{"phys_par":[{"notes":"IRAS observations used: 42","value":"6.17","ref":"MPO950952","title":"absolute magnitude","units":null,"sigma":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","name":"G","sigma":null,"units":null,"title":"magnitude slope","ref":"PDS3 (MPC 17258)","value":"0.37","notes":"Fit"},{"title":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","sigma":"0.425","units":"km","notes":null,"value":"148.970","name":"diameter","desc":"effective body diameter"},{"desc":"body rotation period (synodic)","name":"rot_per","sigma":null,"units":"h","title":"rotation period","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","value":"4.277","notes":"REFERENCE LIST:[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 529-546.], [Chang, Y.C.; Chang, C.-S. (1963) Acta Astron. Sin. 11, 139-149.], [Zappala, V.; van Houten-Groeneveld, I.; van Houten, C.J. (1979) Astron. Astrophys. Suppl. Ser. 35, 213-221.], [Magnusson, P. (1986) Icarus 68, 1-39.], [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.], [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. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.], [Ivarsen, K.; Willis, S.; Ingleby, L.; Matthews, D.; Simet, M. (2004) Minor Planet Bull. 31, 29-33.], [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.], [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.], [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.], [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2020) Ap. J. Supl. Ser. 247, id.26.], [Vernazza, P.; Ferrais, M.; Jorda, L.; Hanus, J.; et al. (2021) Astron. Astrophys 654, id. A56.], [Ferrais, M.; Vernazza, P.; Jorda, L.; Jehin, E.; et al. (2022) Minor Planet Bull. 49, 307-313.]"},{"units":null,"sigma":"0.052","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo","value":"0.201","notes":null,"desc":"geometric albedo","name":"albedo"},{"desc":"color index B-V magnitude difference","name":"BV","value":"0.949","notes":"#obs=53; phase (min.=1.54, mean=10.24, max.=20.96) deg.","sigma":"0.020","units":null,"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"B-V"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B","units":null,"sigma":"0.039","notes":"#obs=35; phase (min.=1.85, mean=9.20, max.=20.78) deg.","value":"0.601","name":"UB","desc":"color index U-B magnitude difference"},{"notes":"used 7 color indices; used ground-based radiometric albedo","value":"S","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"units":null,"name":"spec_T","desc":"Tholen spectral taxonomic classification"},{"name":"spec_B","desc":"SMASSII spectral taxonomic classification","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","value":"Sl","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","sigma":null,"units":null}],"orbit":{"orbit_id":"136","pe_used":"DE441","n_dop_obs_used":null,"two_body":null,"producer":"Otto Matic","cov_epoch":"2457788.5","comment":null,"moid":"1.5","epoch":"2461200.5","model_pars":[],"data_arc":"48663","not_valid_before":null,"soln_date":"2026-06-05 03:29:49","elements":[{"name":"e","label":"e","value":"0.112","title":"eccentricity","units":null,"sigma":"2.8e-09"},{"sigma":"2e-09","units":"au","title":"semi-major axis","value":"2.8","label":"a","name":"a"},{"value":"2.49","title":"perihelion distance","units":"au","sigma":"8.5e-09","label":"q","name":"q"},{"value":"18.4","units":"deg","sigma":"2.9e-07","title":"inclination; angle with respect to x-y ecliptic plane","label":"i","name":"i"},{"name":"om","label":"node","value":"140","title":"longitude of the ascending node","sigma":"9.2e-07","units":"deg"},{"label":"peri","name":"w","units":"deg","sigma":"1.7e-06","title":"argument of perihelion","value":"8.18"},{"name":"ma","label":"M","value":"158","title":"mean anomaly","sigma":"1.7e-06","units":"deg"},{"label":"tp","name":"tp","sigma":"7.7e-06","units":"TDB","title":"time of perihelion passage","value":"2460447.198"},{"title":"sidereal orbital period","sigma":"1.8e-06","units":"d","value":"1710","name":"per","label":"period"},{"value":"0.21","sigma":"2.2e-10","units":"deg/d","title":"mean motion","name":"n","label":"n"},{"name":"ad","label":"Q","title":"aphelion distance","sigma":"2.2e-09","units":"au","value":"3.11"}],"rms":"0.51","moid_jup":"1.92","last_obs":"2026-04-14","equinox":"J2000","not_valid_after":null,"n_obs_used":4613,"first_obs":"1893-01-18","source":"JPL","t_jup":"3.242","condition_code":"0","n_del_obs_used":null,"sb_used":"SB441-N16"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"fullname":"354 Eleonora (A893 BC)","pha":false,"prefix":null,"kind":"an","neo":false,"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"spkid":"20000354","des":"354","shortname":"354 Eleonora","orbit_id":"136"}}