{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-09-01T01:25:38.571Z","years_from_j2000":26.665,"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":"k2-237-b","name":"K2-237 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1027.376281988856,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":253.7688479,"dec_deg":-28.7105836,"epoch_ra_deg":254.191226,"epoch_dec_deg":-28.754059,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-237","semi_major_axis_km":5313716.367264,"periapsis_km":null,"mass_kg":2.5928382032557363e+27,"mass_msun":0.00130398,"constellation":"Ophiuchus","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-237-b","radius_km":102448.035697454,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-237","host_v_mag":11.602,"eccentricity":0.03,"uncertainties":{"mass_kg":[1.7462746315372963e+26,2.0879370597323927e+26],"radius_km":[3503.107962905,4003.5519940520007],"distance_ly":[22.53740570022697,23.551752034926043],"eccentricity":[0.021,0.033],"host_mass_solar":[0.062,0.055],"inclination_deg":[0.88,1],"host_radius_solar":[0.036,0.043],"host_temperature_k":[140,160],"semi_major_axis_km":[89758.72241999999,76294.914057],"orbital_period_days":[5.4e-7,5.4e-7],"argument_of_periastron_deg":[58,57]},"host_mass_solar":1.256,"inclination_deg":88.37,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.236,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"F9 V","host_temperature_k":6180,"orbital_period_days":2.18053332,"transit_midpoint_bjd":2457706.61618,"equilibrium_temperature_k":1759,"argument_of_periastron_deg":73},"designations":[{"catalog":"Exoplanet","designation":"K2-237 b"},{"catalog":"Host star","designation":"K2-237"}],"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":"2026-08-30T09:56:50.739Z","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."}