{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T23:37:17.842Z","years_from_j2000":26.673,"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-418-c","name":"Kepler-418 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":3269.815533523668,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.4335228,"dec_deg":38.3554729,"epoch_ra_deg":294.669117,"epoch_dec_deg":38.415506,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-418","semi_major_axis_km":15905245.612823999,"periapsis_km":null,"mass_kg":1.4154037846665569e+26,"mass_msun":0.0000711827,"constellation":"Cygnus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kepler-418-c","radius_km":33300.612060774,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-418","host_v_mag":14.824,"eccentricity":0,"uncertainties":{"distance_ly":[64.31151455818747,66.92728870747575],"host_mass_solar":[0.056,0.078],"host_radius_solar":[0.132,0.162],"host_temperature_k":[116,105],"semi_major_axis_km":[178021.466133,178021.466133]},"host_mass_solar":0.957,"inclination_deg":88.15,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.081,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5822,"orbital_period_days":12.21829987,"transit_midpoint_bjd":2454973.321095,"equilibrium_temperature_k":835},"designations":[{"catalog":"Exoplanet","designation":"Kepler-418 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."}