{"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"neo":false,"kind":"an","spkid":"20000185","orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"orbit_id":"129","shortname":"185 Eunike","des":"185","fullname":"185 Eunike (A878 EA)","prefix":null,"pha":false},"phys_par":[{"notes":"IRAS observations used: 23","value":"7.62","ref":"MPO964267","title":"absolute magnitude","units":null,"sigma":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"name":"diameter","desc":"effective body diameter","title":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","sigma":"2.016","units":"km","notes":null,"value":"160.464"},{"desc":"body rotation period (synodic)","name":"rot_per","units":"h","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","value":"21.797","notes":"REFERENCE LIST:[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Pilcher, F.; Ruthroff, J.C. (2012) Minor Planet Bull. 39, 13.], [Hills, K. (2013) Minor Planet Bull. 40, 89-90.], [Pilcher, F.; Behrend, R.; Bernasconi, L.; Franco, L.; Hills, K.; et al. (2014) Minor Planet Bull. 41, 244-250.], [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]"},{"name":"albedo","desc":"geometric albedo","notes":null,"value":"0.062","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo","sigma":"0.005","units":null},{"title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","units":null,"sigma":"0.040","notes":"#obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.","value":"0.668","name":"BV","desc":"color index B-V magnitude difference"},{"units":null,"sigma":"0.031","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B","value":"0.331","notes":"#obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.","desc":"color index U-B magnitude difference","name":"UB"},{"desc":"Tholen spectral taxonomic classification","name":"spec_T","units":null,"sigma":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"Tholen spectral type","value":"C","notes":"used 7 color indices"},{"value":"C","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","units":null,"sigma":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","desc":"SMASSII spectral taxonomic classification","name":"spec_B"}],"orbit":{"sb_used":"SB441-N16","condition_code":"0","n_del_obs_used":null,"t_jup":"3.223","source":"JPL","n_obs_used":5881,"first_obs":"1880-09-11","equinox":"J2000","last_obs":"2026-01-31","rms":"0.37","moid_jup":"2.41","not_valid_after":null,"elements":[{"name":"e","label":"e","title":"eccentricity","units":null,"sigma":"2.4e-09","value":"0.127"},{"label":"a","name":"a","title":"semi-major axis","sigma":"2.8e-09","units":"au","value":"2.74"},{"units":"au","sigma":"5.8e-09","title":"perihelion distance","value":"2.39","label":"q","name":"q"},{"units":"deg","sigma":"1.7e-07","title":"inclination; angle with respect to x-y ecliptic plane","value":"23.3","name":"i","label":"i"},{"name":"om","label":"node","units":"deg","sigma":"5.6e-07","title":"longitude of the ascending node","value":"154"},{"name":"w","label":"peri","value":"224","sigma":"1.1e-06","units":"deg","title":"argument of perihelion"},{"label":"M","name":"ma","sigma":"1.6e-06","units":"deg","title":"mean anomaly","value":"30.4"},{"value":"2461060.633","units":"TDB","sigma":"7e-06","title":"time of perihelion passage","label":"tp","name":"tp"},{"value":"1650","sigma":"2.5e-06","units":"d","title":"sidereal orbital period","label":"period","name":"per"},{"value":"0.218","sigma":"3.3e-10","units":"deg/d","title":"mean motion","label":"n","name":"n"},{"value":"3.09","units":"au","sigma":"3.1e-09","title":"aphelion distance","name":"ad","label":"Q"}],"soln_date":"2026-06-05 03:15:40","epoch":"2461200.5","model_pars":[],"moid":"1.42","not_valid_before":null,"data_arc":"53102","producer":"Otto Matic","two_body":null,"n_dop_obs_used":null,"comment":null,"cov_epoch":"2457762.5","pe_used":"DE441","orbit_id":"129"}}
