{"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":"2026-09-08T04:50:13.351Z","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":"hats-57-b","name":"HATS-57 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":911.5581522616404,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":60.9482779,"dec_deg":-19.0568182,"epoch_ra_deg":61.247803,"epoch_dec_deg":-18.982497,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-57","semi_major_axis_km":5225453.623551,"periapsis_km":null,"mass_kg":5.973428054933162e+27,"mass_msun":0.00300412,"constellation":"Eridanus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hats-57-b","radius_km":81429.52798310001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-57","host_v_mag":12.333,"uncertainties":{"mass_kg":[1.3856379027966979e+26,1.3856379027966979e+26],"radius_km":[2001.7794412000003,2001.7794412000003],"distance_ly":[9.947769520360673,10.16955585720806],"host_mass_solar":[0.026,0.019],"inclination_deg":[0.4,0.4],"host_radius_solar":[0.011,0.011],"host_temperature_k":[19,19],"semi_major_axis_km":[44879.361209999995,31415.552847],"orbital_period_days":[0.0000013,0.0000013]},"host_mass_solar":1.026,"inclination_deg":87.88,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.96,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":5587,"orbital_period_days":2.350621,"transit_midpoint_bjd":2457778.49589,"eccentricity_upper_limit":0.028,"equilibrium_temperature_k":1413.4},"designations":[{"catalog":"Exoplanet","designation":"HATS-57 b"},{"catalog":"Host star","designation":"HATS-57"}],"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."}