{"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":"2026-09-06T16:47:32.216Z","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":"kepler-223-d","name":"Kepler-223 d","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":6065.562772036049,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.3183909,"dec_deg":47.2794824,"epoch_ra_deg":298.518806,"epoch_dec_deg":47.348643,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-223","semi_major_axis_km":17885921.420892,"periapsis_km":null,"mass_kg":4.777734294233103e+25,"mass_msun":0.0000240279,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-223-d","radius_km":33421.244000000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-223","host_v_mag":15.69,"eccentricity":0.037,"uncertainties":{"mass_kg":[7.763818228128793e+24,8.958251801687069e+24],"radius_km":[2870.1450000000004,1658.306],"distance_ly":[362.1803496355577,362.1803496355577],"eccentricity":[0.017,0.018],"host_mass_solar":[0.073,0.094],"inclination_deg":[0.26,0.32],"host_radius_solar":[0.14,0.07],"host_temperature_k":[25,25],"semi_major_axis_km":[181013.42354699998,181013.42354699998],"orbital_period_days":[0.00027,0.0003]},"host_mass_solar":1.125,"inclination_deg":87.94,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.72,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":5803,"orbital_period_days":14.78869,"transit_midpoint_bjd":2455704.8504,"equilibrium_temperature_k":827},"designations":[{"catalog":"Exoplanet","designation":"Kepler-223 d"}],"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."}