{"object":{"pha":false,"prefix":null,"kind":"an","orbit_id":"148","fullname":"190 Ismene (A878 SA)","shortname":"190 Ismene","orbit_class":{"name":"Outer Main-belt Asteroid","code":"OMB"},"neo":false,"des":"190","spkid":"20000190"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"orbit":{"n_del_obs_used":null,"equinox":"J2000","elements":[{"sigma":"4.4e-09","value":"0.168","name":"e","units":null,"label":"e","title":"eccentricity"},{"sigma":"1.5e-08","value":"4","name":"a","units":"au","label":"a","title":"semi-major axis"},{"label":"q","title":"perihelion distance","units":"au","name":"q","value":"3.32","sigma":"3e-08"},{"value":"6.17","sigma":"9.4e-08","label":"i","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","name":"i"},{"name":"om","units":"deg","title":"longitude of the ascending node","label":"node","sigma":"6.9e-07","value":"175"},{"sigma":"1e-06","value":"272","name":"w","units":"deg","label":"peri","title":"argument of perihelion"},{"title":"mean anomaly","label":"M","units":"deg","name":"ma","value":"220","sigma":"2.6e-06"},{"sigma":"2.7e-05","value":"2462333.392","title":"time of perihelion passage","label":"tp","units":"TDB","name":"tp"},{"value":"2920","sigma":"1.6e-05","units":"d","name":"per","label":"period","title":"sidereal orbital period"},{"label":"n","title":"mean motion","units":"deg/d","name":"n","value":"0.123","sigma":"6.9e-10"},{"sigma":"1.7e-08","value":"4.67","units":"au","name":"ad","label":"Q","title":"aphelion distance"}],"first_obs":"1893-09-08","two_body":null,"last_obs":"2026-04-14","source":"JPL","orbit_id":"148","not_valid_before":null,"producer":"Otto Matic","epoch":"2461200.5","soln_date":"2026-06-05 03:15:51","rms":"0.24","n_dop_obs_used":null,"moid":"2.35","sb_used":"SB441-N16","t_jup":"3.020","condition_code":"0","n_obs_used":12627,"comment":null,"moid_jup":"0.764","model_pars":[],"pe_used":"DE441","data_arc":"48430","cov_epoch":"2457892.5","not_valid_after":null},"discovery":{"date":"1878-Sep-22","ref":"DISCOVERY.DB","location":"Clinton","who":"Peters, C. H. F.","name":null,"discovery":"Discovered 1878-09-22 by Peters, C. H. F. at Clinton","citation":null,"site":null,"cref":null}}