{"phys_par":[{"notes":"IRAS observations used: 11","value":"8.33","units":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","ref":"E2026-EA1","sigma":null,"title":"absolute magnitude"},{"desc":"effective body diameter","units":"km","name":"diameter","notes":null,"value":"128.678","title":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","sigma":"0.533"},{"notes":"REFERENCE LIST:[Pilcher, F.; Jardine, D. (2009) Minor Planet Bull. 36, 52-54.], [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]","value":"25.676","units":"h","name":"rot_per","desc":"body rotation period (synodic)","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period"},{"value":"0.065","notes":null,"name":"albedo","units":null,"desc":"geometric albedo","sigma":"0.005","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo"},{"notes":"#obs=4; phase (min.=7.19, mean=11.61, max.=17.67) deg.","value":"0.689","units":null,"name":"BV","desc":"color index B-V magnitude difference","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","sigma":"0.031","title":"B-V"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","sigma":"0.041","title":"U-B","notes":"#obs=5; phase (min.=7.19, mean=11.08, max.=17.67) deg.","value":"0.326","desc":"color index U-B magnitude difference","units":null,"name":"UB"},{"notes":"used 7 color indices; used ground-based radiometric albedo","value":"C","name":"spec_T","units":null,"desc":"Tholen spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"title":"Tholen spectral type"}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"object":{"kind":"an","prefix":null,"pha":false,"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"shortname":"137 Meliboea","fullname":"137 Meliboea (A874 HA)","orbit_id":"147","spkid":"20000137","des":"137","neo":false},"orbit":{"condition_code":"0","t_jup":"3.138","sb_used":"SB441-N16","not_valid_after":null,"cov_epoch":"2458409.5","data_arc":"53274","pe_used":"DE441","model_pars":[],"moid_jup":"1.81","comment":null,"n_obs_used":11022,"orbit_id":"147","source":"JPL","last_obs":"2026-04-12","two_body":null,"first_obs":"1880-06-02","elements":[{"title":"eccentricity","label":"e","name":"e","units":null,"sigma":"1.7e-09","value":"0.21"},{"units":"au","name":"a","label":"a","title":"semi-major axis","value":"3.13","sigma":"2.6e-09"},{"value":"2.47","sigma":"5.3e-09","label":"q","title":"perihelion distance","units":"au","name":"q"},{"label":"i","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg","sigma":"1.1e-07","value":"13.4"},{"sigma":"6.2e-07","value":"202","name":"om","units":"deg","title":"longitude of the ascending node","label":"node"},{"name":"w","units":"deg","label":"peri","title":"argument of perihelion","value":"108","sigma":"7.9e-07"},{"title":"mean anomaly","label":"M","name":"ma","units":"deg","value":"142","sigma":"6e-07"},{"units":"TDB","name":"tp","label":"tp","title":"time of perihelion passage","value":"2460401.992","sigma":"2.7e-06"},{"title":"sidereal orbital period","label":"period","units":"d","name":"per","value":"2020","sigma":"2.5e-06"},{"value":"0.178","sigma":"2.2e-10","name":"n","units":"deg/d","title":"mean motion","label":"n"},{"value":"3.79","sigma":"3.2e-09","units":"au","name":"ad","title":"aphelion distance","label":"Q"}],"equinox":"J2000","n_del_obs_used":null,"moid":"1.5","n_dop_obs_used":null,"rms":"0.25","soln_date":"2026-06-05 03:11:50","producer":"Otto Matic","epoch":"2461200.5","not_valid_before":null}}
