{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T06:28:21.695Z","years_from_j2000":26.682,"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-756-c","name":"TOI-756 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":281.0681939048031,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":192.103738,"dec_deg":-45.4704709,"epoch_ra_deg":192.478145,"epoch_dec_deg":-45.617107,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-756","semi_major_axis_km":65673465.23729999,"periapsis_km":null,"mass_kg":7.687404629014718e+27,"mass_msun":0.00386611,"constellation":"Centaurus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-756-c","radius_km":82915.3,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-756","host_v_mag":14.607,"eccentricity":0.445,"uncertainties":{"mass_kg":[2.0879370597323927e+26,2.0879370597323927e+26],"distance_ly":[1.0195648367425398,1.0264141206745914],"eccentricity":[0.008,0.008],"host_mass_solar":[0.019,0.019],"host_radius_solar":[0.015,0.015],"host_temperature_k":[72,72],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.16,0.16],"argument_of_periastron_deg":[0.93,0.99]},"host_mass_solar":0.505,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.505,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"M1 V","host_temperature_k":3657,"orbital_period_days":149.4,"transit_midpoint_bjd":2460498.882,"equilibrium_temperature_k":194,"argument_of_periastron_deg":-167.77},"designations":[{"catalog":"Exoplanet","designation":"TOI-756 c"}],"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."}