{"object":{"pha":false,"kind":"an","prefix":null,"des":"45","spkid":"20000045","neo":false,"fullname":"45 Eugenia (A857 MA)","orbit_id":"150","orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"shortname":"45 Eugenia"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"phys_par":[{"title":"absolute magnitude","sigma":null,"ref":"MPO980521","units":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","notes":"IRAS observations used: 19","value":"7.74"},{"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","units":null,"name":"G","value":"0.07","notes":"Fit","title":"magnitude slope","ref":"PDS3 (MPC 17257)","sigma":null},{"title":"diameter","sigma":"2.168","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","name":"diameter","units":"km","desc":"effective body diameter","value":"202.327","notes":null},{"title":"rotation period","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","sigma":null,"desc":"body rotation period (synodic)","name":"rot_per","units":"h","notes":"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.], [Behrend, R. (2021) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Vernazza, P.; Ferrais, M.; Jorda, L.; Hanus, J.; et al. (2021) Astron. Astrophys 654, id. A56.], [Behrend, R. (2022) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Ferrais, M.; Vernazza, P.; Jorda, L.; Jehin, E.; et al. (2022) Minor Planet Bull. 49, 307-313.], [Behrend, R. (2023) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]","value":"5.699"},{"value":"0.045","notes":null,"name":"albedo","units":null,"desc":"geometric albedo","sigma":"0.006","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo"},{"title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","sigma":"0.018","units":null,"name":"BV","desc":"color index B-V magnitude difference","notes":"#obs=22; phase (min.=.00, mean=13.63, max.=22.83) deg.","value":"0.676"},{"value":"0.274","notes":"#obs=12; phase (min.=3.02, mean=12.35, max.=20.20) deg.","desc":"color index U-B magnitude difference","name":"UB","units":null,"sigma":"0.030","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B"},{"title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"name":"spec_T","units":null,"desc":"Tholen spectral taxonomic classification","value":"FC","notes":"used 7 color indices; used ground-based radiometric albedo"},{"title":"SMASSII spectral type","sigma":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","name":"spec_B","units":null,"desc":"SMASSII spectral taxonomic classification","value":"C","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)"}],"orbit":{"moid_jup":"2.07","n_obs_used":13144,"comment":null,"data_arc":"58395","cov_epoch":"2457978.5","not_valid_after":null,"model_pars":[],"pe_used":"DE441","sb_used":"SB441-N16","t_jup":"3.343","condition_code":"0","soln_date":"2026-06-05 03:05:02","not_valid_before":null,"producer":"Otto Matic","epoch":"2461200.5","moid":"1.5","rms":"0.27","n_dop_obs_used":null,"two_body":null,"n_del_obs_used":null,"equinox":"J2000","first_obs":"1866-05-19","elements":[{"units":null,"name":"e","label":"e","title":"eccentricity","value":"0.0814","sigma":"1.9e-09"},{"sigma":"2e-09","value":"2.72","label":"a","title":"semi-major axis","units":"au","name":"a"},{"title":"perihelion distance","label":"q","units":"au","name":"q","value":"2.5","sigma":"5.4e-09"},{"sigma":"1.8e-07","value":"6.61","units":"deg","name":"i","label":"i","title":"inclination; angle with respect to x-y ecliptic plane"},{"title":"longitude of the ascending node","label":"node","units":"deg","name":"om","value":"148","sigma":"1.7e-06"},{"name":"w","units":"deg","title":"argument of perihelion","label":"peri","sigma":"2.3e-06","value":"87.2"},{"title":"mean anomaly","label":"M","units":"deg","name":"ma","value":"251","sigma":"1.5e-06"},{"sigma":"6.8e-06","value":"2461699.735","title":"time of perihelion passage","label":"tp","units":"TDB","name":"tp"},{"title":"sidereal orbital period","label":"period","units":"d","name":"per","value":"1640","sigma":"1.8e-06"},{"title":"mean motion","label":"n","name":"n","units":"deg/d","value":"0.219","sigma":"2.4e-10"},{"name":"ad","units":"au","title":"aphelion distance","label":"Q","sigma":"2.1e-09","value":"2.94"}],"last_obs":"2026-04-05","source":"JPL","orbit_id":"150"}}