{"id":5917,"slug":"kepler-257-c","name":"Kepler-257 c","domain":"exoplanet","class":"exoplanet","otype":null,"otype_label":"Exoplanet","ra":297.3159994,"dec":46.0232642,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":780.256,"vmag":15.652,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":19,"simbad_oid":8584048,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":"Kepler-257 c","host_object_id":2799923,"depth":0,"deep_at":null,"views":2,"first_seen":"2026-08-14T16:25:51.971135+00:00","updated_at":"2026-09-13T03:31:17.289698+00:00","identifiers":["Kepler-257c"],"measurements":[{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q12 KOI Table","ref_year":2014},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 KOI Table","ref_year":2014},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q8 KOI Table","ref_year":2014},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR24 KOI Table","ref_year":2014},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q16 KOI Table","ref_year":2014},{"parameter":"equilibrium_temperature","value":881.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q16 KOI Table","ref_year":2014},{"parameter":"equilibrium_temperature","value":775.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q8 KOI Table","ref_year":2014},{"parameter":"equilibrium_temperature","value":881.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q12 KOI Table","ref_year":2014},{"parameter":"equilibrium_temperature","value":881.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR24 KOI Table","ref_year":2014},{"parameter":"equilibrium_temperature","value":881.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.5814785507,"value_text":null,"unit":"d","err_plus":4.772e-06,"err_minus":4.772e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Gajdoš et al. 2019","ref_year":2019},{"parameter":"orbital_period","value":6.581478842,"value_text":null,"unit":"d","err_plus":5.012e-06,"err_minus":5.012e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Fulton & Petigura 2018","ref_year":2018},{"parameter":"orbital_period","value":6.581478842,"value_text":null,"unit":"d","err_plus":5.012e-06,"err_minus":5.012e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Morton et al. 2016","ref_year":2016},{"parameter":"orbital_period","value":6.58148439,"value_text":null,"unit":"d","err_plus":8.6e-07,"err_minus":8.6e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Holczer et al. 2016","ref_year":2016},{"parameter":"orbital_period","value":6.581478842,"value_text":null,"unit":"d","err_plus":5.012e-06,"err_minus":5.012e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q16 KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.581477136,"value_text":null,"unit":"d","err_plus":5.485e-06,"err_minus":5.485e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.581501,"value_text":null,"unit":"d","err_plus":1.7e-05,"err_minus":1.7e-05,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q8 KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.581484,"value_text":null,"unit":"d","err_plus":8e-06,"err_minus":8e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Rowe et al. 2014","ref_year":2014},{"parameter":"orbital_period","value":6.581478842,"value_text":null,"unit":"d","err_plus":5.012e-06,"err_minus":5.012e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q12 KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.581477136,"value_text":null,"unit":"d","err_plus":5.485e-06,"err_minus":5.485e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 Supplemental KOI Table","ref_year":2014},{"parameter":"orbital_period","value":6.581478842,"value_text":null,"unit":"d","err_plus":5.012e-06,"err_minus":5.012e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR24 KOI Table","ref_year":2014},{"parameter":"radius","value":3.932,"value_text":null,"unit":"R_earth","err_plus":0.148,"err_minus":0.148,"band":null,"method":"Transit","source":"nasa-exo","reference":"Fulton & Petigura 2018","ref_year":2018},{"parameter":"radius","value":3.99,"value_text":null,"unit":"R_earth","err_plus":0.28,"err_minus":0.22,"band":null,"method":"Transit","source":"nasa-exo","reference":"Morton et al. 2016","ref_year":2016},{"parameter":"radius","value":5.41,"value_text":null,"unit":"R_earth","err_plus":2.72,"err_minus":2.72,"band":null,"method":"Transit","source":"nasa-exo","reference":"Rowe et al. 2014","ref_year":2014},{"parameter":"radius","value":4.56,"value_text":null,"unit":"R_earth","err_plus":1.56,"err_minus":0.72,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 KOI Table","ref_year":2014},{"parameter":"radius","value":4.77,"value_text":null,"unit":"R_earth","err_plus":3.47,"err_minus":0.69,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR24 KOI Table","ref_year":2014},{"parameter":"radius","value":4.77,"value_text":null,"unit":"R_earth","err_plus":3.47,"err_minus":0.69,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q16 KOI Table","ref_year":2014},{"parameter":"radius","value":4.77,"value_text":null,"unit":"R_earth","err_plus":3.47,"err_minus":0.69,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q12 KOI Table","ref_year":2014},{"parameter":"radius","value":3.4,"value_text":null,"unit":"R_earth","err_plus":3.8,"err_minus":3.8,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q8 KOI Table","ref_year":2014},{"parameter":"semi_major_axis","value":0.06677,"value_text":null,"unit":"au","err_plus":0.00041,"err_minus":0.00041,"band":null,"method":"Transit","source":"nasa-exo","reference":"Fulton & Petigura 2018","ref_year":2018},{"parameter":"semi_major_axis","value":0.0656,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR25 KOI Table","ref_year":2014},{"parameter":"semi_major_axis","value":0.0656,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q17 DR24 KOI Table","ref_year":2014},{"parameter":"semi_major_axis","value":0.066,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Rowe et al. 2014","ref_year":2014},{"parameter":"semi_major_axis","value":0.0656,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q16 KOI Table","ref_year":2014},{"parameter":"semi_major_axis","value":0.0656,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q12 KOI Table","ref_year":2014},{"parameter":"semi_major_axis","value":0.062,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Q1-Q8 KOI Table","ref_year":2014}],"orbit":null,"exoplanet":{"object_id":5917,"pl_name":"Kepler-257 c","hostname":"Kepler-257","sy_pnum":3,"disc_method":"Transit","disc_year":2014,"disc_facility":"Kepler","orbper_d":6.581484,"orbsmax_au":0.066,"rade":5.41,"radj":0.483,"masse":25.2,"massj":0.0794,"dens_gcm3":0.875,"eccen":0.0,"insol":88.6,"eqt_k":881.0,"st_teff":5180.0,"st_rad":1.037,"st_mass":0.916,"st_spectype":null,"sy_dist_pc":780.256,"updated_at":"2026-09-13T03:31:17.289698+00:00"},"sources":[]}