{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:24:39.217Z","years_from_j2000":26.685,"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":"ds-tuc-a-b","name":"DS Tuc A 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":143.7116754623069,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":354.9154673,"dec_deg":-69.196043,"epoch_ra_deg":355.299233,"epoch_dec_deg":-69.047193,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DS Tuc A","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":2.4675743474461742e+27,"mass_msun":0.00124098,"constellation":"Tucana","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/ds-tuc-a-b","radius_km":36355.170000000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DS Tuc A","host_v_mag":8.17,"eccentricity":0,"uncertainties":{"radius_km":[1084.277,1084.277],"distance_ly":[0.22537405700226967,0.22602636975770318],"host_mass_solar":[0.06,0.06],"inclination_deg":[0.41,0.34],"host_radius_solar":[0.029,0.029],"host_temperature_k":[80,80],"orbital_period_days":[0.000011,0.000011]},"host_mass_solar":1.01,"inclination_deg":89.5,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.964,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G6 V","host_temperature_k":5428,"orbital_period_days":8.138268,"periastron_epoch_bjd":2458332.30997,"transit_midpoint_bjd":2458332.30997,"equilibrium_temperature_k":850},"designations":[{"catalog":"Exoplanet","designation":"DS Tuc A b"},{"catalog":"Host star","designation":"DS Tuc A"}],"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."}