{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T02:55:08.864Z","years_from_j2000":26.688,"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":"tyc-2187-512-1-b","name":"TYC 2187-512-1 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":50.47074251339974,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":320.5266829,"dec_deg":22.9319351,"epoch_ra_deg":320.830015,"epoch_dec_deg":23.046198,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TYC 2187-512-1","semi_major_axis_km":182509402.25399998,"periapsis_km":null,"mass_kg":6.263811179197178e+26,"mass_msun":0.000315016,"constellation":"Pegasus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/tyc-2187-512-1-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TYC 2187-512-1","host_v_mag":10.58,"eccentricity":0.05,"uncertainties":{"mass_kg":[3.7962491995134414e+25,3.7962491995134414e+25],"distance_ly":[0.03799721800400061,0.03799721800400061],"eccentricity":[0.03,0.04],"host_mass_solar":[0.019,0.019],"host_radius_solar":[0.014,0.014],"host_temperature_k":[54,54],"semi_major_axis_km":[2991957.414,2991957.414],"orbital_period_days":[8.61,8.77],"argument_of_periastron_deg":[46.94,64.06]},"host_mass_solar":0.498,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.495,"planets_in_system":1,"discovery_facility":"Calar Alto Observatory","host_spectral_type":"M1.0 V","host_temperature_k":3734,"orbital_period_days":691.9,"periastron_epoch_bjd":2457558.647,"equilibrium_temperature_k":114.69,"argument_of_periastron_deg":3.71},"designations":[{"catalog":"Exoplanet","designation":"TYC 2187-512-1 b"},{"catalog":"Host star","designation":"TYC 2187-512-1"}],"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."}