{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:07:10.533Z","years_from_j2000":26.68,"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-216770-b","name":"HD 216770 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":119.57708198040106,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":343.9748751,"dec_deg":-26.6595286,"epoch_ra_deg":344.340605,"epoch_dec_deg":-26.516282,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 216770","semi_major_axis_km":68815020.522,"periapsis_km":null,"mass_kg":1.0819364446494763e+27,"mass_msun":0.000544121,"constellation":"Piscis Austrinus","discovered":"2003","featured":false,"url":"https://spacecatalog.org/object/hd-216770-b","radius_km":89931.21,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 216770","host_v_mag":8.11,"eccentricity":0.37,"uncertainties":{"mass_kg":[9.490670567100671e+25,9.490670567100671e+25],"distance_ly":[0.3193070937846918,0.32093787567327553],"eccentricity":[0.06,0.06],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.02,0.02],"host_temperature_k":[18,18],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[0.55,0.55],"argument_of_periastron_deg":[10,10]},"host_mass_solar":0.74,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.93,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G9 V CN+1","host_temperature_k":5399,"orbital_period_days":118.45,"periastron_epoch_bjd":2452672,"equilibrium_temperature_k":370.18,"argument_of_periastron_deg":281},"designations":[{"catalog":"Exoplanet","designation":"HD 216770 b"},{"catalog":"Host star","designation":"HD 216770"}],"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."}