{"object":{"shortname":"357 Ninina","kind":"an","neo":false,"fullname":"357 Ninina (A893 CB)","spkid":"20000357","prefix":null,"des":"357","orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"pha":false,"orbit_id":"96"},"orbit":{"source":"JPL","soln_date":"2026-06-05 03:30:01","epoch":"2461200.5","t_jup":"3.149","pe_used":"DE441","moid":"1.95","sb_used":"SB441-N16","n_dop_obs_used":null,"n_del_obs_used":null,"two_body":null,"cov_epoch":"2457584.5","comment":null,"n_obs_used":10708,"orbit_id":"96","equinox":"J2000","producer":"Otto Matic","rms":"0.25","condition_code":"0","first_obs":"1893-02-15","model_pars":[],"not_valid_before":null,"data_arc":"48633","last_obs":"2026-04-12","elements":[{"units":null,"label":"e","title":"eccentricity","name":"e","sigma":"2e-09","value":"0.0784"},{"units":"au","label":"a","title":"semi-major axis","name":"a","sigma":"2.7e-09","value":"3.15"},{"name":"q","value":"2.9","sigma":"8.2e-09","title":"perihelion distance","label":"q","units":"au"},{"title":"inclination; angle with respect to x-y ecliptic plane","label":"i","units":"deg","value":"15.1","sigma":"1.1e-07","name":"i"},{"sigma":"2.7e-07","value":"138","name":"om","units":"deg","title":"longitude of the ascending node","label":"node"},{"label":"peri","title":"argument of perihelion","units":"deg","sigma":"8.6e-07","value":"257","name":"w"},{"units":"deg","title":"mean anomaly","label":"M","value":"56.3","sigma":"1.1e-06","name":"ma"},{"name":"tp","value":"2460880.857","sigma":"6.1e-06","units":"TDB","label":"tp","title":"time of perihelion passage"},{"units":"d","title":"sidereal orbital period","label":"period","name":"per","sigma":"2.6e-06","value":"2040"},{"name":"n","sigma":"2.3e-10","value":"0.176","title":"mean motion","label":"n","units":"deg/d"},{"sigma":"2.9e-09","value":"3.4","name":"ad","title":"aphelion distance","label":"Q","units":"au"}],"moid_jup":"1.99","not_valid_after":null},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"name":"H","ref":"MPO980526","value":"8.97","sigma":null,"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","title":"absolute magnitude","notes":"IRAS observations used: 14","units":null},{"sigma":"0.857","value":"124.107","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","name":"diameter","title":"diameter","units":"km","notes":null,"desc":"effective body diameter"},{"notes":"REFERENCE LIST:[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Oey, J. (2014) Minor Planet Bull. 41, 276-281.], [Colazo, M.;; Fornari,, C.; Wilberger, A.; Morales, M.; et al. (2021) Minor Planet Bull. 48, 363-365.], [Pilcher, F.; Fanco, L.; Marchini, A.; Oey, J. (2021) Minor Planet Bull. 48, 233-235.], [Pilcher, F.; Franco, L.; Marchini, A.; Papini, R.; et al. (2023) Minor Planet Bull. 50, 255-256.]","units":"h","title":"rotation period","desc":"body rotation period (synodic)","value":"35.983","sigma":null,"name":"rot_per","ref":"LCDB (Rev. 2023-October); Warner et al., 2009"},{"name":"albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","value":"0.037","sigma":"0.007","desc":"geometric albedo","title":"geometric albedo","notes":null,"units":null},{"title":"B-V","notes":"#obs=3; phase (min.=6.40, mean=8.05, max.=9.45) deg.","units":null,"desc":"color index B-V magnitude difference","value":"0.715","sigma":"0.038","name":"BV","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2"},{"value":"0.350","sigma":"0.038","name":"UB","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=3; phase (min.=6.40, mean=8.05, max.=9.45) deg.","units":null,"title":"U-B","desc":"color index U-B magnitude difference"},{"desc":"Tholen spectral taxonomic classification","notes":"used 2 color indices","units":null,"title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","name":"spec_T","value":"CX","sigma":null}]}