{"object":{"prefix":null,"shortname":"1269 Rollandia","pha":false,"spkid":"20001269","neo":false,"des":"1269","kind":"an","fullname":"1269 Rollandia (1930 SH)","orbit_class":{"code":"OMB","name":"Outer Main-belt Asteroid"},"orbit_id":"75"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"orbit":{"source":"JPL","producer":"Otto Matic","two_body":null,"n_obs_used":6528,"first_obs":"1902-03-03","orbit_id":"75","pe_used":"DE441","moid":"2.56","rms":"0.35","sb_used":"SB441-N16","model_pars":[],"cov_epoch":"2458299.5","last_obs":"2026-04-07","not_valid_after":null,"condition_code":"0","n_del_obs_used":null,"elements":[{"label":"e","units":null,"sigma":"1.5e-09","name":"e","value":"0.0973","title":"eccentricity"},{"sigma":"6.5e-09","title":"semi-major axis","value":"3.93","name":"a","label":"a","units":"au"},{"label":"q","units":"au","sigma":"7.3e-09","value":"3.55","name":"q","title":"perihelion distance"},{"label":"i","units":"deg","sigma":"8e-08","name":"i","value":"2.76","title":"inclination; angle with respect to x-y ecliptic plane"},{"sigma":"1.5e-06","title":"longitude of the ascending node","name":"om","value":"135","label":"node","units":"deg"},{"value":"15.6","name":"w","title":"argument of perihelion","sigma":"1.9e-06","units":"deg","label":"peri"},{"sigma":"5.6e-07","name":"ma","value":"329","title":"mean anomaly","label":"M","units":"deg"},{"name":"tp","value":"2461444.854","title":"time of perihelion passage","sigma":"4.4e-06","units":"TDB","label":"tp"},{"sigma":"7e-06","value":"2850","name":"per","title":"sidereal orbital period","label":"period","units":"d"},{"title":"mean motion","name":"n","value":"0.127","sigma":"3.1e-10","units":"deg/d","label":"n"},{"sigma":"7.1e-09","title":"aphelion distance","value":"4.31","name":"ad","label":"Q","units":"au"}],"soln_date":"2026-06-05 04:44:20","comment":null,"moid_jup":"0.692","t_jup":"3.052","not_valid_before":null,"epoch":"2461200.5","equinox":"J2000","n_dop_obs_used":null,"data_arc":"45326"},"phys_par":[{"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","name":"H","notes":"IRAS observations used: 18","sigma":null,"units":null,"title":"absolute magnitude","ref":"E2026-EA1","value":"8.76"},{"units":"km","value":"104.893","title":"diameter","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)","desc":"effective body diameter","notes":null,"sigma":"1.042","name":"diameter"},{"name":"rot_per","notes":"[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.]  REFERENCE LIST:[Polakis, T. (2020) Minor Planet Bull. 47, 314-321.]","sigma":null,"desc":"body rotation period (synodic)","title":"rotation period","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","value":"60.45","units":"h"},{"desc":"geometric albedo","notes":null,"sigma":"0.009","name":"albedo","units":null,"value":"0.048","title":"geometric albedo","ref":"urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)"},{"desc":"color index B-V magnitude difference","name":"BV","notes":"#obs=1; phase=15.20 deg.","sigma":"0.020","units":null,"ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","title":"B-V","value":"0.775"},{"name":"UB","sigma":"0.032","notes":"#obs=1; phase=15.20 deg.","desc":"color index U-B magnitude difference","title":"U-B","ref":"EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2","value":"0.271","units":null},{"notes":"used 7 color indices","sigma":null,"name":"spec_T","desc":"Tholen spectral taxonomic classification","ref":"EAR-A-5-DDR-TAXONOMY-V4.0","title":"Tholen spectral type","value":"D","units":null}]}