{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T00:22:06.490Z","years_from_j2000":26.676,"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-211403-b","name":"HD 211403 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":271.00953121601873,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":333.8158177,"dec_deg":58.2755601,"epoch_ra_deg":334.05005,"epoch_dec_deg":58.408868,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 211403","semi_major_axis_km":114891164.69759999,"periapsis_km":null,"mass_kg":1.0515610282652233e+28,"mass_msun":0.00528845,"constellation":"Cepheus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-211403-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 211403","host_v_mag":8.48,"eccentricity":0.084,"uncertainties":{"mass_kg":[7.212873479075538e+26,7.40268593905121e+26],"distance_ly":[0.7700552077892312,0.7746213970772656],"eccentricity":[0.044,0.057],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.08,0.08],"host_temperature_k":[44,44],"semi_major_axis_km":[1944772.3190999997,1944772.3190999997],"orbital_period_days":[0.41,0.41],"argument_of_periastron_deg":[57,51]},"host_mass_solar":1.2,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.206,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"F7 V","host_temperature_k":6273,"orbital_period_days":223.8,"periastron_epoch_bjd":2455929,"equilibrium_temperature_k":380,"argument_of_periastron_deg":190},"designations":[{"catalog":"Exoplanet","designation":"HD 211403 b"},{"catalog":"Host star","designation":"HD 211403"}],"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."}