{"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":"2026-09-08T00:06:15.795Z","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-37-a-b","name":"HATS-37 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":691.1123181266706,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":199.80183,"dec_deg":-22.9868431,"epoch_ra_deg":200.166945,"epoch_dec_deg":-23.128213,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-37 A","semi_major_axis_km":7349743.387491,"periapsis_km":null,"mass_kg":1.8791527722859326e+26,"mass_msun":0.0000945053,"constellation":"Hydra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hats-37-a-b","radius_km":43324.2264774,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-37 A","host_v_mag":12.341,"eccentricity":0,"uncertainties":{"mass_kg":[7.972163276364562e+25,7.972163276364562e+25],"radius_km":[1143.8739664000002,1143.8739664000002],"distance_ly":[8.913853802998599,9.142163267400317],"host_mass_solar":[0.012,0.017],"inclination_deg":[0.45,0.45],"host_radius_solar":[0.012,0.019],"host_temperature_k":[44,44],"semi_major_axis_km":[34407.510260999996,49367.297330999994],"orbital_period_days":[0.0000041,0.0000041]},"host_mass_solar":0.843,"inclination_deg":89.33,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.877,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":5326,"orbital_period_days":4.3315366,"transit_midpoint_bjd":2458006.80145,"equilibrium_temperature_k":1085},"designations":[{"catalog":"Exoplanet","designation":"HATS-37 A b"},{"catalog":"Host star","designation":"HATS-37 A"}],"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."}