{"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":"2026-09-07T03:54:41.338Z","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-48-a-b","name":"HATS-48 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":859.7775657353301,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.6720048,"dec_deg":-59.5793505,"epoch_ra_deg":289.258194,"epoch_dec_deg":-59.532913,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-48 A","semi_major_axis_km":5638343.746683,"periapsis_km":null,"mass_kg":4.612465895610926e+26,"mass_msun":0.000231968,"constellation":"Pavo","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hats-48-a-b","radius_km":57193.69832,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-48 A","host_v_mag":14.226,"uncertainties":{"mass_kg":[5.694402340260402e+25,4.175895049524295e+25],"radius_km":[1072.3818435,1072.3818435],"distance_ly":[5.378318668549099,5.443549944092448],"host_mass_solar":[0.0066,0.0066],"inclination_deg":[0.18,0.18],"host_radius_solar":[0.0038,0.0038],"host_temperature_k":[18,23],"semi_major_axis_km":[16455.765777,16455.765777],"orbital_period_days":[0.0000037,0.0000037]},"host_mass_solar":0.7279,"inclination_deg":89.58,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.7152,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":4546,"orbital_period_days":3.1316666,"transit_midpoint_bjd":2457100.55022,"eccentricity_upper_limit":0.162,"equilibrium_temperature_k":954.6},"designations":[{"catalog":"Exoplanet","designation":"HATS-48 A b"},{"catalog":"Host star","designation":"HATS-48 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."}