{"object":{"shortname":"951 Gaspra","orbit_id":"162","spkid":"20000951","fullname":"951 Gaspra (A916 OJ)","pha":false,"kind":"an","orbit_class":{"code":"MBA","name":"Main-belt Asteroid"},"prefix":null,"des":"951","neo":false},"orbit":{"condition_code":"0","comment":null,"producer":"Otto Matic","not_valid_before":null,"n_dop_obs_used":null,"epoch":"2461200.5","moid_jup":"2.87","cov_epoch":"2457494.5","moid":"0.832","two_body":null,"soln_date":"2026-06-05 04:16:02","t_jup":"3.635","first_obs":"1913-12-19","not_valid_after":null,"n_obs_used":6315,"sb_used":"SB441-N16","equinox":"J2000","orbit_id":"162","data_arc":"41021","n_del_obs_used":null,"last_obs":"2026-04-11","model_pars":[],"source":"JPL","elements":[{"title":"eccentricity","units":null,"name":"e","value":"0.174","sigma":"1.1e-09","label":"e"},{"value":"2.21","label":"a","sigma":"5.4e-10","title":"semi-major axis","name":"a","units":"au"},{"units":"au","name":"q","title":"perihelion distance","sigma":"2.5e-09","label":"q","value":"1.83"},{"value":"4.1","label":"i","sigma":"5.3e-08","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","name":"i"},{"units":"deg","name":"om","title":"longitude of the ascending node","sigma":"8.4e-07","label":"node","value":"253"},{"units":"deg","name":"w","title":"argument of perihelion","label":"peri","sigma":"8.7e-07","value":"130"},{"units":"deg","name":"ma","title":"mean anomaly","sigma":"4.2e-07","label":"M","value":"113"},{"value":"2460823.998","label":"tp","sigma":"1.3e-06","title":"time of perihelion passage","units":"TDB","name":"tp"},{"title":"sidereal orbital period","units":"d","name":"per","value":"1200","sigma":"4.4e-07","label":"period"},{"value":"0.3","label":"n","sigma":"1.1e-10","title":"mean motion","units":"deg/d","name":"n"},{"title":"aphelion distance","units":"au","name":"ad","value":"2.59","label":"Q","sigma":"6.3e-10"}],"pe_used":"DE441","rms":"0.36"},"phys_par":[{"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","ref":"MPO980536","title":"absolute magnitude","name":"H","units":null,"notes":null,"value":"11.49","sigma":null},{"desc":"effective body diameter","ref":null,"title":"diameter","units":"km","name":"diameter","value":"12.2","notes":"Yeomans E-mail 2001-Apr-04","sigma":null},{"desc":"tri(or bi)-axial body dimensions","ref":"Thomas, P.C. et al. (1994) Icarus v.107, pp.23-36","title":"extent","name":"extent","units":"km","notes":null,"value":"18.2x10.5x8.9","sigma":null},{"value":"7.042","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]","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","desc":"body rotation period (synodic)","units":"h","name":"rot_per"},{"units":null,"name":"albedo","desc":"geometric albedo","title":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)","sigma":"0.032","value":"0.246","notes":null},{"name":"BV","units":null,"desc":"color index B-V magnitude difference","title":"B-V","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","sigma":"0.030","notes":"#obs=1; phase=19.53 deg.","value":"0.870"},{"value":"0.554","notes":"#obs=1; phase=19.53 deg.","sigma":"0.049","title":"U-B","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","desc":"color index U-B magnitude difference","units":null,"name":"UB"},{"sigma":null,"value":"S","notes":"used 7 color indices","units":null,"name":"spec_T","title":"Tholen spectral type","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","desc":"Tholen spectral taxonomic classification"},{"sigma":null,"value":"S","notes":"based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)","units":null,"name":"spec_B","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"SMASSII spectral type","desc":"SMASSII spectral taxonomic classification"}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"}}