{"object":{"neo":false,"spkid":"20000069","des":"69","shortname":"69 Hesperia","prefix":null,"pha":false,"orbit_id":"158","kind":"an","fullname":"69 Hesperia (A861 HC)","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"}},"orbit":{"moid_jup":"1.72","comment":null,"n_del_obs_used":null,"elements":[{"label":"e","units":null,"sigma":"2.4e-09","title":"eccentricity","name":"e","value":"0.169"},{"value":"2.98","name":"a","title":"semi-major axis","sigma":"2.8e-09","units":"au","label":"a"},{"name":"q","title":"perihelion distance","value":"2.47","label":"q","units":"au","sigma":"8.6e-09"},{"label":"i","units":"deg","sigma":"2.2e-07","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","value":"8.59"},{"name":"om","title":"longitude of the ascending node","value":"185","units":"deg","sigma":"1.1e-06","label":"node"},{"sigma":"1.3e-06","units":"deg","label":"peri","value":"288","name":"w","title":"argument of perihelion"},{"sigma":"1.4e-06","units":"deg","label":"M","value":"81.2","name":"ma","title":"mean anomaly"},{"value":"2460777.504","name":"tp","title":"time of perihelion passage","sigma":"6.6e-06","units":"TDB","label":"tp"},{"sigma":"2.6e-06","units":"d","label":"period","value":"1880","title":"sidereal orbital period","name":"per"},{"sigma":"2.7e-10","units":"deg/d","label":"n","value":"0.192","name":"n","title":"mean motion"},{"value":"3.48","title":"aphelion distance","name":"ad","sigma":"3.2e-09","units":"au","label":"Q"}],"condition_code":"0","producer":"Otto Matic","orbit_id":"158","soln_date":"2026-06-05 03:07:02","last_obs":"2026-04-13","t_jup":"3.222","cov_epoch":"2457918.5","data_arc":"60249","model_pars":[],"n_dop_obs_used":null,"not_valid_before":null,"two_body":null,"source":"JPL","moid":"1.51","equinox":"J2000","n_obs_used":5224,"first_obs":"1861-04-29","sb_used":"SB441-N16","pe_used":"DE441","epoch":"2461200.5","rms":"0.37","not_valid_after":null},"phys_par":[{"title":"absolute magnitude","sigma":null,"units":null,"value":"7.21","ref":"MPO980522","name":"H","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","notes":"IRAS observations used: 3"},{"desc":"magnitude slope parameter used in the standard asteroid H/G magnitude law","value":"0.19","ref":"PDS3 (MPC 17257)","name":"G","notes":"Fit","title":"magnitude slope","sigma":null,"units":null},{"desc":"effective body diameter","name":"diameter","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","value":"138.13","notes":"IRAS observations used: 3","title":"diameter","units":"km","sigma":"4.7"},{"title":"rotation period","sigma":null,"units":"h","desc":"body rotation period (synodic)","value":"5.655","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","name":"rot_per","notes":"REFERENCE LIST:[Poutanen, M.; Bowell, E.; Martin, L.J.; Thompson, D.T. (1985) Astron. Astrophys. Suppl. Ser. 61, 291-297.], [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.], [Velichko, F.P.; Krugly, Yu.N. (1989) In 'Methods of investigation of movement, physics and dynamic of Solar System small bodies, Dushanbe, p. 14-15 (in Russian).], [De Angelis, G.; Mottola, S. (1995) Planet. Space Sci. 43, 1013-1017.], [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.], [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.], [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.], [Shevchenko, V.G.; Velichko, F.P.; Checha, V.A.; Krugly, Y.N. (2014) Minor Planet Bull. 41, 195-198.], [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Behrend, R. (2023) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]"},{"notes":"IRAS observations used: 3","desc":"geometric albedo","ref":"IRAS-A-FPA-3-RDR-IMPS-V6.0","value":"0.1402","name":"albedo","sigma":"0.010","units":null,"title":"geometric albedo"},{"notes":"#obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg.","value":"0.674","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","name":"BV","desc":"color index B-V magnitude difference","sigma":"0.021","units":null,"title":"B-V"},{"title":"U-B","units":null,"sigma":"0.045","desc":"color index U-B magnitude difference","name":"UB","value":"0.230","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","notes":"#obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg."},{"value":"M","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","name":"spec_T","desc":"Tholen spectral taxonomic classification","notes":"used 7 color indices; used ground-based radiometric albedo","title":"Tholen spectral type","sigma":null,"units":null},{"sigma":null,"units":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","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","value":"X","name":"spec_B"}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"}}