{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T13:31:07.347Z","years_from_j2000":26.681,"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-757-b","name":"TOI-757 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":196.80862912908188,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":187.9948428,"dec_deg":-35.5544523,"epoch_ra_deg":188.352665,"epoch_dec_deg":-35.702818,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-757","semi_major_axis_km":18250940.225399997,"periapsis_km":null,"mass_kg":6.270776261180948e+25,"mass_msun":0.0000315366,"constellation":"Centaurus","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-757-b","radius_km":15945.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-757","host_v_mag":9.743,"eccentricity":0.39,"uncertainties":{"mass_kg":[1.2541552522361896e+25,1.3138769309141034e+25],"radius_km":[637.8100000000001,637.8100000000001],"distance_ly":[0.6532912245666371,0.6578574138546714],"eccentricity":[0.07,0.08],"host_mass_solar":[0.05,0.05],"inclination_deg":[0.3,0.4],"host_radius_solar":[0.03,0.03],"host_temperature_k":[63,63],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.00002,0.00002],"argument_of_periastron_deg":[10,14]},"host_mass_solar":0.8,"inclination_deg":89.5,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.78,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K0 V","host_temperature_k":5278,"orbital_period_days":17.46819,"transit_midpoint_bjd":2459305.5322,"equilibrium_temperature_k":641,"argument_of_periastron_deg":-36},"designations":[{"catalog":"Exoplanet","designation":"TOI-757 b"},{"catalog":"Host star","designation":"TOI-757"}],"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."}