{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T07:55:37.420Z","years_from_j2000":26.683,"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-64-b","name":"HATS-64 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3522.9781139074043,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":144.2876092,"dec_deg":-29.800444,"epoch_ra_deg":144.580836,"epoch_dec_deg":-29.920779,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-64","semi_major_axis_km":9816612.275333999,"periapsis_km":null,"mass_kg":1.8222087488833287e+27,"mass_msun":0.000916415,"constellation":"Antlia","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/hats-64-b","radius_km":120035.27434910001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-64","host_v_mag":13.045,"uncertainties":{"mass_kg":[3.7962682268402685e+26,3.7962682268402685e+26],"radius_km":[5790.8619549000005,5790.8619549000005],"distance_ly":[127.98376261605013,137.8010695853241],"host_mass_solar":[0.028,0.028],"inclination_deg":[0.85,0.85],"host_radius_solar":[0.071,0.071],"host_temperature_k":[27,27],"semi_major_axis_km":[58343.16957299999,58343.16957299999],"orbital_period_days":[0.000013,0.000013]},"host_mass_solar":1.564,"inclination_deg":87.24,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":2.113,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":6554,"orbital_period_days":4.908897,"transit_midpoint_bjd":2457769.82287,"eccentricity_upper_limit":0.151,"equilibrium_temperature_k":1793},"designations":[{"catalog":"Exoplanet","designation":"HATS-64 b"},{"catalog":"Host star","designation":"HATS-64"}],"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."}