{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T15:52:46.642Z","years_from_j2000":26.686,"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-74-a-b","name":"HATS-74 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":976.476317682381,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":171.0147921,"dec_deg":-19.5569588,"epoch_ra_deg":171.350096,"epoch_dec_deg":-19.704435,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-74 A","semi_major_axis_km":3566413.2374879997,"periapsis_km":null,"mass_kg":2.771261915644812e+27,"mass_msun":0.00139371,"constellation":"Crater","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hats-74-a-b","radius_km":73779.743781048,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-74 A","host_v_mag":17.26,"uncertainties":{"mass_kg":[2.657374439659409e+26,2.657374439659409e+26],"radius_km":[1501.331965879,1501.331965879],"distance_ly":[22.390635330254437,23.444120430279515],"host_mass_solar":[0.008,0.008],"inclination_deg":[0.29,0.29],"host_radius_solar":[0.0055,0.0055],"host_temperature_k":[9.5,9.5],"semi_major_axis_km":[16455.765777,16455.765777],"orbital_period_days":[5.5e-7,5.5e-7]},"host_mass_solar":0.601,"inclination_deg":87.39,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.5758,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":3776.9,"orbital_period_days":1.73185606,"transit_midpoint_bjd":2458392.02654,"eccentricity_upper_limit":0.044,"equilibrium_temperature_k":895.1},"designations":[{"catalog":"Exoplanet","designation":"HATS-74 A b"},{"catalog":"Host star","designation":"HATS-74 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."}