{"id":2285,"slug":"bd-20-2457-c","name":"BD+20 2457 c","domain":"exoplanet","class":"exoplanet","otype":null,"otype_label":"Exoplanet","ra":154.186782,"dec":19.8912626,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":1539.71,"vmag":9.743,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":20,"simbad_oid":4995606,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":"BD+20 2457 c","host_object_id":1950710,"depth":0,"deep_at":null,"views":6,"first_seen":"2026-08-14T16:25:51.971135+00:00","updated_at":"2026-09-13T03:31:17.289698+00:00","identifiers":["BD+20 2457c"],"measurements":[{"parameter":"eccentricity","value":0.18,"value_text":null,"unit":null,"err_plus":0.06,"err_minus":0.06,"band":null,"method":"Radial Velocity","source":"nasa-exo","reference":"Niedzielski et al. 2009","ref_year":2009},{"parameter":"mass","value":3963.17,"value_text":null,"unit":"M_earth","err_plus":null,"err_minus":null,"band":null,"method":"Radial Velocity","source":"nasa-exo","reference":"Niedzielski et al. 2009","ref_year":2009},{"parameter":"orbital_period","value":621.99,"value_text":null,"unit":"d","err_plus":10.2,"err_minus":10.2,"band":null,"method":"Radial Velocity","source":"nasa-exo","reference":"Niedzielski et al. 2009","ref_year":2009},{"parameter":"semi_major_axis","value":2.01,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Radial Velocity","source":"nasa-exo","reference":"Niedzielski et al. 2009","ref_year":2009}],"orbit":null,"exoplanet":{"object_id":2285,"pl_name":"BD+20 2457 c","hostname":"BD+20 2457","sy_pnum":2,"disc_method":"Radial Velocity","disc_year":2009,"disc_facility":"McDonald Observatory","orbper_d":621.99,"orbsmax_au":2.01,"rade":12.4,"radj":1.1,"masse":3963.17,"massj":12.47,"dens_gcm3":11.4,"eccen":0.18,"insol":366.1069,"eqt_k":984.96,"st_teff":4137.0,"st_rad":49.0,"st_mass":2.8,"st_spectype":"K2 II","sy_dist_pc":1539.71,"updated_at":"2026-09-13T03:31:17.289698+00:00"},"sources":[]}