{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:52:14.240Z","years_from_j2000":26.684,"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":"hats-50-b","name":"HATS-50 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2468.1622958612384,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":300.4280761,"dec_deg":-26.077564,"epoch_ra_deg":300.835807,"epoch_dec_deg":-26.00333,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-50","semi_major_axis_km":7548708.5555219995,"periapsis_km":null,"mass_kg":7.402723042338523e+26,"mass_msun":0.000372294,"constellation":"Sagittarius","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hats-50-b","radius_km":80786.098877,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-50","host_v_mag":14.045,"uncertainties":{"mass_kg":[1.8981341134201343e+26,1.8981341134201343e+26],"radius_km":[5361.9092175,5361.9092175],"distance_ly":[53.036288580519646,55.3748298087487],"host_mass_solar":[0.042,0.042],"inclination_deg":[0.66,0.66],"host_radius_solar":[0.06,0.06],"host_temperature_k":[110,110],"semi_major_axis_km":[89758.72241999999,89758.72241999999],"orbital_period_days":[0.0000046,0.0000046]},"host_mass_solar":1.168,"inclination_deg":87.54,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.117,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":5990,"orbital_period_days":3.8297015,"transit_midpoint_bjd":2456870.34792,"eccentricity_upper_limit":0.516,"equilibrium_temperature_k":1275.39},"designations":[{"catalog":"Exoplanet","designation":"HATS-50 b"},{"catalog":"Host star","designation":"HATS-50"}],"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."}