{"orbit":{"n_dop_obs_used":null,"producer":"Otto Matic","soln_date":"2026-03-11 21:13:04","sb_used":"SB441-N16","source":"JPL","not_valid_after":null,"condition_code":"0","moid":"1.23","n_obs_used":9766,"moid_jup":"1.85","last_obs":"2025-12-14","epoch":"2461000.5","cov_epoch":"2457870.5","data_arc":"80828","t_jup":"3.043","elements":[{"units":null,"value":"0.231","sigma":"5.8e-09","title":"eccentricity","name":"e","label":"e"},{"value":"2.77","units":"au","name":"a","label":"a","sigma":"1.8e-09","title":"semi-major axis"},{"units":"au","value":"2.13","title":"perihelion distance","sigma":"1.6e-08","label":"q","name":"q"},{"value":"34.9","units":"deg","label":"i","name":"i","title":"inclination; angle with respect to x-y ecliptic plane","sigma":"6.9e-07"},{"units":"deg","value":"173","title":"longitude of the ascending node","sigma":"1.3e-06","name":"om","label":"node"},{"value":"311","units":"deg","label":"peri","name":"w","title":"argument of perihelion","sigma":"2.4e-06"},{"title":"mean anomaly","sigma":"2.5e-06","name":"ma","label":"M","units":"deg","value":"212"},{"label":"tp","name":"tp","title":"time of perihelion passage","sigma":"1.2e-05","value":"2461694.944","units":"TDB"},{"value":"1680","units":"d","name":"per","label":"period","title":"sidereal orbital period","sigma":"1.6e-06"},{"sigma":"2e-10","title":"mean motion","label":"n","name":"n","units":"deg/d","value":"0.214"},{"sigma":"2.2e-09","title":"aphelion distance","label":"Q","name":"ad","units":"au","value":"3.41"}],"first_obs":"1804-08-27","pe_used":"DE441","model_pars":[],"rms":"0.36","two_body":null,"comment":null,"equinox":"J2000","orbit_id":"73","n_del_obs_used":null,"not_valid_before":null},"phys_par":[{"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","sigma":null,"ref":"E2024-SD9","name":"H","notes":"IRAS observations used: 19","units":null,"value":"4.11","title":"absolute magnitude"},{"title":"magnitude slope","notes":"Fit","units":null,"value":"0.11","sigma":null,"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","ref":"PDS3 (MPC 17257)","name":"G"},{"sigma":"6","desc":"effective body diameter","name":"diameter","ref":"Marsset et al., Nature Astronomy 4, 569-576 (2020)","title":"diameter","notes":null,"units":"km","value":"513"},{"notes":null,"units":"km","value":"568x532x448","title":"extent","desc":"tri(or bi)-axial body dimensions","sigma":"12","ref":"Marsset et al., Nature Astronomy 4, 569-576 (2020)","name":"extent"},{"value":"13.63","notes":null,"units":"km^3/s^2","title":"GM","name":"GM","ref":"Vernazza et al., A&A 654, A56 (2021)","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","sigma":"0.18"},{"sigma":"0.08","desc":"bulk density","ref":"Marsset et al., Nature Astronomy 4, 569-576 (2020)","name":"density","units":"g/cm^3","notes":null,"value":"2.89","title":"bulk density"},{"title":"rotation period","units":"h","notes":null,"value":"7.8132214","desc":"body rotation period (synodic)","sigma":"0.000002","name":"rot_per","ref":"Carry et al., Icarus 205, 460-472 (2010)"},{"desc":"spin-pole direction in R.A./Dec.","sigma":"5","ref":"Carry et al., Icarus 205, 460-472 (2010)","name":"pole","units":null,"notes":null,"value":"33/-3","title":"pole direction"},{"name":"albedo","ref":"Vernazza et al., A&A 654, A56 (2021)","desc":"geometric albedo","sigma":null,"value":"0.155","units":null,"notes":null,"title":"geometric albedo"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","name":"BV","desc":"color index B-V magnitude difference","sigma":"0.031","value":"0.635","units":null,"notes":"#obs=32; phase (min.=.19, mean=13.73, max.=25.65) deg.","title":"B-V"},{"title":"U-B","value":"0.284","notes":"#obs=14; phase (min.=7.23, mean=14.81, max.=25.65) deg.","units":null,"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","name":"UB","sigma":"0.018","desc":"color index U-B magnitude difference"},{"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","name":"spec_T","sigma":null,"desc":"Tholen spectral taxonomic classification","title":"Tholen spectral type","value":"B","notes":"used 7 color indices; used ground-based radiometric albedo","units":null},{"sigma":null,"desc":"SMASSII spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","name":"spec_B","units":null,"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","value":"B","title":"SMASSII spectral type"}],"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"des":"2","shortname":"2 Pallas","neo":false,"kind":"an","prefix":null,"pha":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"spkid":"20000002","orbit_id":"73","fullname":"2 Pallas (A802 FA)"}}