{"phys_par":[{"notes":null,"value":"8.72","name":"H","ref":"MPO964266","sigma":null,"units":null,"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","title":"absolute magnitude"},{"notes":"IRAS observations used: 11","value":"132.93","name":"diameter","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","sigma":"5.1","units":"km","desc":"effective body diameter","title":"diameter"},{"notes":"REFERENCE LIST:[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Buchheim, R.K. (2005) Minor Planet Bull. 32, 35-36.], [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]","name":"rot_per","value":"7.8528","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","desc":"body rotation period (synodic)","sigma":null,"units":"h","title":"rotation period"},{"sigma":"0.004","units":null,"title":"geometric albedo","desc":"geometric albedo","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","value":"0.0492","name":"albedo","notes":"IRAS observations used: 11"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","desc":"color index B-V magnitude difference","sigma":"0.023","units":null,"title":"B-V","notes":"#obs=3; phase (min.=1.00, mean=2.06, max.=3.43) deg.","name":"BV","value":"0.678"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","sigma":"0.028","units":null,"desc":"color index U-B magnitude difference","title":"U-B","notes":"#obs=2; phase (min.=1.00, mean=2.22, max.=3.43) deg.","value":"0.293","name":"UB"},{"value":"C","name":"spec_T","notes":"used 7 color indices; used ground-based radiometric albedo","sigma":null,"units":null,"title":"Tholen spectral type","desc":"Tholen spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0"},{"title":"SMASSII spectral type","sigma":null,"units":null,"desc":"SMASSII spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"C","name":"spec_B","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)"}],"object":{"spkid":"20000147","shortname":"147 Protogeneia","orbit_id":"95","fullname":"147 Protogeneia (A875 NA)","neo":false,"prefix":null,"des":"147","pha":false,"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"kind":"an"},"orbit":{"epoch":"2461200.5","last_obs":"2025-12-09","not_valid_before":null,"sb_used":"SB441-N16","soln_date":"2026-06-05 03:12:29","not_valid_after":null,"moid":"2.06","data_arc":"54862","n_obs_used":6793,"t_jup":"3.210","equinox":"J2000","first_obs":"1875-09-25","elements":[{"label":"e","value":"0.0218","name":"e","sigma":"1.7e-09","title":"eccentricity","units":null},{"label":"a","name":"a","value":"3.14","title":"semi-major axis","sigma":"3.3e-09","units":"au"},{"sigma":"7.9e-09","units":"au","title":"perihelion distance","label":"q","value":"3.07","name":"q"},{"title":"inclination; angle with respect to x-y ecliptic plane","sigma":"1.3e-07","units":"deg","label":"i","name":"i","value":"1.93"},{"label":"node","name":"om","value":"248","sigma":"4e-06","title":"longitude of the ascending node","units":"deg"},{"value":"103","name":"w","label":"peri","title":"argument of perihelion","sigma":"6.5e-06","units":"deg"},{"title":"mean anomaly","sigma":"5.3e-06","units":"deg","name":"ma","value":"8.77","label":"M"},{"units":"TDB","sigma":"3e-05","title":"time of perihelion passage","name":"tp","value":"2461151.046","label":"tp"},{"sigma":"3.2e-06","title":"sidereal orbital period","units":"d","name":"per","value":"2030","label":"period"},{"title":"mean motion","sigma":"2.8e-10","units":"deg/d","name":"n","value":"0.177","label":"n"},{"sigma":"3.3e-09","units":"au","title":"aphelion distance","label":"Q","name":"ad","value":"3.21"}],"orbit_id":"95","pe_used":"DE441","model_pars":[],"two_body":null,"moid_jup":"1.89","rms":"0.34","comment":null,"n_dop_obs_used":null,"condition_code":"0","producer":"Otto Matic","source":"JPL","n_del_obs_used":null,"cov_epoch":"2457509.5"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"}}