{"id":6546,"slug":"hat-p-57","name":"HAT-P-57","domain":"deep-sky","class":"star","otype":null,"otype_label":"Star","ra":274.743418,"dec":10.5971968,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":279.86,"vmag":null,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":"A8 V","morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":0,"simbad_oid":null,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":null,"host_object_id":null,"depth":0,"deep_at":null,"views":2,"first_seen":"2026-08-14T16:25:51.971135+00:00","updated_at":"2026-08-14T16:25:51.971135+00:00","identifiers":[],"measurements":[{"parameter":"effective_temperature","value":6330.0,"value_text":null,"unit":"K","err_plus":124.0,"err_minus":124.0,"band":null,"method":null,"source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"effective_temperature","value":6848.0,"value_text":null,"unit":"K","err_plus":167.4,"err_minus":167.4,"band":null,"method":null,"source":"nasa-exo","reference":"ExoFOP","ref_year":2015},{"parameter":"effective_temperature","value":7500.0,"value_text":null,"unit":"K","err_plus":250.0,"err_minus":250.0,"band":null,"method":null,"source":"nasa-exo","reference":"Hartman et al. 2015","ref_year":2015},{"parameter":"mass","value":2.77,"value_text":null,"unit":"M_sun","err_plus":1.74,"err_minus":1.74,"band":null,"method":null,"source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"mass","value":1.47,"value_text":null,"unit":"M_sun","err_plus":0.12,"err_minus":0.12,"band":null,"method":null,"source":"nasa-exo","reference":"Hartman et al. 2015","ref_year":2015},{"parameter":"radius","value":1.85,"value_text":null,"unit":"R_sun","err_plus":0.39,"err_minus":0.39,"band":null,"method":null,"source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"radius","value":1.5,"value_text":null,"unit":"R_sun","err_plus":0.05,"err_minus":0.05,"band":null,"method":null,"source":"nasa-exo","reference":"Hartman et al. 2015","ref_year":2015},{"parameter":"radius","value":1.51554,"value_text":null,"unit":"R_sun","err_plus":0.064839,"err_minus":0.064839,"band":null,"method":null,"source":"nasa-exo","reference":"ExoFOP","ref_year":2015}],"orbit":null,"exoplanet":null,"sources":[]}