{"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"discovery":{"date":"1897-Dec-18","citation":null,"cref":null,"who":"Charlois, A.","ref":"DISCOVERY.DB","location":"Nice","site":null,"name":null,"discovery":"Discovered 1897-12-18 by Charlois, A. at Nice"},"object":{"fullname":"431 Nephele (A897 YB)","prefix":null,"pha":false,"spkid":"20000431","orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"neo":false,"kind":"an","shortname":"431 Nephele","orbit_id":"96","des":"431"},"orbit":{"rms":"0.29","moid_jup":"1.68","last_obs":"2026-04-07","equinox":"J2000","not_valid_after":null,"n_obs_used":9784,"first_obs":"1902-10-07","source":"JPL","t_jup":"3.185","condition_code":"0","n_del_obs_used":null,"sb_used":"SB441-N16","orbit_id":"96","pe_used":"DE441","n_dop_obs_used":null,"two_body":null,"producer":"Otto Matic","cov_epoch":"2458351.5","comment":null,"moid":"1.59","epoch":"2461200.5","model_pars":[],"data_arc":"45108","not_valid_before":null,"soln_date":"2026-06-05 03:35:24","elements":[{"value":"0.173","title":"eccentricity","sigma":"1.2e-09","units":null,"label":"e","name":"e"},{"name":"a","label":"a","units":"au","sigma":"3.4e-09","title":"semi-major axis","value":"3.15"},{"label":"q","name":"q","value":"2.6","title":"perihelion distance","units":"au","sigma":"4.9e-09"},{"label":"i","name":"i","value":"1.83","sigma":"1e-07","units":"deg","title":"inclination; angle with respect to x-y ecliptic plane"},{"name":"om","label":"node","title":"longitude of the ascending node","sigma":"2.8e-06","units":"deg","value":"117"},{"value":"219","units":"deg","sigma":"2.9e-06","title":"argument of perihelion","label":"peri","name":"w"},{"title":"mean anomaly","units":"deg","sigma":"5.6e-07","value":"145","name":"ma","label":"M"},{"name":"tp","label":"tp","title":"time of perihelion passage","units":"TDB","sigma":"2.2e-06","value":"2460377.839"},{"title":"sidereal orbital period","units":"d","sigma":"3.3e-06","value":"2040","name":"per","label":"period"},{"label":"n","name":"n","value":"0.177","title":"mean motion","units":"deg/d","sigma":"2.9e-10"},{"name":"ad","label":"Q","value":"3.69","title":"aphelion distance","sigma":"4e-09","units":"au"}]}}
