{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T19:18:55.447Z","years_from_j2000":26.676,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-240237-b","name":"HD 240237 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3044.268613641208,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":348.9259334,"dec_deg":58.0432233,"epoch_ra_deg":349.220874,"epoch_dec_deg":58.189597,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 240237","semi_major_axis_km":287227911.74399996,"periapsis_km":null,"mass_kg":3.0161351062245927e+28,"mass_msun":0.0151686,"constellation":"Cassiopeia","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/hd-240237-b","radius_km":77812.82,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 240237","host_v_mag":8.19,"eccentricity":0.4,"uncertainties":{"mass_kg":[1.0591588352884348e+28,1.0591588352884348e+28],"distance_ly":[104.33253288592046,104.33253288592046],"eccentricity":[0.1,0.1],"host_mass_solar":[4.21,4.21],"host_radius_solar":[17.07,17.07],"host_temperature_k":[100,100],"semi_major_axis_km":[23935659.312,23935659.312],"orbital_period_days":[14,14],"argument_of_periastron_deg":[21.8,21.8]},"host_mass_solar":8.76,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":71.23,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K2 III","host_temperature_k":3926,"orbital_period_days":745.70001,"periastron_epoch_bjd":2454292.5,"equilibrium_temperature_k":1153.09,"argument_of_periastron_deg":108.1},"designations":[{"catalog":"Exoplanet","designation":"HD 240237 b"},{"catalog":"Host star","designation":"HD 240237"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}