{"phys_par":[{"notes":"IRAS observations used: 4","value":"7.69","ref":"MPO980521","title":"absolute magnitude","units":null,"sigma":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"name":"diameter","desc":"effective body diameter","notes":null,"value":"110.997","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","title":"diameter","sigma":"1.378","units":"km"},{"desc":"body rotation period (synodic)","name":"rot_per","units":"h","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","value":"13.59","notes":"REFERENCE LIST:[Harris, A.W.; Young, J. (1979) Icarus 38, 100-105.], [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.], [Denchev, P.; Magnusson, P.; Donchev, Z. (1998) Planet. Space Sci. 46, 673-682.], [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.], [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.], [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.], [Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.]"},{"value":"0.139","notes":null,"sigma":"0.024","units":null,"title":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","desc":"geometric albedo","name":"albedo"},{"name":"BV","desc":"color index B-V magnitude difference","title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","units":null,"sigma":"0.012","notes":"#obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg.","value":"0.874"},{"notes":"#obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg.","value":"0.462","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B","units":null,"sigma":"0.022","name":"UB","desc":"color index U-B magnitude difference"},{"desc":"Tholen spectral taxonomic classification","name":"spec_T","units":null,"sigma":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"Tholen spectral type","value":"S","notes":"used 7 color indices; used ground-based radiometric albedo"},{"name":"spec_B","desc":"SMASSII spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","units":null,"sigma":null,"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","value":"L"}],"orbit":{"pe_used":"DE441","orbit_id":"140","comment":null,"cov_epoch":"2457915.5","producer":"Otto Matic","two_body":null,"n_dop_obs_used":null,"not_valid_before":null,"data_arc":"62017","model_pars":[],"epoch":"2461200.5","moid":"0.904","elements":[{"value":"0.222","units":null,"sigma":"2.4e-09","title":"eccentricity","label":"e","name":"e"},{"value":"2.44","sigma":"1.4e-09","units":"au","title":"semi-major axis","label":"a","name":"a"},{"name":"q","label":"q","title":"perihelion distance","sigma":"5.9e-09","units":"au","value":"1.9"},{"label":"i","name":"i","value":"8.5","title":"inclination; angle with respect to x-y ecliptic plane","sigma":"2.1e-07","units":"deg"},{"label":"node","name":"om","value":"84.1","sigma":"1.7e-06","units":"deg","title":"longitude of the ascending node"},{"name":"w","label":"peri","units":"deg","sigma":"1.7e-06","title":"argument of perihelion","value":"238"},{"name":"ma","label":"M","value":"154","units":"deg","sigma":"1.1e-06","title":"mean anomaly"},{"name":"tp","label":"tp","title":"time of perihelion passage","units":"TDB","sigma":"3.9e-06","value":"2460601.818"},{"value":"1400","title":"sidereal orbital period","units":"d","sigma":"1.2e-06","name":"per","label":"period"},{"value":"0.258","units":"deg/d","sigma":"2.2e-10","title":"mean motion","label":"n","name":"n"},{"name":"ad","label":"Q","value":"2.99","units":"au","sigma":"1.7e-09","title":"aphelion distance"}],"soln_date":"2026-06-05 03:04:51","not_valid_after":null,"equinox":"J2000","last_obs":"2026-04-07","rms":"0.34","moid_jup":"2.35","first_obs":"1856-06-20","n_obs_used":9006,"t_jup":"3.450","source":"JPL","sb_used":"SB441-N16","n_del_obs_used":null,"condition_code":"0"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"des":"42","shortname":"42 Isis","orbit_id":"140","kind":"an","neo":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"spkid":"20000042","pha":false,"prefix":null,"fullname":"42 Isis (A856 KB)"}}