{"phys_par":[{"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","name":"H","value":"5.97","ref":"MPO745323","notes":null,"title":"absolute magnitude","units":null,"sigma":null},{"desc":"effective body diameter","name":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","value":"179.484","notes":null,"title":"diameter","units":"km","sigma":"1.685"},{"title":"rotation period","units":"h","sigma":null,"desc":"body rotation period (synodic)","name":"rot_per","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","value":"5.138","notes":"REFERENCE LIST:[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.], [Cailliate, C. (1956) Publ. Observ. Lyon 3, fasc. 28.], [Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.], [Cailliate, C. (1960) Bull. Astronomique XXIII, fasc. III.], [Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.], [Sather, R.E. (1976) Astron. J. 81, 67-73.], [Chang, Y.C.; Zhou, X.-h.; Yang, X.-y.; Zhang, Y.-y.; et al. (1981) Acta Astron. Sin. 22, 169-173; Chin. Astron. Astrophys. 5, 434-437.], [Lupishko, D.F.; Belskaja, I.N.; Velichko, F.P. (1985) Vestn. Kharkov Univ. 278, 51-56.], [Magnusson, P. (1986) Icarus 68, 1-39.], [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.], [Magnusson, P. (1990) Icarus 85, 229-240.], [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.], [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.], [Behrend, R. (1998) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.], [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [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], [Carry, B.; Kaasalainen, M.; Leyrat, C.; Merline, W.J.; et al. (2010) Astron. Astrophys. 523, A94.], [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.], [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.], [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.], [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.], [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.], [Behrend, R. (2023) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]"},{"sigma":"0.043","units":null,"title":"geometric albedo","notes":null,"desc":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)","value":"0.269","name":"albedo"},{"notes":"#obs=28; phase (min.=4.80, mean=15.00, max.=23.24) deg.","value":"0.898","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","name":"BV","desc":"color index B-V magnitude difference","sigma":"0.020","units":null,"title":"B-V"},{"notes":"#obs=16; phase (min.=6.05, mean=14.21, max.=21.85) deg.","desc":"color index U-B magnitude difference","name":"UB","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","value":"0.494","units":null,"sigma":"0.028","title":"U-B"},{"units":null,"sigma":null,"title":"Tholen spectral type","notes":"used 7 color indices; used ground-based radiometric albedo","name":"spec_T","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"S","desc":"Tholen spectral taxonomic classification"},{"units":null,"sigma":null,"title":"SMASSII spectral type","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","desc":"SMASSII spectral taxonomic classification","name":"spec_B","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"S"}],"orbit":{"soln_date":"2026-06-05 03:04:36","orbit_id":"142","producer":"Otto Matic","condition_code":"0","elements":[{"name":"e","title":"eccentricity","value":"0.114","label":"e","units":null,"sigma":"3e-09"},{"label":"a","units":"au","sigma":"2.1e-09","name":"a","title":"semi-major axis","value":"2.77"},{"label":"q","sigma":"8.7e-09","units":"au","value":"2.45","name":"q","title":"perihelion distance"},{"title":"inclination; angle with respect to x-y ecliptic plane","name":"i","value":"10.4","units":"deg","sigma":"3.2e-07","label":"i"},{"name":"om","title":"longitude of the ascending node","value":"157","units":"deg","sigma":"1.5e-06","label":"node"},{"label":"peri","sigma":"2.1e-06","units":"deg","value":"210","name":"w","title":"argument of perihelion"},{"sigma":"1.9e-06","units":"deg","label":"M","value":"137","title":"mean anomaly","name":"ma"},{"value":"2460561.755","name":"tp","title":"time of perihelion passage","sigma":"8.4e-06","units":"TDB","label":"tp"},{"value":"1680","title":"sidereal orbital period","name":"per","sigma":"2e-06","units":"d","label":"period"},{"units":"deg/d","sigma":"2.5e-10","label":"n","name":"n","title":"mean motion","value":"0.214"},{"title":"aphelion distance","name":"ad","value":"3.08","units":"au","sigma":"2.4e-09","label":"Q"}],"moid_jup":"2.36","comment":null,"n_del_obs_used":null,"not_valid_after":null,"rms":"0.25","pe_used":"DE441","epoch":"2461200.5","sb_used":"SB441-N16","first_obs":"1856-02-28","n_obs_used":12438,"two_body":null,"moid":"1.46","source":"JPL","equinox":"J2000","n_dop_obs_used":null,"not_valid_before":null,"last_obs":"2026-04-09","t_jup":"3.305","data_arc":"62132","model_pars":[],"cov_epoch":"2457856.5"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"object":{"spkid":"20000039","neo":false,"shortname":"39 Laetitia","des":"39","kind":"an","orbit_id":"142","prefix":null,"pha":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"fullname":"39 Laetitia (A856 CA)"}}