{"orbit":{"producer":"Otto Matic","comment":null,"n_del_obs_used":null,"soln_date":"2026-03-11 21:13:05","not_valid_after":null,"two_body":null,"condition_code":"0","cov_epoch":"2458018.5","rms":"0.41","elements":[{"title":"eccentricity","value":"0.122","name":"e","sigma":"3.1e-09","units":null,"label":"e"},{"name":"a","sigma":"1.1e-09","units":"au","label":"a","value":"2.39","title":"semi-major axis"},{"title":"perihelion distance","value":"2.09","units":"au","label":"q","sigma":"7.5e-09","name":"q"},{"units":"deg","label":"i","sigma":"3.1e-07","name":"i","value":"5.58","title":"inclination; angle with respect to x-y ecliptic plane"},{"value":"68.9","title":"longitude of the ascending node","label":"node","units":"deg","sigma":"3.4e-06","name":"om"},{"value":"5.93","title":"argument of perihelion","sigma":"3.7e-06","name":"w","units":"deg","label":"peri"},{"label":"M","units":"deg","name":"ma","sigma":"1.7e-06","value":"253","title":"mean anomaly"},{"title":"time of perihelion passage","value":"2461602.192","label":"tp","units":"TDB","name":"tp","sigma":"6.6e-06"},{"value":"1350","title":"sidereal orbital period","label":"period","units":"d","name":"per","sigma":"9.5e-07"},{"label":"n","units":"deg/d","name":"n","sigma":"1.9e-10","title":"mean motion","value":"0.267"},{"name":"ad","sigma":"1.3e-09","units":"au","label":"Q","title":"aphelion distance","value":"2.68"}],"last_obs":"2025-10-04","pe_used":"DE441","n_obs_used":4122,"n_dop_obs_used":null,"t_jup":"3.518","not_valid_before":null,"moid_jup":"2.57","model_pars":[],"first_obs":"1849-07-31","epoch":"2461200.5","equinox":"J2000","moid":"1.11","source":"JPL","orbit_id":"148","data_arc":"64348","sb_used":"SB441-N16"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"neo":false,"pha":false,"orbit_id":"148","prefix":null,"kind":"an","spkid":"20000009","shortname":"9 Metis","des":"9","fullname":"9 Metis (A848 HA)"},"phys_par":[{"units":null,"name":"H","sigma":null,"notes":null,"value":"6.18","title":"absolute magnitude","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","ref":"MPO964264"},{"title":"magnitude slope","notes":"Fit","desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","value":"0.17","ref":"PDS3 (MPC 17257)","name":"G","sigma":null,"units":null},{"ref":"Dunham Occult. list: Kristensen 1984b","value":"190","notes":"Yeomans E-mail 2001-Apr-04","title":"diameter","desc":"effective body diameter","name":"diameter","sigma":null,"units":"km"},{"notes":"REFERENCE LIST:[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.], [Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 529-546.], [Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.], [Schober, H.J.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 38, 269-274.], [Zappala, V.; van Houten-Groeneveld, I. (1979) Icarus 40, 289-296.], [Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.], [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.], [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.], [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.], [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.], [Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.], [Magnusson, P. (1990) Icarus 85, 229-240.], [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.], [Richmond, E.H.; Neely, A.W. (1994) Minor Planet Bull. 21, 23-24.], [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.], [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.], [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.], [Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/asteroids3D/web.php], [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.], [Vernazza, P.; Ferrais, M.; Jorda, L.; Hanus, J.; et al. (2021) Astron. Astrophys 654, id. A56.]","title":"rotation period","value":"5.079","desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","units":"h","sigma":null,"name":"rot_per"},{"units":null,"name":"albedo","sigma":null,"ref":"EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD","notes":"TRIAD quality code 3","value":"0.118","desc":"geometric albedo","title":"geometric albedo"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=23; phase (min.=2.98, mean=9.80, max.=26.91) deg.","title":"B-V","desc":"color index B-V magnitude difference","value":"0.858","units":null,"sigma":"0.020","name":"BV"},{"units":null,"name":"UB","sigma":"0.030","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=20; phase (min.=2.98, mean=10.36, max.=26.91) deg.","desc":"color index U-B magnitude difference","title":"U-B","value":"0.496"},{"sigma":null,"name":"spec_T","units":null,"notes":"used 7 color indices; used ground-based radiometric albedo","title":"Tholen spectral type","desc":"Tholen spectral taxonomic classification","value":"S","ref":"EAR-A-5-DDR-TAXONOMY-V4.0"}]}
