{"phys_par":[{"value":"7.93","ref":"E2026E47","title":"absolute magnitude","units":null,"sigma":null,"notes":"IRAS observations used: 8","name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"name":"diameter","notes":"IRAS observations used: 8","sigma":"3.8","desc":"effective body diameter","title":"diameter","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","value":"154.79","units":"km"},{"sigma":null,"notes":"REFERENCE LIST:[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.], [Lagerkvist, C.-I.; Schober, H.J. (1981) Astron. Astrophys. Suppl. Ser. 44, 401-404.], [Erikson, A.; Berthier, J.; Denchev, P.V.; Harris, A.W.; et al. (1999) Planet. Space Sci. 47, 327-330.], [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.], [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [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], [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.], [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.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.], [Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.], [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2020) Ap. J. Supl. Ser. 247, id.26.], [Martikainen, J.; Muinonen, K.; Penttila, A.; Cellino, A.; Wang, X.-B. (2021) Astron. Astrophys. 649, A98.]","name":"rot_per","desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","value":"6.875","units":"h"},{"desc":"geometric albedo","sigma":"0.003","notes":"IRAS observations used: 8","name":"albedo","units":null,"ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","title":"geometric albedo","value":"0.0666"},{"units":null,"value":"0.668","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"B-V","desc":"color index B-V magnitude difference","sigma":"0.023","notes":"#obs=8; phase (min.=6.05, mean=11.20, max.=19.29) deg.","name":"BV"},{"name":"UB","sigma":"0.015","notes":"#obs=7; phase (min.=6.05, mean=10.95, max.=19.29) deg.","desc":"color index U-B magnitude difference","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B","value":"0.294","units":null},{"units":null,"value":"FC","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"Tholen spectral type","desc":"Tholen spectral taxonomic classification","sigma":null,"notes":"used 7 color indices; used ground-based radiometric albedo","name":"spec_T"},{"value":"B","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","units":null,"name":"spec_B","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","sigma":null,"desc":"SMASSII spectral taxonomic classification"}],"orbit":{"comment":null,"moid_jup":"2.33","not_valid_before":null,"t_jup":"3.332","condition_code":"0","elements":[{"value":"0.193","name":"e","title":"eccentricity","sigma":"1.7e-09","units":null,"label":"e"},{"title":"semi-major axis","value":"2.65","name":"a","sigma":"1.6e-09","units":"au","label":"a"},{"label":"q","units":"au","sigma":"4.4e-09","title":"perihelion distance","value":"2.14","name":"q"},{"name":"i","value":"12","title":"inclination; angle with respect to x-y ecliptic plane","sigma":"1.4e-07","units":"deg","label":"i"},{"units":"deg","label":"node","title":"longitude of the ascending node","value":"203","name":"om","sigma":"5.3e-07"},{"sigma":"6.9e-07","name":"w","value":"123","title":"argument of perihelion","label":"peri","units":"deg"},{"title":"mean anomaly","value":"93.8","name":"ma","sigma":"9.3e-07","units":"deg","label":"M"},{"value":"2460788.975","name":"tp","title":"time of perihelion passage","sigma":"3.8e-06","units":"TDB","label":"tp"},{"units":"d","label":"period","name":"per","value":"1580","title":"sidereal orbital period","sigma":"1.4e-06"},{"sigma":"2e-10","title":"mean motion","name":"n","value":"0.228","label":"n","units":"deg/d"},{"label":"Q","units":"au","sigma":"1.9e-09","title":"aphelion distance","value":"3.17","name":"ad"}],"n_del_obs_used":null,"soln_date":"2026-06-05 03:08:12","n_dop_obs_used":null,"data_arc":"58625","epoch":"2461200.5","equinox":"J2000","orbit_id":"142","pe_used":"DE441","moid":"1.16","producer":"Otto Matic","source":"JPL","two_body":null,"first_obs":"1865-09-21","n_obs_used":8726,"last_obs":"2026-03-26","not_valid_after":null,"sb_used":"SB441-N16","rms":"0.31","model_pars":[],"cov_epoch":"2457734.5"},"object":{"shortname":"85 Io","spkid":"20000085","pha":false,"prefix":null,"des":"85","neo":false,"fullname":"85 Io (A865 SA)","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"kind":"an","orbit_id":"142"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"}}