{"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"sigma":"0.9","ref":"73","title":"comet total magnitude","name":"M1","notes":"2 parameter fit from 45 observations, autocmod 2.9c","value":"7.4","units":null,"desc":"absolute magnitude of comet and coma (i.e. total)"},{"sigma":null,"title":"comet total magnitude slope","ref":"73","notes":"autocmod 2.9c","value":"10.75","name":"K1","units":null,"desc":"comet total magnitude slope parameter"},{"units":null,"desc":"absolute magnitude of comet nucleus","notes":"from 5 observations, autocmod 2.9c","value":"11.1","name":"M2","title":"comet nuclear magnitude","ref":"73","sigma":"0.001"},{"units":null,"desc":"comet nuclear magnitude slope parameter","notes":"autocmod 2.9c","value":"5.","name":"K2","title":"comet nuclear magnitude slope","ref":"73","sigma":null},{"sigma":null,"title":"comet nuclear phase coefficient","ref":"73","value":"0.03","notes":"autocmod 2.9c","name":"PC","desc":"comet nuclear magnitude law phase coefficient","units":null},{"sigma":null,"title":"diameter","ref":"DASTCOM","value":"4.2","notes":"value unverified","name":"diameter","desc":"effective body diameter","units":"km"}],"orbit":{"pe_used":"DE441","soln_date":"2021-04-15 23:29:47","sb_used":"SB441-N16","equinox":"J2000","cov_epoch":"2450157.5","n_dop_obs_used":null,"t_jup":"-0.338","n_obs_used":977,"orbit_id":"73","moid":"0.101","comment":null,"moid_jup":"1.99","first_obs":"1996-01-01","n_del_obs_used":null,"elements":[{"units":null,"title":"eccentricity","label":"e","name":"e","sigma":"1.1e-06","value":"1"},{"title":"semi-major axis","units":"au","value":"2120","sigma":"21","name":"a","label":"a"},{"title":"perihelion distance","units":"au","value":"0.23","sigma":"9e-07","name":"q","label":"q"},{"sigma":"6.4e-05","value":"125","label":"i","name":"i","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg"},{"units":"deg","title":"longitude of the ascending node","label":"node","name":"om","sigma":"1.2e-05","value":"188"},{"title":"argument of perihelion","units":"deg","sigma":"0.00016","value":"130","label":"peri","name":"w"},{"sigma":"7.2e-06","value":"360","label":"M","name":"ma","title":"mean anomaly","units":"deg"},{"label":"tp","name":"tp","sigma":"1.6e-05","value":"2450204.894","units":"TDB","title":"time of perihelion passage"},{"units":"d","title":"sidereal orbital period","name":"per","label":"period","value":"3.58e+07","sigma":"540000"},{"title":"mean motion","units":"deg/d","value":"1.01e-05","sigma":"1.5e-07","name":"n","label":"n"},{"label":"Q","name":"ad","sigma":"43","value":"4250","units":"au","title":"aphelion distance"}],"condition_code":null,"epoch":"2450157.5","model_pars":[{"sigma":"5.417E-10","title":"non-grav. radial accel.","kind":"EST","value":"2.688e-08","n":1,"name":"A1","desc":"non-gravitational radial acceleration parameter","units":"au/d^2"},{"units":"au/d^2","desc":"non-gravitational transverse acceleration parameter","value":"6.515e-10","n":2,"name":"A2","title":"non-grav. transverse accel.","kind":"EST","sigma":"9.876E-11"}],"not_valid_before":null,"data_arc":"306","source":"JPL","two_body":null,"not_valid_after":null,"producer":"Otto Matic","rms":"0.71","last_obs":"1996-11-02"},"object":{"prefix":"C","orbit_id":"73","orbit_class":{"code":"COM","name":"Comet"},"fullname":"C/1996 B2 (Hyakutake)","pha":false,"des":"1996 B2","neo":false,"kind":"cu","spkid":"1000131"}}