{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:09:14.452Z","years_from_j2000":26.683,"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-954-b","name":"TOI-954 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":778.757059946714,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":61.9410587,"dec_deg":-25.2088028,"epoch_ra_deg":62.223695,"epoch_dec_deg":-25.136739,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-954","semi_major_axis_km":7424542.322841,"periapsis_km":null,"mass_kg":3.3027533573510334e+26,"mass_msun":0.0001661,"constellation":"Eridanus","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/toi-954-b","radius_km":60911.2887108,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-954","host_v_mag":10.343,"eccentricity":0.14,"uncertainties":{"mass_kg":[3.226827992814228e+25,3.416641404156241e+25],"radius_km":[4432.5116198,3789.0825137],"distance_ly":[6.115432082188939,6.213278995503962],"eccentricity":[0.11,0.18],"host_mass_solar":[0.064,0.066],"inclination_deg":[0.6,2.5],"host_radius_solar":[0.076,0.077],"host_temperature_k":[49,53],"semi_major_axis_km":[134638.08362999998,133142.10492299998],"orbital_period_days":[0.0000028,0.0000027],"argument_of_periastron_deg":[174,9]},"host_mass_solar":1.201,"inclination_deg":84.4,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.892,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5710,"orbital_period_days":3.6849729,"transit_midpoint_bjd":2458411.90651,"equilibrium_temperature_k":1526,"argument_of_periastron_deg":276},"designations":[{"catalog":"Exoplanet","designation":"TOI-954 b"},{"catalog":"Host star","designation":"TOI-954"}],"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."}