{"object":{"pha":false,"kind":"an","prefix":null,"orbit_id":"170","fullname":"19 Fortuna (A852 QA)","shortname":"19 Fortuna","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"neo":false,"spkid":"20000019","des":"19"},"phys_par":[{"title":"absolute magnitude","sigma":null,"ref":"E2024-VJ5","units":null,"name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","value":"7.49","notes":null},{"notes":"Fit","value":"0.10","units":null,"name":"G","desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","ref":"PDS3 (MPC 17257)","sigma":null,"title":"magnitude slope"},{"desc":"effective body diameter","units":"km","name":"diameter","value":"200","notes":null,"title":"diameter","sigma":null,"ref":"J.G. Williams 9-90"},{"title":"rotation period","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","desc":"body rotation period (synodic)","units":"h","name":"rot_per","notes":"REFERENCE LIST:[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.], [Van Houten-Groeneveld, I.; van Houten, C.J.; Zappala, V. (1979) Astron. Astrophys. Suppl. Ser. 35, 223-232.], [Lupishko, D.F.; Tupieva, F.A.; Velichko, F.P.; Kiselev, N.N.; Chernova, G.P. (1981) Astron. Vestn. 15, 25-31; Solar System Res. 15, 19-24.], [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.], [Magnusson, P. (1990) Icarus 85, 229-240.], [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.], [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.], [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.], [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.], [Blanco, C.; Di Martino, M.; Dotto, E.; Gilmore, A.C.; et al. (1996) Planet. Space Sci. 44, 87-91.], [Denchev, P. (1999) Abstracts of ACM 1999, 117.], [Harris, A.W.; Young, J.W.; Bowell, E.; Tholen, D.J. (1999) Icarus 142, 173-201.], [Denchev, P. (2000) Planet. Space Sci. 48, 987-992.], [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.], [Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.], [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Drummond, J.; Merline, W.J.; Conrad, A.; Christou, J.; et al. (2011) EPSC-DPS2011 #1426.], [Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/asteroids3D/web.php], [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.], [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.], [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.], [Behrend, R. (2023) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Polakis, T. (2023) Minor Planet Bull. 50, 267-270.]","value":"7.4432"},{"title":"geometric albedo","sigma":null,"ref":"EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD","desc":"geometric albedo","name":"albedo","units":null,"notes":"TRIAD quality code 3","value":"0.037"},{"value":"0.719","notes":"#obs=38; phase (min.=1.00, mean=9.64, max.=28.27) deg.","desc":"color index B-V magnitude difference","units":null,"name":"BV","sigma":"0.014","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"B-V"},{"units":null,"name":"UB","desc":"color index U-B magnitude difference","notes":"#obs=30; phase (min.=1.00, mean=8.23, max.=22.69) deg.","value":"0.324","title":"U-B","sigma":"0.046","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2"},{"units":null,"name":"spec_T","desc":"Tholen spectral taxonomic classification","value":"G","notes":"used 7 color indices; used ground-based radiometric albedo","title":"Tholen spectral type","sigma":null,"ref":"EAR-A-5-DDR-TAXONOMY-V4.0"},{"desc":"SMASSII spectral taxonomic classification","name":"spec_B","units":null,"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","value":"Ch","title":"SMASSII spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null}],"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"orbit":{"source":"JPL","last_obs":"2026-04-08","orbit_id":"170","two_body":null,"n_del_obs_used":null,"first_obs":"1852-09-14","elements":[{"name":"e","units":null,"title":"eccentricity","label":"e","sigma":"2.9e-09","value":"0.158"},{"name":"a","units":"au","title":"semi-major axis","label":"a","sigma":"1.2e-09","value":"2.44"},{"units":"au","name":"q","label":"q","title":"perihelion distance","value":"2.06","sigma":"7.3e-09"},{"sigma":"2.9e-07","value":"1.57","label":"i","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg"},{"sigma":"7.9e-06","value":"211","label":"node","title":"longitude of the ascending node","name":"om","units":"deg"},{"sigma":"8e-06","value":"182","label":"peri","title":"argument of perihelion","name":"w","units":"deg"},{"units":"deg","name":"ma","title":"mean anomaly","label":"M","value":"148","sigma":"1.6e-06"},{"value":"2460626.629","sigma":"5.8e-06","title":"time of perihelion passage","label":"tp","units":"TDB","name":"tp"},{"title":"sidereal orbital period","label":"period","units":"d","name":"per","sigma":"1.1e-06","value":"1390"},{"title":"mean motion","label":"n","units":"deg/d","name":"n","sigma":"2e-10","value":"0.258"},{"label":"Q","title":"aphelion distance","units":"au","name":"ad","value":"2.83","sigma":"1.4e-09"}],"equinox":"J2000","moid":"1.06","rms":"0.34","n_dop_obs_used":null,"soln_date":"2026-06-05 03:03:25","not_valid_before":null,"epoch":"2461200.5","producer":"Otto Matic","t_jup":"3.483","condition_code":"0","sb_used":"SB441-N16","data_arc":"63393","not_valid_after":null,"cov_epoch":"2457986.5","model_pars":[],"pe_used":"DE441","moid_jup":"2.6","comment":null,"n_obs_used":9643}}