{"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":"2026-09-05T19:23:16.509Z","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":"kepler-223-c","name":"Kepler-223 c","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":298.51878,"epoch_dec_deg":47.348638,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-223","semi_major_axis_km":13638837.871718999,"periapsis_km":null,"mass_kg":3.045805612573603e+25,"mass_msun":0.0000153178,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-223-c","radius_km":21940.664,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-223","host_v_mag":15.69,"eccentricity":0.15,"uncertainties":{"mass_kg":[6.569384654570517e+24,1.0152685375245345e+25],"radius_km":[1913.43,1275.6200000000001],"distance_ly":[362.1803496355577,362.1803496355577],"eccentricity":[0.051,0.019],"host_mass_solar":[0.073,0.094],"host_radius_solar":[0.14,0.07],"host_temperature_k":[25,25],"semi_major_axis_km":[137630.04104399998,137630.04104399998],"orbital_period_days":[0.00051,0.00052]},"host_mass_solar":1.125,"inclination_deg":90,"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":9.84564,"transit_midpoint_bjd":2455700.1459,"equilibrium_temperature_k":947},"designations":[{"catalog":"Exoplanet","designation":"Kepler-223 c"}],"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."}