{"object":{"pha":false,"kind":"an","prefix":null,"fullname":"1 Ceres (A801 AA)","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"shortname":"1 Ceres","neo":false,"orbit_id":"48","spkid":"20000001","des":"1"},"phys_par":[{"notes":"IRAS observations used: 15","name":"H","value":"3.34","units":null,"sigma":null,"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","title":"absolute magnitude","ref":"MPO980521"},{"notes":"Fit","name":"G","units":null,"value":"0.12","title":"magnitude slope","ref":"PDS3 (MPC 17257)","sigma":null,"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law"},{"notes":null,"name":"diameter","value":"939.4","units":"km","sigma":"0.2","desc":"effective body diameter","title":"diameter","ref":"Nature vol. 537, pp515-517 (22 September 2016)"},{"sigma":"0.2 x 0.2 x 0.2","desc":"tri(or bi)-axial body dimensions","ref":"Nature vol. 537, pp515-517 (22 September 2016)","title":"extent","name":"extent","notes":"fit w.r.t. center of mass and in body-fixed frame","value":"964.4 x 964.2 x 891.8","units":"km"},{"notes":null,"name":"GM","units":"km^3/s^2","value":"62.6284","ref":"Nature vol. 537, pp515-517 (22 September 2016)","title":"GM","sigma":"0.0009","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)"},{"sigma":"0.008","desc":"bulk density","title":"bulk density","ref":"Nature vol. 537, pp515-517 (22 September 2016)","notes":null,"name":"density","value":"2.162","units":"g/cm^3"},{"title":"rotation period","ref":"Nature vol. 537, pp515-517 (22 September 2016)","sigma":"0.000001","desc":"body rotation period (synodic)","name":"rot_per","notes":"derived from published value: 952.1532 +/- 0.0001 deg./day","units":"h","value":"9.074170"},{"notes":null,"name":"pole","units":null,"value":"291.421/66.758","ref":"Nature vol. 537, pp515-517 (22 September 2016)","title":"pole direction","sigma":"0.007/0.002","desc":"spin-pole direction in R.A./Dec."},{"units":null,"value":"0.090","notes":"V-band geometric albedo","name":"albedo","ref":"Li et al. 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