{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:24:13.428Z","years_from_j2000":26.675,"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":"kepler-450-b","name":"Kepler-450 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1487.2143742403612,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":295.4865821,"dec_deg":51.0135237,"epoch_ra_deg":295.662648,"epoch_dec_deg":51.075999,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-450","semi_major_axis_km":30057204.181043997,"periapsis_km":null,"mass_kg":1.1586005663515275e+26,"mass_msun":0.0000582677,"constellation":"Cygnus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kepler-450-b","radius_km":39161.534,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-450","host_v_mag":11.991,"eccentricity":0.02,"uncertainties":{"mass_kg":[4.061074150098138e+25,6.629106333248431e+25],"radius_km":[2104.773,2104.773],"distance_ly":[16.54917460534756,16.924254439721818],"eccentricity":[0.02,0.14],"host_mass_solar":[0.142064,0.197747],"host_radius_solar":[0.106909,0.080191],"host_temperature_k":[187.39,130.15],"semi_major_axis_km":[169045.59389099997,169045.59389099997],"orbital_period_days":[0.000025,0.000025]},"host_mass_solar":1.19,"inclination_deg":88.82,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.64162,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":6197.21,"orbital_period_days":28.454851,"transit_midpoint_bjd":2455009.70618,"equilibrium_temperature_k":769},"designations":[{"catalog":"Exoplanet","designation":"Kepler-450 b"}],"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."}