+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 112 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2383936917980964 3.2033e-08   a 2.596709989094967 4.6592e-09 au q 1.977670708265623 8.3467e-08 au i 8.08013891341615 3.9261e-06 deg node 192.9749888486234 2.6203e-05 deg peri 104.989814051529 2.7393e-05 deg M 340.8418594032705 8.7548e-06 deg tp 2459081.836308000281 (2020-Aug-20.33630800) 3.7213e-05 TDB period 1528.387931608556 4.18 4.1136e-06 1.126e-08 d yr n .2355422943055544 6.3395e-10 deg/d Q 3.21574926992431 5.77e-09 au   Orbit Determination Parameters    # obs. used (total)      2887      data-arc span      56769 days (155.43 yr)      first obs. used      1865-06-13      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4575      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:42   Additional Information  Earth MOID = .981015 au   Jupiter MOID = 2.09069 au   T_jup = 3.362  [ 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 MPO473760 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 [ show close-approach data ] Alternate Designations  A857 RB = 1949 TH = 1986 EN5 = 1990 HG4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-19 19:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin