{"id":10699,"slug":"wasp-121-b","name":"WASP-121 b","domain":"exoplanet","class":"exoplanet","otype":null,"otype_label":"Exoplanet","ra":107.6002312,"dec":-39.0972705,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":269.898,"vmag":10.514,"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":null,"ned_name":null,"exo_name":"WASP-121 b","host_object_id":10698,"depth":0,"deep_at":null,"views":10,"first_seen":"2026-08-14T16:25:51.971135+00:00","updated_at":"2026-09-13T03:31:17.289698+00:00","identifiers":[],"measurements":[{"parameter":"eccentricity","value":0.0085,"value_text":null,"unit":null,"err_plus":0.0013,"err_minus":0.0012,"band":null,"method":"Transit","source":"nasa-exo","reference":"Pelletier et al. 2026","ref_year":2026},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bourrier et al. 2020","ref_year":2020},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Evans et al. 2017","ref_year":2017},{"parameter":"eccentricity","value":0.0,"value_text":null,"unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016},{"parameter":"equilibrium_temperature","value":2409.0,"value_text":null,"unit":"K","err_plus":24.0,"err_minus":24.0,"band":null,"method":"Transit","source":"nasa-exo","reference":"Sing et al. 2024","ref_year":2024},{"parameter":"equilibrium_temperature","value":2720.0,"value_text":null,"unit":"K","err_plus":8.0,"err_minus":8.0,"band":null,"method":"Transit","source":"nasa-exo","reference":"Mikal-Evans et al. 2019","ref_year":2019},{"parameter":"equilibrium_temperature","value":2358.0,"value_text":null,"unit":"K","err_plus":52.0,"err_minus":52.0,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016},{"parameter":"equilibrium_temperature","value":2473.0,"value_text":null,"unit":"K","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2016},{"parameter":"mass","value":371.85923619,"value_text":null,"unit":"M_earth","err_plus":13.6666215,"err_minus":13.6666215,"band":null,"method":"Transit","source":"nasa-exo","reference":"Sing et al. 2024","ref_year":2024},{"parameter":"mass","value":367.7274669,"value_text":null,"unit":"M_earth","err_plus":22.24798849,"err_minus":22.24798849,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bourrier et al. 2020","ref_year":2020},{"parameter":"mass","value":375.99289,"value_text":null,"unit":"M_earth","err_plus":20.34112,"err_minus":19.70546,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016},{"parameter":"orbital_period","value":1.27492504,"value_text":null,"unit":"d","err_plus":1.5e-07,"err_minus":1.5e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Sing et al. 2024","ref_year":2024},{"parameter":"orbital_period","value":1.274924762,"value_text":null,"unit":"d","err_plus":4.6e-08,"err_minus":4.6e-08,"band":null,"method":"Transit","source":"nasa-exo","reference":"Kokori et al. 2023","ref_year":2023},{"parameter":"orbital_period","value":1.274925,"value_text":null,"unit":"d","err_plus":1e-07,"err_minus":1e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Patel &amp; Espinoza 2022","ref_year":2022},{"parameter":"orbital_period","value":1.27492483,"value_text":null,"unit":"d","err_plus":1.1e-07,"err_minus":1.1e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Ivshina &amp; Winn 2022","ref_year":2022},{"parameter":"orbital_period","value":1.27492477,"value_text":null,"unit":"d","err_plus":1.2e-07,"err_minus":1.2e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Kokori et al. 2022","ref_year":2022},{"parameter":"orbital_period","value":1.27492504,"value_text":null,"unit":"d","err_plus":1.5e-07,"err_minus":1.4e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bourrier et al. 2020","ref_year":2020},{"parameter":"orbital_period","value":1.2749255,"value_text":null,"unit":"d","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Mikal-Evans et al. 2019","ref_year":2019},{"parameter":"orbital_period","value":1.2749255,"value_text":null,"unit":"d","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Evans et al. 2017","ref_year":2017},{"parameter":"orbital_period","value":1.2749255,"value_text":null,"unit":"d","err_plus":2e-07,"err_minus":2.5e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016},{"parameter":"orbital_period","value":1.2749246,"value_text":null,"unit":"d","err_plus":3e-07,"err_minus":3e-07,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2016},{"parameter":"radius","value":19.52604438,"value_text":null,"unit":"R_earth","err_plus":0.06725388,"err_minus":0.06725388,"band":null,"method":"Transit","source":"nasa-exo","reference":"Sing et al. 2024","ref_year":2024},{"parameter":"radius","value":19.64934317,"value_text":null,"unit":"R_earth","err_plus":0.40352331,"err_minus":0.40352331,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bourrier et al. 2020","ref_year":2020},{"parameter":"radius","value":20.1762,"value_text":null,"unit":"R_earth","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Mikal-Evans et al. 2019","ref_year":2019},{"parameter":"radius","value":18.988046,"value_text":null,"unit":"R_earth","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Evans et al. 2017","ref_year":2017},{"parameter":"radius","value":20.904785,"value_text":null,"unit":"R_earth","err_plus":0.493196,"err_minus":0.493196,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016},{"parameter":"radius","value":22.0328,"value_text":null,"unit":"R_earth","err_plus":0.876995,"err_minus":0.876995,"band":null,"method":"Transit","source":"nasa-exo","reference":"ExoFOP","ref_year":2016},{"parameter":"semi_major_axis","value":0.02571,"value_text":null,"unit":"au","err_plus":0.0001,"err_minus":0.0001,"band":null,"method":"Transit","source":"nasa-exo","reference":"Sing et al. 2024","ref_year":2024},{"parameter":"semi_major_axis","value":0.02596,"value_text":null,"unit":"au","err_plus":0.00043,"err_minus":0.00063,"band":null,"method":"Transit","source":"nasa-exo","reference":"Bourrier et al. 2020","ref_year":2020},{"parameter":"semi_major_axis","value":0.025,"value_text":null,"unit":"au","err_plus":null,"err_minus":null,"band":null,"method":"Transit","source":"nasa-exo","reference":"Mikal-Evans et al. 2019","ref_year":2019},{"parameter":"semi_major_axis","value":0.02544,"value_text":null,"unit":"au","err_plus":0.00049,"err_minus":0.0005,"band":null,"method":"Transit","source":"nasa-exo","reference":"Delrez et al. 2016","ref_year":2016}],"orbit":null,"exoplanet":{"object_id":10699,"pl_name":"WASP-121 b","hostname":"WASP-121","sy_pnum":1,"disc_method":"Transit","disc_year":2016,"disc_facility":"SuperWASP","orbper_d":1.27492504,"orbsmax_au":0.02571,"rade":19.52604438,"radj":1.742,"masse":371.85923619,"massj":1.17,"dens_gcm3":0.275,"eccen":0.0085,"insol":6216.41,"eqt_k":2409.0,"st_teff":6628.0,"st_rad":1.461,"st_mass":1.33,"st_spectype":"F6 V","sy_dist_pc":269.898,"updated_at":"2026-09-13T03:31:17.289698+00:00"},"sources":[]}