{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T14:52:21.025Z","years_from_j2000":26.678,"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-16-b","name":"KELT-16 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1450.045593435761,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":314.2685227,"dec_deg":31.6610186,"epoch_ra_deg":314.545682,"epoch_dec_deg":31.764023,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KELT-16","semi_major_axis_km":3057780.477108,"periapsis_km":null,"mass_kg":5.219868811905369e+27,"mass_msun":0.00262515,"constellation":"Cygnus","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/kelt-16-b","radius_km":101161.3539035,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KELT-16","host_v_mag":11.717,"eccentricity":0,"uncertainties":{"mass_kg":[2.8472011701302012e+26,3.0370145814722146e+26],"radius_km":[4789.9722343,6005.3383236],"distance_ly":[17.74616851156801,18.17995649393128],"host_mass_solar":[0.046,0.043],"inclination_deg":[2.3,3],"host_radius_solar":[0.053,0.064],"host_temperature_k":[54,54],"semi_major_axis_km":[38895.446381999995,35903.488968],"orbital_period_days":[0.0000024,0.0000024]},"host_mass_solar":1.211,"inclination_deg":84.4,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.36,"planets_in_system":1,"discovery_facility":"KELT","host_spectral_type":"F7 V","host_temperature_k":6236,"orbital_period_days":0.9689951,"transit_midpoint_bjd":2457247.24791,"equilibrium_temperature_k":2453},"designations":[{"catalog":"Exoplanet","designation":"KELT-16 b"},{"catalog":"Host star","designation":"KELT-16"}],"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."}