{"orbit":{"n_del_obs_used":null,"elements":[{"title":"eccentricity","name":"e","value":"0.237","sigma":"2e-09","units":null,"label":"e"},{"units":"au","label":"a","name":"a","value":"2.62","title":"semi-major axis","sigma":"1.9e-09"},{"units":"au","label":"q","title":"perihelion distance","value":"2","name":"q","sigma":"5.6e-09"},{"name":"i","value":"18.5","title":"inclination; angle with respect to x-y ecliptic plane","sigma":"1.9e-07","units":"deg","label":"i"},{"label":"node","units":"deg","sigma":"8e-07","title":"longitude of the ascending node","name":"om","value":"159"},{"units":"deg","label":"peri","title":"argument of perihelion","name":"w","value":"164","sigma":"9.4e-07"},{"label":"M","units":"deg","sigma":"1.3e-06","title":"mean anomaly","name":"ma","value":"160"},{"label":"tp","units":"TDB","sigma":"5.1e-06","value":"2460510.735","name":"tp","title":"time of perihelion passage"},{"title":"sidereal orbital period","name":"per","value":"1550","sigma":"1.7e-06","units":"d","label":"period"},{"units":"deg/d","label":"n","value":"0.233","name":"n","title":"mean motion","sigma":"2.6e-10"},{"title":"aphelion distance","value":"3.24","name":"ad","sigma":"2.4e-09","units":"au","label":"Q"}],"condition_code":"0","soln_date":"2026-06-05 03:16:08","moid_jup":"2.16","comment":null,"t_jup":"3.294","not_valid_before":null,"equinox":"J2000","epoch":"2461200.5","data_arc":"53713","n_dop_obs_used":null,"source":"JPL","producer":"Otto Matic","n_obs_used":6777,"first_obs":"1879-03-22","two_body":null,"orbit_id":"172","moid":"0.99","pe_used":"DE441","model_pars":[],"rms":"0.35","sb_used":"SB441-N16","cov_epoch":"2457757.5","last_obs":"2026-04-13","not_valid_after":null},"phys_par":[{"units":null,"value":"7.83","ref":"E2026E71","title":"absolute magnitude","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","name":"H","sigma":null,"notes":"IRAS observations used: 9"},{"name":"diameter","notes":null,"sigma":"1.252","desc":"effective body diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"diameter","value":"161.667","units":"km"},{"sigma":null,"notes":"REFERENCE LIST:[Scaltriti, F.; Zappala, V. (1979) Icarus 39, 124-130.], [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.], [Pilcher, F. (2011) Minor Planet Bull. 38, 183-185.], [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Pilcher, F. (2019) Minor Planet Bull. 46, 445-448.]","name":"rot_per","desc":"body rotation period (synodic)","value":"15.679","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","units":"h"},{"desc":"geometric albedo","notes":null,"sigma":"0.009","name":"albedo","units":null,"ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo","value":"0.057"},{"units":null,"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"B-V","value":"0.724","desc":"color index B-V magnitude difference","name":"BV","sigma":"0.018","notes":"#obs=4; phase (min.=10.24, mean=17.56, max.=25.12) deg."},{"units":null,"value":"0.341","title":"U-B","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","desc":"color index U-B magnitude difference","sigma":"0.011","notes":"#obs=3; phase (min.=10.24, mean=15.04, max.=17.62) deg.","name":"UB"},{"desc":"Tholen spectral taxonomic classification","sigma":null,"notes":"used 7 color indices; used ground-based radiometric albedo","name":"spec_T","units":null,"value":"C","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0"},{"desc":"SMASSII spectral taxonomic classification","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","sigma":null,"name":"spec_B","units":null,"value":"C","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type"}],"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"fullname":"194 Prokne (A879 FA)","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"kind":"an","orbit_id":"172","pha":false,"shortname":"194 Prokne","spkid":"20000194","prefix":null,"des":"194","neo":false}}