{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T15:52:22.777Z","years_from_j2000":26.681,"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":"kap-crb-b","name":"κ CrB b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":98.05924111691662,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":237.8080012,"dec_deg":35.6558818,"epoch_ra_deg":238.062296,"epoch_dec_deg":35.574539,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"κ CrB","semi_major_axis_km":373994676.75,"periapsis_km":null,"mass_kg":4.118951026121691e+27,"mass_msun":0.00207148,"constellation":"Corona Borealis","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/kap-crb-b","radius_km":84828.73000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"κ CrB","host_v_mag":4.79734,"eccentricity":0.04,"uncertainties":{"distance_ly":[0.32175326661756737,0.32175326661756737],"eccentricity":[0.032,0.013],"host_mass_solar":[0.25,0.24],"host_radius_solar":[0.71,0.84],"semi_major_axis_km":[1346380.8362999998,598391.4828],"orbital_period_days":[6.48,3.07],"argument_of_periastron_deg":[423.5,264.5]},"host_mass_solar":1.33,"inclination_deg":60,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.68,"planets_in_system":1,"discovery_facility":"Lick Observatory","host_spectral_type":"K0 III-IV","host_temperature_k":4840,"orbital_period_days":1253.68,"periastron_epoch_bjd":2451743.5,"equilibrium_temperature_k":319.32,"argument_of_periastron_deg":177.6},"designations":[{"catalog":"Exoplanet","designation":"kap CrB b"},{"catalog":"Host star","designation":"kap CrB"}],"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."}