{"object":{"pha":false,"prefix":null,"kind":"an","orbit_id":"92","shortname":"16 Psyche","spkid":"20000016","neo":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"fullname":"16 Psyche (A852 FA)","des":"16"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"orbit":{"model_pars":[],"n_del_obs_used":null,"orbit_id":"92","producer":"Ryan Park","epoch":"2461200.5","condition_code":"0","not_valid_after":null,"first_obs":"1984-06-22","data_arc":"14782","n_obs_used":7401,"last_obs":"2024-12-11","comment":null,"moid_jup":"2.14","elements":[{"units":null,"label":"e","value":"0.135","sigma":"3e-09","title":"eccentricity","name":"e"},{"units":"au","label":"a","sigma":"2.9e-09","value":"2.93","title":"semi-major axis","name":"a"},{"units":"au","label":"q","value":"2.53","sigma":"1e-08","title":"perihelion distance","name":"q"},{"sigma":"3e-07","value":"3.1","name":"i","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","label":"i"},{"units":"deg","label":"node","value":"150","sigma":"6.1e-06","name":"om","title":"longitude of the ascending node"},{"sigma":"6.2e-06","value":"230","title":"argument of perihelion","name":"w","units":"deg","label":"peri"},{"label":"M","units":"deg","name":"ma","title":"mean anomaly","sigma":"1.8e-06","value":"79.8"},{"label":"tp","units":"TDB","title":"time of perihelion passage","name":"tp","sigma":"8.8e-06","value":"2460795.475"},{"title":"sidereal orbital period","name":"per","sigma":"2.7e-06","value":"1830","label":"period","units":"d"},{"title":"mean motion","name":"n","sigma":"2.9e-10","value":"0.197","label":"n","units":"deg/d"},{"title":"aphelion distance","name":"ad","sigma":"3.3e-09","value":"3.32","label":"Q","units":"au"}],"cov_epoch":"2457856.5","n_dop_obs_used":null,"source":"JPL","sb_used":"SB441-N16","equinox":"J2000","not_valid_before":null,"soln_date":"2025-02-06 14:15:44","pe_used":"DE441","rms":"0.18","moid":"1.53","two_body":null,"t_jup":"3.262"},"phys_par":[{"notes":"IRAS observations used: 32","units":null,"title":"absolute magnitude","name":"H","ref":"E2024-XU9","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","value":"6.20","sigma":null},{"notes":"Fit","units":null,"title":"magnitude slope","name":"G","ref":"PDS3 (MPC 17257)","desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","sigma":null,"value":"0.20"},{"units":"km","notes":null,"value":"222","sigma":"-1/+4","desc":"effective body diameter","ref":"Shepard et al. (2021), The Planetary Science Journal 2, 125","title":"diameter","name":"diameter"},{"value":"278 x 238 x 171","sigma":"6 x 5 x 3","desc":"tri(or bi)-axial body dimensions","ref":"Shepard et al. (2021), The Planetary Science Journal 2, 125","title":"extent","name":"extent","units":"km","notes":null},{"ref":"Farnocchia et al. (2024), AJ 168, 21","name":"GM","title":"GM","sigma":"0.017","value":"1.601","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","notes":null,"units":"km^3/s^2"},{"ref":"Farnocchia et al. (2024), AJ 168, 21","title":"bulk density","name":"density","sigma":"0.145","value":"4.172","desc":"bulk density","notes":null,"units":"g/cm^3"},{"value":"4.196","sigma":null,"desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","name":"rot_per","units":"h","notes":"REFERENCE LIST:[Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. 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(2013) Icarus 226, 1045-1057.], [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.], [Warner, B.D. (2016) Minor Planet Bull. 43, 137-140.], [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.], [Drummond, J.D.; Merline, W.J.; Carry, B.; Conrad, A.; et al. (2018) Icarus 305, 174-185.], [Viikinkoski, M.; Vernazza, P.; Hanus, J.; Le Coroller, H.; et al. (2018) Astron. Astrophys. 619, L3.], [Ferrais, M.; Vernazz, P.; Jorda, L.; Rambaux, N.; et al. (2020) Astorn. Astrophys. 638, L15.], [Shepard, M.K.; de Kleer, K.; Cambioni, S.; Tayler, P.A.; et al. (2021) Plan. Sci. J. 2, id. 125.], [Vernazza, P.; Ferrais, M.; Jorda, L.; Hanus, J.; et al. (2021) Astron. Astrophys 654, id. A56.], [Ferrais, M.; Vernazza, P.; Jorda, L.; Jehin, E.; et al. (2022) Minor Planet Bull. 49, 307-313.]"},{"notes":"IRAS observations used: 32","units":null,"name":"albedo","title":"geometric albedo","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","desc":"geometric albedo","sigma":"0.004","value":"0.1203"},{"notes":"#obs=7; phase (min.=.95, mean=9.89, max.=21.42) deg.","units":null,"name":"BV","title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","desc":"color index B-V magnitude difference","sigma":"0.023","value":"0.729"},{"desc":"color index U-B magnitude difference","sigma":"0.058","value":"0.299","name":"UB","title":"U-B","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","units":null,"notes":"#obs=71; phase (min.=.95, mean=9.30, max.=21.42) deg."},{"units":null,"notes":"used 7 color indices; used ground-based radiometric albedo","desc":"Tholen spectral taxonomic classification","sigma":null,"value":"M","name":"spec_T","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0"},{"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","units":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","name":"spec_B","sigma":null,"value":"X","desc":"SMASSII spectral taxonomic classification"}]}