.0906 au   T_jup = 3.363  [ 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 8.51   n/a E2021B10 IRAS observations used: 26 diameter diameter 121.333 km 0.947 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 18.147 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.] [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2007) Minor Planet Bull. 34, 104-107.] [Pilcher, F.; Jardine, D. (2009) Minor Planet Bull. 36, 52-54.] [Warner, B.D. (2011) http://www.minorplanetobserver.com/PDO/PDOLightcurves.htm] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.057   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.697   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.79, mean=12.85, max.=28.04) deg. U-B UB 0.312   0.039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.79, mean=12.85, max.=28.04) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Xk   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) 56 Melete (A857 RB)          Discovered 1857-Sep-09 by Goldschmidt, H. at Paris Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A857 RB = 1949 TH = 1986 EN5 = 1990 HG4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-May-08 17:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin