{"orbit":{"orbit_id":"48","n_obs_used":1075,"elements":[{"sigma":"4.7755E-12","value":".07969229514816586","title":"eccentricity","label":"e","units":null,"name":"e"},{"units":"au","title":"semi-major axis","label":"a","name":"a","sigma":"1.0134E-11","value":"2.765552595034094"},{"value":"2.545159361382861","sigma":"1.9113E-11","name":"q","label":"q","title":"perihelion distance","units":"au"},{"sigma":"4.6124E-9","value":"10.58802780183462","title":"inclination; angle with respect to x-y ecliptic plane","label":"i","units":"deg","name":"i"},{"sigma":"6.1807E-8","value":"80.24862682043221","units":"deg","title":"longitude of the ascending node","label":"node","name":"om"},{"sigma":"6.6076E-8","value":"73.29421453021587","label":"peri","title":"argument of perihelion","units":"deg","name":"w"},{"value":"274.4193463761342","sigma":"6.1728E-9","name":"ma","title":"mean anomaly","label":"M","units":"deg"},{"units":"TDB","label":"tp","title":"time of perihelion passage","name":"tp","sigma":"2.8446E-8","value":"2461599.841466614066"},{"value":"1679.853119758983","sigma":"9.2333E-9","name":"per","units":"d","label":"period","title":"sidereal orbital period"},{"units":"deg/d","label":"n","title":"mean motion","name":"n","sigma":"1.1779E-12","value":".21430445064843"},{"sigma":"1.0942E-11","value":"2.985945828685327","title":"aphelion distance","label":"Q","units":"au","name":"ad"}],"soln_date":"2021-04-13 11:04:44","moid_jup":"2.0967","cov_epoch":"2458849.5","producer":"Davide Farnocchia","not_valid_after":null,"sb_used":"SB441-N373","n_dop_obs_used":0,"not_valid_before":null,"first_obs":"1995-01-05","model_pars":[],"source":"JPL","comment":null,"two_body":null,"equinox":"J2000","t_jup":"3.310","data_arc":"9520","rms":".43153","last_obs":"2021-01-28","condition_code":"0","moid":"1.58107","epoch":"2461200.5","n_del_obs_used":60,"pe_used":"DE441"},"phys_par":[{"sigma":null,"title":"absolute magnitude","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","name":"H","value":"3.34","ref":"MPO980521","notes":"IRAS observations used: 15","units":null},{"sigma":null,"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","title":"magnitude slope","name":"G","ref":"PDS3 (MPC 17257)","value":"0.12","notes":"Fit","units":null},{"value":"939.4","ref":"Nature vol. 537, pp515-517 (22 September 2016)","units":"km","notes":null,"sigma":"0.2","title":"diameter","desc":"effective body diameter","name":"diameter"},{"sigma":"0.2 x 0.2 x 0.2","name":"extent","title":"extent","desc":"tri(or bi)-axial body dimensions","value":"964.4 x 964.2 x 891.8","ref":"Nature vol. 537, pp515-517 (22 September 2016)","notes":"fit w.r.t. center of mass and in body-fixed frame","units":"km"},{"ref":"Nature vol. 537, pp515-517 (22 September 2016)","value":"62.6284","notes":null,"units":"km^3/s^2","sigma":"0.0009","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","title":"GM","name":"GM"},{"title":"bulk density","desc":"bulk density","name":"density","sigma":"0.008","notes":null,"units":"g/cm^3","value":"2.162","ref":"Nature vol. 537, pp515-517 (22 September 2016)"},{"notes":"derived from published value: 952.1532 +/- 0.0001 deg./day","units":"h","value":"9.074170","ref":"Nature vol. 537, pp515-517 (22 September 2016)","title":"rotation period","desc":"body rotation period (synodic)","name":"rot_per","sigma":"0.000001"},{"units":null,"notes":null,"ref":"Nature vol. 537, pp515-517 (22 September 2016)","value":"291.421/66.758","name":"pole","desc":"spin-pole direction in R.A./Dec.","title":"pole direction","sigma":"0.007/0.002"},{"sigma":"0.003","name":"albedo","title":"geometric albedo","desc":"geometric albedo","value":"0.090","ref":"Li et al. 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(1995) or Bus and Binzel (2002)","sigma":null,"title":"SMASSII spectral type","desc":"SMASSII spectral taxonomic classification","name":"spec_B"}],"object":{"orbit_id":"48","shortname":"1 Ceres","prefix":null,"neo":false,"pha":false,"des":"1","fullname":"1 Ceres (A801 AA)","spkid":"20000001","kind":"an","orbit_class":{"name":"Main-belt Asteroid","code":"MBA"}},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"}}
