{"orbit":{"cov_epoch":"2457494.5","rms":"0.36","n_del_obs_used":null,"elements":[{"sigma":"1.1e-09","units":null,"name":"e","value":"0.174","label":"e","title":"eccentricity"},{"units":"au","name":"a","value":"2.21","label":"a","title":"semi-major axis","sigma":"5.4e-10"},{"title":"perihelion distance","label":"q","value":"1.83","name":"q","units":"au","sigma":"2.5e-09"},{"title":"inclination; angle with respect to x-y ecliptic plane","label":"i","value":"4.1","name":"i","units":"deg","sigma":"5.3e-08"},{"title":"longitude of the ascending node","label":"node","name":"om","value":"253","units":"deg","sigma":"8.4e-07"},{"sigma":"8.7e-07","name":"w","value":"130","units":"deg","label":"peri","title":"argument of perihelion"},{"units":"deg","name":"ma","value":"113","label":"M","title":"mean anomaly","sigma":"4.2e-07"},{"sigma":"1.3e-06","label":"tp","title":"time of perihelion passage","value":"2460823.998","name":"tp","units":"TDB"},{"sigma":"4.4e-07","label":"period","title":"sidereal orbital period","units":"d","name":"per","value":"1200"},{"sigma":"1.1e-10","label":"n","title":"mean motion","value":"0.3","name":"n","units":"deg/d"},{"label":"Q","title":"aphelion distance","units":"au","name":"ad","value":"2.59","sigma":"6.3e-10"}],"producer":"Otto Matic","n_obs_used":6315,"soln_date":"2026-06-05 04:16:02","epoch":"2461200.5","source":"JPL","last_obs":"2026-04-11","comment":null,"first_obs":"1913-12-19","not_valid_after":null,"sb_used":"SB441-N16","model_pars":[],"data_arc":"41021","moid_jup":"2.87","orbit_id":"162","condition_code":"0","two_body":null,"t_jup":"3.635","pe_used":"DE441","n_dop_obs_used":null,"moid":"0.832","equinox":"J2000","not_valid_before":null},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"ref":"MPO980536","desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","units":null,"notes":null,"value":"11.49","name":"H","title":"absolute magnitude","sigma":null},{"title":"diameter","value":"12.2","notes":"Yeomans E-mail 2001-Apr-04","name":"diameter","sigma":null,"units":"km","desc":"effective body diameter","ref":null},{"ref":"Thomas, P.C. et al. (1994) Icarus v.107, pp.23-36","desc":"tri(or bi)-axial body dimensions","units":"km","sigma":null,"title":"extent","value":"18.2x10.5x8.9","notes":null,"name":"extent"},{"title":"rotation period","notes":"REFERENCE LIST:[Barucci, M.A.; Fulchignoni, M.; Di Martino, M. (1989) Bull. Amer. Astron. Soc. 21, 963.], [Di Martino, M.; Ferreri, W.; Fulchignoni, M.; De Angelis, G.; et al. (1990) Icarus 87, 372-376.], [Goldader, J.D.; Tholen, D.J.; Cruikshank, D.P.; Hartmann, W.K. (1991) Astron. J. 102, 1503-1509.], [De Angelis, G. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.], [Magnusson, P.; Barucci, M.A.; Binzel, R.P.; Blanco, C.; et al. (1992) Icarus 97, 124-129.], [Wisniewski, W.Z.; Barucci, M.A.; Fulchignoni, M.; De Sanctis, C.; et al. (1993) Icarus 101, 213-222.], [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.], [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.], [Tungalag, N.; Shevchenko, V.G.; Lupishko, D.F. (2002) Kin. Fiz. Neb. Tel 18, 508-516; Kinematics and Physics of Celestial Bodies 18, ???-???.], [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.], [Dykhuis, M.J.; Molnar, L.A.; Gates, C.J.; Gonzales, J.A.; et al. (2016) Icarus 267, 174-203.], [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]","value":"7.042","name":"rot_per","sigma":null,"units":"h","desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009"},{"units":null,"desc":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","title":"geometric albedo","value":"0.246","notes":null,"name":"albedo","sigma":"0.032"},{"desc":"color index B-V magnitude difference","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","units":null,"title":"B-V","value":"0.870","notes":"#obs=1; phase=19.53 deg.","name":"BV","sigma":"0.030"},{"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","desc":"color index U-B magnitude difference","units":null,"sigma":"0.049","title":"U-B","name":"UB","notes":"#obs=1; phase=19.53 deg.","value":"0.554"},{"units":null,"desc":"Tholen spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","sigma":null,"title":"Tholen spectral type","notes":"used 7 color indices","value":"S","name":"spec_T"},{"desc":"SMASSII spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","units":null,"notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","name":"spec_B","value":"S","title":"SMASSII spectral type","sigma":null}],"object":{"des":"951","pha":false,"orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"orbit_id":"162","neo":false,"spkid":"20000951","prefix":null,"shortname":"951 Gaspra","fullname":"951 Gaspra (A916 OJ)","kind":"an"}}