{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T10:55:40.849Z","years_from_j2000":26.686,"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-211970-b","name":"HD 211970 b","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":42.81683079752093,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":335.5661579,"dec_deg":-54.5596006,"epoch_ra_deg":335.999411,"epoch_dec_deg":-54.424118,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 211970","semi_major_axis_km":21392495.510099996,"periapsis_km":null,"mass_kg":7.763818228128793e+25,"mass_msun":0.0000390454,"constellation":"Grus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-211970-b","radius_km":23343.846,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 211970","host_v_mag":10.24,"eccentricity":0.15,"uncertainties":{"mass_kg":[1.4930419669478448e+25,1.4930419669478448e+25],"distance_ly":[0.02283094644017204,0.022504790062455295],"eccentricity":[0.1,0.1],"host_mass_solar":[0.04,0.04],"host_radius_solar":[0.039235,0.027151],"host_temperature_k":[94,149],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.025,0.025],"argument_of_periastron_deg":[51.73,51.73]},"host_mass_solar":0.61,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.574175,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"K7 V","host_temperature_k":4127,"orbital_period_days":25.201,"equilibrium_temperature_k":398.77,"argument_of_periastron_deg":97.83},"designations":[{"catalog":"Exoplanet","designation":"HD 211970 b"},{"catalog":"Host star","designation":"HD 211970"}],"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."}