{"id":8622,"slug":"xo-4-b","name":"XO-4 b","domain":"exoplanet","class":"exoplanet","otype":"Pl","otype_label":"Planet","ra":110.3880285,"dec":58.2681094,"coo_err_mas":0.0118,"coo_bibcode":"2020yCat.1350....0G","plx_mas":3.7812,"pmra":-17.008,"pmdec":5.463,"rv_kms":null,"redshift":null,"dist_pc":272.655,"vmag":10.814,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":79,"simbad_oid":4696758,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":"XO-4 b","host_object_id":1661940,"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":["XO-4b"],"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":"Stassun et al. 2017","ref_year":2017},{"parameter":"eccentricity","value":0.0039,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bonomo et al. 2017","ref_year":2017},{"parameter":"eccentricity","value":0.002,"value_text":null,"unit":null,"err_plus":0.012,"err_minus":0.002,"band":null,"method":"Transit","source":"nasa-exo","reference":"Knutson et al. 2014","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":"Narita et al. 2010","ref_year":2010},{"parameter":"equilibrium_temperature","value":1630.0,"value_text":null,"unit":"K","err_plus":170.0,"err_minus":40.0,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2011","ref_year":2011},{"parameter":"equilibrium_temperature","value":1608.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2010},{"parameter":"equilibrium_temperature","value":1630.0,"value_text":null,"unit":"K","err_plus":169.0,"err_minus":36.0,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2010","ref_year":2010},{"parameter":"mass","value":451.3186,"value_text":null,"unit":"M_earth","err_plus":60.3877,"err_minus":60.3877,"band":null,"method":"Transit","source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"mass","value":512.34196,"value_text":null,"unit":"M_earth","err_plus":8.58141,"err_minus":8.89924,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bonomo et al. 2017","ref_year":2017},{"parameter":"mass","value":495.49697,"value_text":null,"unit":"M_earth","err_plus":16.52716,"err_minus":15.25584,"band":null,"method":"Transit","source":"nasa-exo","reference":"Knutson et al. 2014","ref_year":2014},{"parameter":"mass","value":491.68301,"value_text":null,"unit":"M_earth","err_plus":35.27913,"err_minus":21.61244,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2011","ref_year":2011},{"parameter":"mass","value":565.71,"value_text":null,"unit":"M_earth","err_plus":25.43,"err_minus":25.43,"band":null,"method":"Transit","source":"nasa-exo","reference":"Narita et al. 2010","ref_year":2010},{"parameter":"mass","value":483.41943,"value_text":null,"unit":"M_earth","err_plus":50.8528,"err_minus":48.94582,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2010","ref_year":2010},{"parameter":"orbital_period","value":4.12506679,"value_text":null,"unit":"d","err_plus":4.8e-07,"err_minus":4.8e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Kokori et al. 2023","ref_year":2023},{"parameter":"orbital_period","value":4.1250679,"value_text":null,"unit":"d","err_plus":6e-07,"err_minus":6e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Kokori et al. 2022","ref_year":2022},{"parameter":"orbital_period","value":4.1250672,"value_text":null,"unit":"d","err_plus":2e-06,"err_minus":2e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Ivshina &amp; Winn 2022","ref_year":2022},{"parameter":"orbital_period","value":4.1250823,"value_text":null,"unit":"d","err_plus":3.9e-06,"err_minus":3.9e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bonomo et al. 2017","ref_year":2017},{"parameter":"orbital_period","value":4.12508,"value_text":null,"unit":"d","err_plus":4e-06,"err_minus":4e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"orbital_period","value":4.1250828,"value_text":null,"unit":"d","err_plus":4e-06,"err_minus":4e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2011","ref_year":2011},{"parameter":"orbital_period","value":4.12502,"value_text":null,"unit":"d","err_plus":2e-05,"err_minus":2e-05,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2010","ref_year":2010},{"parameter":"orbital_period","value":4.1250828,"value_text":null,"unit":"d","err_plus":4e-06,"err_minus":4e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"Narita et al. 2010","ref_year":2010},{"parameter":"orbital_period","value":4.1250429,"value_text":null,"unit":"d","err_plus":9.3e-06,"err_minus":9.3e-06,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2010},{"parameter":"radius","value":14.01125,"value_text":null,"unit":"R_earth","err_plus":0.89672,"err_minus":0.89672,"band":null,"method":"Transit","source":"nasa-exo","reference":"Stassun et al. 2017","ref_year":2017},{"parameter":"radius","value":15.02006,"value_text":null,"unit":"R_earth","err_plus":0.56045,"err_minus":0.56045,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bonomo et al. 2017","ref_year":2017},{"parameter":"radius","value":14.425983,"value_text":null,"unit":"R_earth","err_plus":4.315465,"err_minus":0.706167,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2011","ref_year":2011},{"parameter":"radius","value":14.91,"value_text":null,"unit":"R_earth","err_plus":0.56,"err_minus":0.56,"band":null,"method":"Transit","source":"nasa-exo","reference":"Narita et al. 2010","ref_year":2010},{"parameter":"radius","value":14.45961,"value_text":null,"unit":"R_earth","err_plus":4.25942,"err_minus":0.67254,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2010","ref_year":2010},{"parameter":"radius","value":15.3479,"value_text":null,"unit":"R_earth","err_plus":0.884007,"err_minus":0.884007,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2010},{"parameter":"semi_major_axis","value":0.05524,"value_text":null,"unit":"au","err_plus":0.00027,"err_minus":0.00028,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bonomo et al. 2017","ref_year":2017},{"parameter":"semi_major_axis","value":0.05474,"value_text":null,"unit":"au","err_plus":0.00163,"err_minus":0.00064,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2011","ref_year":2011},{"parameter":"semi_major_axis","value":0.05475,"value_text":null,"unit":"au","err_plus":0.00097,"err_minus":0.00062,"band":null,"method":"Transit","source":"nasa-exo","reference":"Southworth 2010","ref_year":2010}],"orbit":null,"exoplanet":{"object_id":8622,"pl_name":"XO-4 b","hostname":"XO-4","sy_pnum":1,"disc_method":"Transit","disc_year":2010,"disc_facility":"Lowell Observatory","orbper_d":4.12508,"orbsmax_au":0.05524,"rade":14.01125,"radj":1.25,"masse":451.3186,"massj":1.42,"dens_gcm3":0.83,"eccen":0.0,"insol":1112.27,"eqt_k":1630.0,"st_teff":6397.0,"st_rad":1.45,"st_mass":1.1,"st_spectype":"F5 V","sy_dist_pc":272.655,"updated_at":"2026-09-13T03:31:17.289698+00:00"},"sources":[]}