{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T08:08:35.959Z","years_from_j2000":26.685,"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-23472-d","name":"HD 23472 d","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":127.31220663433135,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":55.4590314,"dec_deg":-62.7672667,"epoch_ra_deg":55.566717,"epoch_dec_deg":-62.680658,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 23472","semi_major_axis_km":6429716.482685999,"periapsis_km":null,"mass_kg":3.2846923272852586e+24,"mass_msun":0.00000165192,"constellation":"Reticulum","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-23472-d","radius_km":4783.575000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 23472","host_v_mag":9.73,"eccentricity":0.07,"uncertainties":{"mass_kg":[1.1944335735582758e+24,1.2541552522361896e+24],"radius_km":[363.55170000000004,427.33270000000005],"distance_ly":[0.13046255108669738,0.1307887074644141],"eccentricity":[0.047,0.05],"host_mass_solar":[0.03,0.03],"inclination_deg":[0.87,1.2],"host_radius_solar":[0.02,0.02],"host_temperature_k":[99,99],"semi_major_axis_km":[97238.61595499999,94246.658541],"orbital_period_days":[0.000044,0.00003],"argument_of_periastron_deg":[117,99]},"host_mass_solar":0.67,"inclination_deg":87.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.71,"planets_in_system":5,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K4 V","host_temperature_k":4684,"orbital_period_days":3.97664,"transit_midpoint_bjd":2458357.8398,"equilibrium_temperature_k":909,"argument_of_periastron_deg":19},"designations":[{"catalog":"Exoplanet","designation":"HD 23472 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."}