{"orbit":{"orbit_id":"153","pe_used":"DE441","moid":"0.986","source":"JPL","producer":"Otto Matic","two_body":null,"n_obs_used":6796,"first_obs":"1865-06-13","last_obs":"2026-04-05","not_valid_after":null,"rms":"0.34","sb_used":"SB441-N16","model_pars":[],"cov_epoch":"2457568.5","comment":null,"moid_jup":"2.08","t_jup":"3.362","not_valid_before":null,"condition_code":"0","n_del_obs_used":null,"elements":[{"label":"e","units":null,"sigma":"2.2e-09","title":"eccentricity","name":"e","value":"0.237"},{"label":"a","units":"au","sigma":"1.8e-09","name":"a","value":"2.6","title":"semi-major axis"},{"units":"au","label":"q","title":"perihelion distance","name":"q","value":"1.98","sigma":"5.8e-09"},{"label":"i","units":"deg","sigma":"9.7e-08","value":"8.08","name":"i","title":"inclination; angle with respect to x-y ecliptic plane"},{"label":"node","units":"deg","sigma":"8.9e-07","title":"longitude of the ascending node","name":"om","value":"193"},{"label":"peri","units":"deg","sigma":"9.8e-07","value":"105","name":"w","title":"argument of perihelion"},{"label":"M","units":"deg","sigma":"1e-06","title":"mean anomaly","value":"139","name":"ma"},{"name":"tp","value":"2460609.677","title":"time of perihelion passage","sigma":"3.7e-06","units":"TDB","label":"tp"},{"title":"sidereal orbital period","value":"1530","name":"per","sigma":"1.6e-06","units":"d","label":"period"},{"label":"n","units":"deg/d","sigma":"2.4e-10","name":"n","value":"0.235","title":"mean motion"},{"units":"au","label":"Q","title":"aphelion distance","name":"ad","value":"3.21","sigma":"2.2e-09"}],"soln_date":"2026-06-05 03:05:28","n_dop_obs_used":null,"data_arc":"58735","epoch":"2461200.5","equinox":"J2000"},"phys_par":[{"value":"8.51","title":"absolute magnitude","ref":"E2026-EA1","units":null,"notes":"IRAS observations used: 26","sigma":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)"},{"notes":null,"sigma":"0.947","name":"diameter","desc":"effective body diameter","value":"121.333","title":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","units":"km"},{"units":"h","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","value":"18.147","desc":"body rotation period (synodic)","sigma":null,"notes":"REFERENCE LIST:[Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.], [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Warner, B.D. (2007) Minor Planet Bull. 34, 104-107.], [Pilcher, F.; Jardine, D. (2009) Minor Planet Bull. 36, 52-54.], [Warner, B.D. (2011) http://www.minorplanetobserver.com/PDO/PDOLightcurves.htm], [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.], [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.], [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2020) Ap. J. Supl. Ser. 247, id.26.]","name":"rot_per"},{"desc":"geometric albedo","name":"albedo","sigma":"0.011","notes":null,"units":null,"title":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","value":"0.057"},{"desc":"color index B-V magnitude difference","sigma":"0.033","notes":"#obs=4; phase (min.=4.79, mean=12.85, max.=28.04) deg.","name":"BV","units":null,"value":"0.697","title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2"},{"units":null,"value":"0.312","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"U-B","desc":"color index U-B magnitude difference","name":"UB","notes":"#obs=4; phase (min.=4.79, mean=12.85, max.=28.04) deg.","sigma":"0.039"},{"name":"spec_T","sigma":null,"notes":"used 7 color indices; used ground-based radiometric albedo","desc":"Tholen spectral taxonomic classification","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"P","units":null},{"desc":"SMASSII spectral taxonomic classification","sigma":null,"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","name":"spec_B","units":null,"title":"SMASSII spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"Xk"}],"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"neo":false,"des":"56","prefix":null,"spkid":"20000056","shortname":"56 Melete","pha":false,"orbit_id":"153","kind":"an","fullname":"56 Melete (A857 RB)","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"}}}
