{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T20:46:58.710Z","years_from_j2000":26.668,"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":"twa-7-b","name":"TWA 7 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":110.87946985582867,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":160.6248102,"dec_deg":-33.6712596,"epoch_ra_deg":160.934478,"epoch_dec_deg":-33.811633,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TWA 7","semi_major_axis_km":7779089276.4,"periapsis_km":null,"mass_kg":6.45362363917285e+26,"mass_msun":0.000324562,"constellation":"Antlia","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/twa-7-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TWA 7","host_v_mag":11.773,"uncertainties":{"mass_kg":[1.1388747598540324e+26,1.1388747598540324e+26],"distance_ly":[0.24950962895330872,0.25048809808645894],"host_radius_solar":[0.105158,0.132279],"host_temperature_k":[107.22,124.13]},"host_mass_solar":0.46,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":0.917173,"planets_in_system":1,"discovery_facility":"James Webb Space Telescope (JWST)","host_temperature_k":3509,"equilibrium_temperature_k":316},"designations":[{"catalog":"Exoplanet","designation":"TWA 7 b"},{"catalog":"Host star","designation":"TWA 7"}],"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":"2026-08-30T09:56:50.739Z","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."}