{"orbit":{"orbit_id":"150","source":"JPL","last_obs":"2025-12-09","two_body":null,"first_obs":"1942-03-23","elements":[{"sigma":"5.2e-10","value":"0.0632","name":"e","units":null,"title":"eccentricity","label":"e"},{"name":"a","units":"au","label":"a","title":"semi-major axis","sigma":"4.1e-10","value":"2.21"},{"sigma":"1.2e-09","value":"2.07","label":"q","title":"perihelion distance","name":"q","units":"au"},{"label":"i","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg","sigma":"4.4e-08","value":"4.25"},{"label":"node","title":"longitude of the ascending node","units":"deg","name":"om","value":"121","sigma":"6.2e-07"},{"name":"w","units":"deg","title":"argument of perihelion","label":"peri","sigma":"7.6e-07","value":"9.55"},{"units":"deg","name":"ma","title":"mean anomaly","label":"M","value":"261","sigma":"8e-07"},{"sigma":"2.7e-06","value":"2461531.429","units":"TDB","name":"tp","title":"time of perihelion passage","label":"tp"},{"label":"period","title":"sidereal orbital period","units":"d","name":"per","value":"1200","sigma":"3.3e-07"},{"name":"n","units":"deg/d","label":"n","title":"mean motion","sigma":"8.3e-11","value":"0.3"},{"sigma":"4.3e-10","value":"2.35","label":"Q","title":"aphelion distance","name":"ad","units":"au"}],"equinox":"J2000","n_del_obs_used":null,"moid":"1.09","n_dop_obs_used":null,"rms":"0.44","soln_date":"2026-08-08 17:30:45","producer":"Otto Matic","epoch":"2461200.5","not_valid_before":null,"condition_code":"0","t_jup":"3.650","sb_used":"SB441-N16","not_valid_after":null,"cov_epoch":"2457104.5","data_arc":"30577","pe_used":"DE441","model_pars":[],"moid_jup":"2.66","comment":null,"n_obs_used":4730},"object":{"kind":"an","prefix":null,"pha":false,"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"shortname":"5535 Annefrank","fullname":"5535 Annefrank (1942 EM)","orbit_id":"150","des":"5535","spkid":"20005535","neo":false},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"phys_par":[{"value":"13.86","notes":null,"units":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","sigma":null,"ref":"E2025-UJ7","title":"absolute magnitude"},{"desc":"effective body diameter","units":"km","name":"diameter","notes":"sphere having a volume equal to that of the fit tri-axial ellipsoid","value":"4.8","title":"diameter","sigma":null,"ref":"T.C. Duxbury et al. (2003) JGR v.109, E02002"},{"title":"extent","ref":"T.C. Duxbury et al. (2003) JGR v.109, E02002","sigma":null,"units":"km","name":"extent","desc":"tri(or bi)-axial body dimensions","notes":"from best fit of Stardust spacecraft images","value":"6.6 x 5.0 x 3.4"},{"notes":"[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.]  REFERENCE LIST:[Schmidt, B.E.; Bauer, J.; Buratti, J.; Russell, C.T. (2007) Lunar & Planetary Sci. XXXVIII, 1859.], [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]","value":"15.12","name":"rot_per","units":"h","desc":"body rotation period (synodic)","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period"},{"ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","sigma":"0.056","title":"geometric albedo","notes":null,"value":"0.311","units":null,"name":"albedo","desc":"geometric albedo"}]}