{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:05:35.606Z","years_from_j2000":26.687,"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":"kelt-17-b","name":"KELT-17 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":738.7441955284238,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":125.617407,"dec_deg":13.7353093,"epoch_ra_deg":125.991601,"epoch_dec_deg":13.649669,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KELT-17","semi_major_axis_km":7301872.068866999,"periapsis_km":null,"mass_kg":2.4865556885803757e+27,"mass_msun":0.00125052,"constellation":"Cancer","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kelt-17-b","radius_km":109025.4874225,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KELT-17","host_v_mag":9.234,"uncertainties":{"mass_kg":[5.504588928918389e+26,5.314775517576376e+26],"radius_km":[4289.527374,4646.987988500001],"distance_ly":[8.000615945391715,8.17347882558159],"host_mass_solar":[0.061,0.066],"inclination_deg":[0.43,0.45],"host_radius_solar":[0.055,0.06],"host_temperature_k":[49,49],"semi_major_axis_km":[91254.701127,97238.61595499999],"orbital_period_days":[0.0000052,0.0000053]},"host_mass_solar":1.635,"inclination_deg":84.87,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.645,"planets_in_system":1,"discovery_facility":"KELT","host_spectral_type":"A","host_temperature_k":7454,"orbital_period_days":3.0801716,"transit_midpoint_bjd":2457226.142194,"equilibrium_temperature_k":2087},"designations":[{"catalog":"Exoplanet","designation":"KELT-17 b"},{"catalog":"Host star","designation":"KELT-17"}],"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."}