{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T21:56:43.338Z","years_from_j2000":26.687,"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-21411-b","name":"HD 21411 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":95.01848520746343,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":51.5474155,"dec_deg":-30.6168403,"epoch_ra_deg":51.823238,"epoch_dec_deg":-30.52227,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 21411","semi_major_axis_km":54154429.193399996,"periapsis_km":null,"mass_kg":3.935658624874519e+26,"mass_msun":0.00019793,"constellation":"Fornax","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-21411-b","radius_km":60719.512,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 21411","host_v_mag":7.88,"eccentricity":0.4,"uncertainties":{"mass_kg":[1.528874974154593e+26,1.528874974154593e+26],"distance_ly":[0.10176078984762395,0.10176078984762395],"eccentricity":[0.15,0.15],"host_mass_solar":[0.05,0.05],"host_radius_solar":[0.03965,0.036014],"host_temperature_k":[132,247],"semi_major_axis_km":[1047185.0948999999,1047185.0948999999],"orbital_period_days":[0.127,0.127],"argument_of_periastron_deg":[17.74,17.74]},"host_mass_solar":0.89,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.825605,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"G8 V","host_temperature_k":5605,"orbital_period_days":84.288,"equilibrium_temperature_k":408.17,"argument_of_periastron_deg":332.42},"designations":[{"catalog":"Exoplanet","designation":"HD 21411 b"},{"catalog":"Host star","designation":"HD 21411"}],"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."}