{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:27:00.243Z","years_from_j2000":26.682,"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-52-b","name":"HATS-52 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1810.6049458740665,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":140.0875894,"dec_deg":-31.2692116,"epoch_ra_deg":140.372514,"epoch_dec_deg":-31.382705,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-52","semi_major_axis_km":3736954.8100859993,"periapsis_km":null,"mass_kg":4.2518204140611007e+27,"mass_msun":0.0021383,"constellation":"Pyxis","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hats-52-b","radius_km":98802.1138478,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-52","host_v_mag":13.844,"uncertainties":{"mass_kg":[2.8472011701302012e+26,2.8472011701302012e+26],"radius_km":[6148.3225694,6148.3225694],"distance_ly":[19.75529179830315,19.75529179830315],"host_mass_solar":[0.054,0.054],"inclination_deg":[1.1,1.1],"host_radius_solar":[0.058,0.058],"host_temperature_k":[150,150],"semi_major_axis_km":[59839.14828,59839.14828],"orbital_period_days":[9.4e-7,9.4e-7]},"host_mass_solar":1.111,"inclination_deg":84.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.046,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":6010,"orbital_period_days":1.36665436,"transit_midpoint_bjd":2456929.03039,"eccentricity_upper_limit":0.246,"equilibrium_temperature_k":1834},"designations":[{"catalog":"Exoplanet","designation":"HATS-52 b"},{"catalog":"Host star","designation":"HATS-52"}],"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."}