{"id":28584,"slug":"10503-johnmarks","name":"10503 Johnmarks","domain":"solar-system","class":"asteroid","otype":null,"otype_label":"Asteroid","ra":null,"dec":null,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":null,"vmag":null,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":0,"simbad_oid":null,"gaia_dr3":null,"jpl_spkid":20010503,"ned_name":null,"exo_name":null,"host_object_id":null,"depth":0,"deep_at":null,"views":7,"first_seen":"2026-08-14T16:44:22.692977+00:00","updated_at":"2026-08-14T17:22:10.067085+00:00","identifiers":["10503","10503 Johnmarks","10503 Johnmarks (1987 SG13)","Johnmarks"],"measurements":[],"orbit":{"object_id":28584,"epoch_jd":2461200.5,"a_au":2.221,"e":0.1144,"i_deg":4.71,"om_deg":22.18,"w_deg":28.5,"ma_deg":208.2,"q_au":1.967,"ad_au":2.48,"period_d":1210.0,"moid_au":0.978,"orbit_class":"MBA","neo":false,"pha":false,"h_mag":14.28,"diameter_km":3.97,"albedo":0.213,"rot_period_h":5.29806,"spec_b":null,"spec_t":null,"condition_code":"0","n_obs":5340,"arc_days":26103,"first_obs":"1954-10-22","last_obs":"2026-04-10","producer":"Otto Matic","source":"jpl-sbdb","updated_at":"2026-08-14T17:22:10.067085+00:00"},"exoplanet":null,"sources":[]}