{"orbit":{"n_del_obs_used":2977,"first_obs":"1950-09-23","last_obs":"2021-03-17","not_valid_after":null,"not_valid_before":null,"t_jup":"3.535","orbit_id":"36","data_arc":"25743","moid_jup":"2.46454","epoch":"2461200.5","soln_date":"2021-04-13 11:15:57","pe_used":"DE441","condition_code":"0","n_obs_used":9451,"elements":[{"value":".09020374382834395","sigma":"2.2909E-10","label":"e","units":null,"name":"e","title":"eccentricity"},{"label":"a","sigma":"1.5328E-9","value":"2.361365965127599","name":"a","title":"semi-major axis","units":"au"},{"units":"au","name":"q","title":"perihelion distance","value":"2.148361914524259","label":"q","sigma":"1.9335E-9"},{"title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg","sigma":"2.1704E-7","label":"i","value":"7.143925545058711"},{"title":"longitude of the ascending node","name":"om","units":"deg","sigma":"3.8827E-7","label":"node","value":"103.701293265032"},{"units":"deg","name":"w","title":"argument of perihelion","value":"151.4686478221564","label":"peri","sigma":"1.8814E-7"},{"sigma":"1.9021E-6","label":"M","value":"81.19015607686903","title":"mean anomaly","name":"ma","units":"deg"},{"label":"tp","sigma":"6.7119E-6","value":"2460901.587379842988","name":"tp","title":"time of perihelion passage","units":"TDB"},{"sigma":"1.2905E-6","label":"period","value":"1325.389042911101","name":"per","title":"sidereal orbital period","units":"d"},{"value":".2716183613599909","label":"n","sigma":"2.6447E-10","units":"deg/d","title":"mean motion","name":"n"},{"label":"Q","sigma":"1.6711E-9","value":"2.574370015730939","title":"aphelion distance","name":"ad","units":"au"}],"moid":"1.13603","model_pars":[],"producer":"Davide Farnocchia","equinox":"J2000","source":"JPL","comment":null,"two_body":null,"sb_used":"SB441-N16","rms":".40095","n_dop_obs_used":0,"cov_epoch":"2458849.5"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"value":"3.25","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","sigma":null,"ref":"E2024D82","notes":"IRAS observations used: 2","units":null,"title":"absolute magnitude","name":"H"},{"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","value":"0.32","notes":"Fit","ref":"PDS3 (MPC 17257)","sigma":null,"units":null,"title":"magnitude slope","name":"G"},{"name":"diameter","title":"diameter","units":"km","sigma":"0.1","notes":null,"ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","value":"522.77","desc":"effective body diameter"},{"value":"569.24 x 554.48 x 452.66","desc":"tri(or bi)-axial body dimensions","sigma":"0.1 x 0.1 x 0.1","ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","notes":null,"units":"km","name":"extent","title":"extent"},{"value":"17.2882844","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","sigma":"0.0000030","ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","notes":null,"units":"km^3/s^2","name":"GM","title":"GM"},{"value":"3.460","desc":"bulk density","sigma":"0.005","notes":null,"ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","units":"g/cm^3","title":"bulk density","name":"density"},{"title":"rotation period","name":"rot_per","units":"h","sigma":"0.0000000004","ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","notes":"Rotation rate (deg/day): 1617.33312922 +/- 0.00000013","value":"5.3421276322","desc":"body rotation period (synodic)"},{"notes":"values in degrees","ref":"Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7","sigma":"0.00031/0.000068","desc":"spin-pole direction in R.A./Dec.","value":"309.06110/42.232386","name":"pole","title":"pole direction","units":null},{"desc":"geometric albedo","value":"0.4228","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","notes":"IRAS observations used: 2","sigma":"0.053","units":null,"title":"geometric albedo","name":"albedo"},{"value":"0.782","desc":"color index B-V magnitude difference","sigma":"0.020","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=23; phase (min.=1.73, mean=14.92, max.=24.69) deg.","units":null,"name":"BV","title":"B-V"},{"title":"U-B","name":"UB","units":null,"sigma":"0.030","notes":"#obs=23; phase (min.=1.73, mean=15.34, max.=24.69) deg.","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","value":"0.492","desc":"color index U-B magnitude difference"},{"desc":"Tholen spectral taxonomic classification","value":"V","notes":"used 7 color indices; used ground-based radiometric albedo","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"units":null,"title":"Tholen spectral type","name":"spec_T"},{"units":null,"title":"SMASSII spectral type","name":"spec_B","desc":"SMASSII spectral taxonomic classification","value":"V","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null}],"object":{"kind":"an","des":"4","spkid":"20000004","pha":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"orbit_id":"36","fullname":"4 Vesta (A807 FA)","prefix":null,"neo":false,"shortname":"4 Vesta"}}