{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T09:34:45.246Z","years_from_j2000":26.686,"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":"wasp-148-b","name":"WASP-148 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":803.4960211965289,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":254.1305022,"dec_deg":44.3025361,"epoch_ra_deg":254.335008,"epoch_dec_deg":44.259661,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-148","semi_major_axis_km":12289465.078005,"periapsis_km":null,"mass_kg":5.44761760136151e+26,"mass_msun":0.000273969,"constellation":"Hercules","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/wasp-148-b","radius_km":54047.951855921005,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-148","host_v_mag":12.036,"eccentricity":0.208,"uncertainties":{"mass_kg":[3.0369993584163196e+25,4.175874117075918e+25],"radius_km":[1215.3639845270002,929.3960031750001],"distance_ly":[5.07173167349536,5.1369629490387085],"eccentricity":[0.025,0.02],"host_mass_solar":[0.052,0.03],"inclination_deg":[0.24,0.24],"host_radius_solar":[0.014,0.014],"host_temperature_k":[90,90],"semi_major_axis_km":[224396.80604999998,128654.16880199999],"orbital_period_days":[0.000043,0.000043],"argument_of_periastron_deg":[6,5]},"host_mass_solar":0.954,"inclination_deg":89.3,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.912,"planets_in_system":2,"discovery_facility":"SuperWASP-North","host_spectral_type":"G","host_temperature_k":5555,"orbital_period_days":8.803809,"periastron_epoch_bjd":2457957,"transit_midpoint_bjd":2457957.4876,"equilibrium_temperature_k":940,"argument_of_periastron_deg":60.6},"designations":[{"catalog":"Exoplanet","designation":"WASP-148 b"},{"catalog":"Host star","designation":"WASP-148"}],"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."}