{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T06:19:21.087Z","years_from_j2000":26.677,"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":"toi-4666-b","name":"TOI-4666 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":504.72373295288327,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":56.2898862,"dec_deg":-39.0631799,"epoch_ra_deg":56.534107,"epoch_dec_deg":-38.978552,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4666","semi_major_axis_km":5086327.6038,"periapsis_km":null,"mass_kg":9.281829292631198e+26,"mass_msun":0.000466797,"constellation":"Eridanus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-4666-b","radius_km":79928.055762802,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4666","host_v_mag":15.333,"eccentricity":0.023,"uncertainties":{"mass_kg":[1.2527622357199922e+26,1.2717434818967246e+26],"radius_km":[2502.2199643920003,2502.2199643920003],"distance_ly":[1.7677675672247495,1.7840753861105867],"eccentricity":[0.016,0.033],"host_mass_solar":[0.012,0.012],"inclination_deg":[0.19,0.14],"host_radius_solar":[0.018,0.018],"host_temperature_k":[80,80],"semi_major_axis_km":[164557.65777,164557.65777],"orbital_period_days":[0.000007,0.000007],"argument_of_periastron_deg":[49,50]},"host_mass_solar":0.576,"inclination_deg":89.79,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.585,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M2±0.5","host_temperature_k":3793,"orbital_period_days":2.9089165,"transit_midpoint_bjd":2460265.13619,"equilibrium_temperature_k":695,"argument_of_periastron_deg":183},"designations":[{"catalog":"Exoplanet","designation":"TOI-4666 b"},{"catalog":"Host star","designation":"TOI-4666"}],"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."}