{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T18:38:19.431Z","years_from_j2000":26.673,"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-151-b","name":"WASP-151 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1477.8112858707873,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":349.0634651,"dec_deg":0.3066895,"epoch_ra_deg":349.407327,"epoch_dec_deg":0.453126,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-151","semi_major_axis_km":8227882.888499999,"periapsis_km":null,"mass_kg":5.9980737351117935e+26,"mass_msun":0.000301652,"constellation":"Pisces","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/wasp-151-b","radius_km":84861.00376002901,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-151","host_v_mag":12.821,"eccentricity":0,"uncertainties":{"mass_kg":[5.884186261037484e+25,5.884186261037484e+25],"radius_km":[1501.331965879,1501.331965879],"distance_ly":[31.41864386545389,32.785239088087046],"host_mass_solar":[0.049,0.049],"inclination_deg":[0.14,0.14],"host_radius_solar":[0.02,0.02],"host_temperature_k":[57,57],"semi_major_axis_km":[125662.211388,125662.211388],"orbital_period_days":[0.0000023,0.0000023],"argument_of_periastron_deg":[30,120]},"host_mass_solar":1.081,"inclination_deg":88.25,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.181,"planets_in_system":1,"discovery_facility":"SuperWASP-South","host_spectral_type":"G1","host_temperature_k":5871,"orbital_period_days":4.5334775,"transit_midpoint_bjd":2457763.676241,"equilibrium_temperature_k":1312,"argument_of_periastron_deg":-50},"designations":[{"catalog":"Exoplanet","designation":"WASP-151 b"},{"catalog":"Host star","designation":"WASP-151"}],"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."}