+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15 Eunomia (A851 OA) Classification: Main-belt Asteroid          SPK-ID: 2000015 [ 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 83 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1863457325340812 2.55e-08   a 2.644255449261366 3.2645e-09 au q 2.151509730561521 6.7204e-08 au i 11.75338145992145 2.4326e-06 deg node 292.9352671843799 1.3463e-05 deg peri 98.61791691608779 1.4944e-05 deg M 60.8458288501527 7.2324e-06 deg tp 2458935.050537904942 (2020-Mar-26.55053790) 3.1305e-05 TDB period 1570.55640723647 4.30 2.9084e-06 7.963e-09 d yr n .2292181282641425 4.2447e-10 deg/d Q 3.137001167961211 3.8728e-09 au   Orbit Determination Parameters    # obs. used (total)      2667      data-arc span      61928 days (169.55 yr)      first obs. used      1851-09-02      last obs. used      2021-03-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56539      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:43:22   Additional Information  Earth MOID = 1.19387 au   Jupiter MOID = 2.41825 au   T_jup = 3.339  [ 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 5.37   n/a MPCxxxxx IRAS observations used: 21 magnitude slope G 0.23   n/a PDS3 (MPC 17257) Fit diameter diameter 231.689 km 2.234 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.083 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.] [Cailliate, C. (1956) Publ. Observ. Lyon 3, fasc. 28.] [Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.] [Cailliate, C. (1960) Bull. Astronomique XXIII, fasc. III.] [Scaltriti, F.; Zappala, V. (1975) Astron. Astrophys. Suppl. Ser. 19, 249-255.] [Chang, Y.C.; Zhou, X.-h.; Yang, X.-y.; Zhang, Y.-y.; et al. (1981) Acta Astron. Sin. 22, 169-173; Chin. Astron. Astrophys. 5, 434-437.] [Lupishko, D.F.; Belskaja, I.N.; Velichko, F.P. (1985) Vestn. Kharkov Univ. 278, 51-56.] [Magnusson, P. (1986) Icarus 68, 1-39.] [Melillo, F.J. (1986) Minor Planet Bull. 13, 21-22.] [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.] [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.] [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1989) Astron. Astrophys. Suppl. Ser. 78, 519-532.] [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. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.] [Michalowski, T. (1993) Icarus 106, 563-572.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.] [Nathues, A.; Mottola, S.; Kaasalainen, M.; Neukum, G. (2005) Icarus 175, 452-463.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] [Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.] geometric albedo albedo 0.248   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.839   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=3.66, mean=16.49, max.=25.91) deg. U-B UB 0.451   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=15; phase (min.=6.04, mean=19.34, max.=25.91) 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 S   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) 15 Eunomia (A851 OA)          Discovered 1851-Jul-29 by De Gasparis, A. at Naples Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-May-06 14:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin