{"object":{"spkid":"20000040","pha":false,"orbit_id":"154","neo":false,"orbit_class":{"name":"Main-belt Asteroid","code":"MBA"},"kind":"an","prefix":null,"des":"40","fullname":"40 Harmonia (A856 FA)","shortname":"40 Harmonia"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"orbit":{"condition_code":"0","not_valid_after":null,"soln_date":"2026-06-05 03:04:37","two_body":null,"n_del_obs_used":null,"producer":"Otto Matic","comment":null,"rms":"0.32","cov_epoch":"2457725.5","t_jup":"3.610","n_dop_obs_used":null,"n_obs_used":11061,"pe_used":"DE441","last_obs":"2026-04-07","elements":[{"title":"eccentricity","value":"0.0467","label":"e","units":null,"sigma":"3.2e-09","name":"e"},{"value":"2.27","title":"semi-major axis","label":"a","units":"au","name":"a","sigma":"1.2e-09"},{"units":"au","label":"q","name":"q","sigma":"7.3e-09","value":"2.16","title":"perihelion distance"},{"sigma":"2.5e-07","name":"i","label":"i","units":"deg","value":"4.26","title":"inclination; angle with respect to x-y ecliptic plane"},{"title":"longitude of the ascending node","value":"94.2","units":"deg","label":"node","name":"om","sigma":"4.1e-06"},{"title":"argument of perihelion","value":"270","sigma":"5.3e-06","name":"w","units":"deg","label":"peri"},{"sigma":"3.3e-06","name":"ma","label":"M","units":"deg","value":"138","title":"mean anomaly"},{"label":"tp","units":"TDB","name":"tp","sigma":"1.1e-05","title":"time of perihelion passage","value":"2460722.741"},{"title":"sidereal orbital period","value":"1250","units":"d","label":"period","name":"per","sigma":"1e-06"},{"label":"n","units":"deg/d","name":"n","sigma":"2.3e-10","value":"0.289","title":"mean motion"},{"units":"au","label":"Q","name":"ad","sigma":"1.3e-09","value":"2.37","title":"aphelion distance"}],"sb_used":"SB441-N16","data_arc":"60536","orbit_id":"154","moid":"1.16","source":"JPL","first_obs":"1860-07-10","model_pars":[],"equinox":"J2000","epoch":"2461200.5","not_valid_before":null,"moid_jup":"2.8"},"phys_par":[{"notes":"IRAS observations used: 21","value":"6.57","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","title":"absolute magnitude","ref":"MPO980521","sigma":null,"name":"H","units":null},{"ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"diameter","notes":null,"value":"111.251","desc":"effective body diameter","name":"diameter","sigma":"0.391","units":"km"},{"units":"h","sigma":null,"name":"rot_per","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","notes":"REFERENCE LIST:[Gehrels, T.; Owings, D. (1962) Astrophys. J. 135, 906-924.], [Lagerkvist, C.-I. (1978) Astron. Astrophys. Suppl. Ser. 31, 361-381.], [Gallardo, T.; Tancredi, G. (1987) Rev. Mexicana Astron. Astrof. 15, 103-105.], [Tancredi, G.; Gallardo, T. (1987) Bol. Asoc. Argent. Astron. 33, 361-368.], [Michalowski, T. (1993) Icarus 106, 563-572.], [Armstrong, J.C.; Nellermoe, B.L.; Reitzler, L.E. (1996) I.A.P.P.P. Comm. 63, 59-68.], [Lopez-Gonzalez, M.J.; Rodriguez, E. (1999) Astron. Astrophys. Suppl. Ser. 139, 565-574.], [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Alton, K.B. (2009) Minor Planet Bull. 36, 86.], [Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.], [Pilcher, F. (2010) Minor Planet Bull. 37, 167.], [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.], [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.], [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.], [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]","value":"8.91","desc":"body rotation period (synodic)","title":"rotation period"},{"name":"albedo","sigma":"0.047","units":null,"ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","desc":"geometric albedo","notes":null,"title":"geometric albedo","value":"0.220"},{"sigma":"0.026","name":"BV","units":null,"value":"0.854","notes":"#obs=10; phase (min.=3.66, mean=13.95, max.=26.56) deg.","desc":"color index B-V magnitude difference","title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2"},{"sigma":"0.020","name":"UB","units":null,"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=10; phase (min.=3.66, mean=13.95, max.=26.56) deg.","title":"U-B","desc":"color index U-B magnitude difference","value":"0.432"},{"units":null,"name":"spec_T","sigma":null,"notes":"used 7 color indices; used ground-based radiometric albedo","value":"S","desc":"Tholen spectral taxonomic classification","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0"},{"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","title":"SMASSII spectral type","value":"S","desc":"SMASSII spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"name":"spec_B","units":null}]}