{"orbit":{"condition_code":"0","elements":[{"value":"0.0461","name":"e","title":"eccentricity","label":"e","sigma":"1e-09","units":null},{"label":"a","sigma":"1.8e-09","units":"au","value":"2.86","title":"semi-major axis","name":"a"},{"name":"q","title":"perihelion distance","value":"2.73","label":"q","units":"au","sigma":"4.1e-09"},{"value":"1.13","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","sigma":"6.2e-08","units":"deg","label":"i"},{"label":"node","sigma":"4e-06","units":"deg","value":"324","name":"om","title":"longitude of the ascending node"},{"label":"peri","sigma":"4.4e-06","units":"deg","value":"113","title":"argument of perihelion","name":"w"},{"label":"M","units":"deg","sigma":"2.1e-06","title":"mean anomaly","name":"ma","value":"49.6"},{"label":"tp","units":"TDB","sigma":"9.9e-06","name":"tp","title":"time of perihelion passage","value":"2460956.435"},{"value":"1770","title":"sidereal orbital period","name":"per","label":"period","sigma":"1.7e-06","units":"d"},{"name":"n","title":"mean motion","value":"0.203","units":"deg/d","sigma":"1.9e-10","label":"n"},{"value":"3","title":"aphelion distance","name":"ad","sigma":"1.9e-09","units":"au","label":"Q"}],"n_del_obs_used":null,"moid_jup":"2.13","comment":null,"orbit_id":"191","producer":"Otto Matic","soln_date":"2026-06-05 03:20:34","not_valid_before":null,"n_dop_obs_used":null,"model_pars":[],"data_arc":"51578","cov_epoch":"2457351.5","last_obs":"2026-04-07","t_jup":"3.299","n_obs_used":12966,"equinox":"J2000","source":"JPL","moid":"1.75","two_body":null,"pe_used":"DE441","epoch":"2461200.5","sb_used":"SB441-N16","first_obs":"1885-01-18","not_valid_after":null,"rms":"0.27"},"phys_par":[{"units":null,"sigma":null,"title":"absolute magnitude","notes":"IRAS observations used: 13","name":"H","value":"10.06","ref":"MPO980524","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"name":"diameter","value":"32","ref":"Belton et al. (1995)","desc":"effective body diameter","notes":"Yeomans E-mail 2001-Apr-04","title":"diameter","units":"km","sigma":null},{"units":"km","sigma":null,"title":"extent","notes":"fit ellipsoid","name":"extent","value":"59.8x25.4x18.6","ref":"Thomas et al. (1996) Icarus v.120, pp.20-32","desc":"tri(or bi)-axial body dimensions"},{"title":"GM","sigma":"0.00035","units":"km^3/s^2","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","ref":"Belton et al. (1996) Icarus v.120, pp.185-199","value":"0.00275","name":"GM","notes":"0.0024 < GM < 0.0031"},{"notes":null,"ref":"Belton et al. (1996) Icarus v.120, pp.185-199","value":"2.6","name":"density","desc":"bulk density","sigma":"0.5","units":"g/cm^3","title":"bulk density"},{"title":"rotation period","units":"h","sigma":null,"name":"rot_per","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","value":"4.634","desc":"body rotation period (synodic)","notes":"REFERENCE LIST:[Binzel, R.P. (1987) Icarus 72, 135-208.], [Binzel, R.P.; Slivan, S.M.; Magnusson, P.; Wisniewski, W.Z.; et al. (1993) Icarus 105, 310-325.], [Davies, M.E.; Colvin, T.R.; Belton, M.J.S.; Veverka, J.; Thomas, P.C. (1996) Icarus 120, 33-37.], [Cieza, L.A.; Ciliberti, L.N.; Iserte, J.A. (1999) IAPPP Comm. #74, 12-23.], [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.], [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Proyecto ECLA (Silvia Alonso Perez) (2011) http://www.geocities.com/proyectoecla/], [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.], [Polakis, T. (2020) Minor Planet Bull. 47, 13-17.], [Behrend, R. (2021) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Wilkin, F.P.; AlMassri, F.P.; Bowles, P.; Pargiello, M.; et al. (2022) Minor Planet Bull. 49, 267-268.]"},{"units":null,"sigma":"0.032","title":"geometric albedo","notes":null,"name":"albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","value":"0.262","desc":"geometric albedo"},{"desc":"color index B-V magnitude difference","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","value":"0.802","name":"BV","notes":"#obs=4; phase (min.=.81, mean=6.76, max.=14.56) deg.","title":"B-V","sigma":"0.009","units":null},{"sigma":"0.037","units":null,"title":"U-B","notes":"#obs=3; phase (min.=.81, mean=5.40, max.=14.56) deg.","desc":"color index U-B magnitude difference","value":"0.416","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","name":"UB"},{"title":"Tholen spectral type","units":null,"sigma":null,"desc":"Tholen spectral taxonomic classification","name":"spec_T","value":"S","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","notes":"used 7 color indices; used ground-based radiometric albedo"},{"name":"spec_B","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"S","desc":"SMASSII spectral taxonomic classification","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","title":"SMASSII spectral type","units":null,"sigma":null}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"object":{"neo":false,"spkid":"20000243","des":"243","shortname":"243 Ida","orbit_id":"191","kind":"an","pha":false,"prefix":null,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"fullname":"243 Ida (A884 SB)"}}