{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:19:10.182Z","years_from_j2000":26.684,"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":"hd-224018-d","name":"HD 224018 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":344.02974721562094,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":358.6390056,"dec_deg":-4.7233362,"epoch_ra_deg":358.983719,"epoch_dec_deg":-4.573829,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 224018","semi_major_axis_km":79286871.471,"periapsis_km":null,"mass_kg":2.5083105044723793e+25,"mass_msun":0.0000126147,"constellation":"Aquarius","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/hd-224018-d","radius_km":15307.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 224018","host_v_mag":9.715,"eccentricity":0.04,"uncertainties":{"mass_kg":[9.555468588466207e+24,1.0749902162024483e+25],"radius_km":[637.8100000000001,637.8100000000001],"distance_ly":[2.11023176382733,2.1363242740446693],"eccentricity":[0.04,0.05],"host_mass_solar":[0.061,0.069],"inclination_deg":[0.1,0.1],"host_radius_solar":[0.028,0.028],"host_temperature_k":[60,60],"semi_major_axis_km":[2991957.414,8975872.241999999],"orbital_period_days":[0.005,27.6127],"argument_of_periastron_deg":[140,97]},"host_mass_solar":1.013,"inclination_deg":89.9,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.147,"planets_in_system":3,"discovery_facility":"K2","host_spectral_type":"G V","host_temperature_k":5784,"orbital_period_days":138.0731,"transit_midpoint_bjd":2457741.745,"equilibrium_temperature_k":411,"argument_of_periastron_deg":206},"designations":[{"catalog":"Exoplanet","designation":"HD 224018 d"},{"catalog":"Host star","designation":"HD 224018"}],"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."}