{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T01:31:30.860Z","years_from_j2000":26.676,"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-89-b","name":"WASP-89 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":948.9389347117564,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":313.9000261,"dec_deg":-18.9714084,"epoch_ra_deg":314.281512,"epoch_dec_deg":-18.869013,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-89","semi_major_axis_km":6387829.07889,"periapsis_km":null,"mass_kg":1.119899126917879e+28,"mass_msun":0.00563213,"constellation":"Capricornus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/wasp-89-b","radius_km":74351.80781600002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-89","host_v_mag":13.21,"eccentricity":0.193,"uncertainties":{"mass_kg":[7.592536453680537e+26,7.592536453680537e+26],"radius_km":[2859.684916,2859.684916],"distance_ly":[8.626836190607863,8.780129688134734],"eccentricity":[0.009,0.009],"host_mass_solar":[0.08,0.08],"inclination_deg":[0.5,0.5],"host_radius_solar":[0.03,0.03],"host_temperature_k":[90,90],"semi_major_axis_km":[179517.44483999998,179517.44483999998],"orbital_period_days":[0.0000025,0.0000025],"argument_of_periastron_deg":[4,4]},"host_mass_solar":0.92,"inclination_deg":89.4,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.88,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"K3","host_temperature_k":5130,"orbital_period_days":3.3564227,"transit_midpoint_bjd":2456207.02114,"equilibrium_temperature_k":1120,"argument_of_periastron_deg":28},"designations":[{"catalog":"Exoplanet","designation":"WASP-89 b"},{"catalog":"Host star","designation":"WASP-89"}],"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."}