+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   45 Eugenia (A857 MA) Classification: Main-belt Asteroid          SPK-ID: 2000045 [ 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 .08398302452502254 3.147e-08   a 2.719651834478199 5.2119e-09 au q 2.491247247763694 8.6208e-08 au i 6.605435861668967 3.1258e-06 deg node 147.5983615611948 3.077e-05 deg peri 87.79270452390622 3.6141e-05 deg M 170.6230397331657 1.9764e-05 deg tp 2458424.067750350639 (2018-Nov-01.56775035) 8.9332e-05 TDB period 1638.205545457984 4.49 4.7091e-06 1.289e-08 d yr n .2197526439817763 6.3169e-10 deg/d Q 2.948056421192705 5.6496e-09 au   Orbit Determination Parameters    # obs. used (total)      3913      data-arc span      56553 days (154.83 yr)      first obs. used      1866-05-19      last obs. used      2021-03-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46605      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:46:11   Additional Information  Earth MOID = 1.48952 au   Jupiter MOID = 2.06398 au   T_jup = 3.344  [ 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 7.63   n/a E2021B10 IRAS observations used: 19 magnitude slope G 0.07   n/a PDS3 (MPC 17257) Fit diameter diameter 202.327 km 2.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.699 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J. (1979) Icarus 38, 100-105.] [Debehogne, H.; Zappala, V. (1980) Astron. Astrophys. Suppl. Ser. 40, 257-258.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.] [Taylor, R.C.; Birch, P.V.; Pospieszalska-Surdej, A.; Surdej, J. (1988) Icarus 73, 314-323.] [Gil-Hutton, R. (1989) Minor Planet Bull. 16, 16-17.] [Magnusson, P. (1990) Icarus 85, 229-240.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Behrend, R. (1998) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Harris, A.W.; Young, J.W.; Bowell, E.; Tholen, D.J. (1999) Icarus 142, 173-201.] [Lopez-Gonzalez, M.J.; Rodriguez, E. (1999) Astron. Astrophys. Suppl. Ser. 139, 565-574.] [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Behrend, R. (2014) 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.] [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.] geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.676   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=22; phase (min.=.00, mean=13.63, max.=22.83) deg. U-B UB 0.274   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=12; phase (min.=3.02, mean=12.35, max.=20.20) deg. Tholen spectral type spec_T FC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B C   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) 45 Eugenia (A857 MA)          Discovered 1857-Jun-27 by Goldschmidt, H. at Paris Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A857 MA = 1941 BN  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-21 23:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin