{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T05:32:02.084Z","years_from_j2000":26.68,"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":"hat-p-64-b","name":"HAT-P-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":2126.203641644119,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.9743955,"dec_deg":2.4312732,"epoch_ra_deg":69.324554,"epoch_dec_deg":2.486644,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-64","semi_major_axis_km":8058837.294609,"periapsis_km":null,"mass_kg":1.1009122678588978e+27,"mass_msun":0.000553665,"constellation":"Taurus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hat-p-64-b","radius_km":121750.875650553,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-64","host_v_mag":12.855,"uncertainties":{"mass_kg":[2.4675619796837367e+26,3.4166242795620975e+26],"radius_km":[5004.4399925650005,5004.4399925650005],"distance_ly":[48.03631131012197,50.270482497481666],"host_mass_solar":[0.021,0.021],"inclination_deg":[0.7,0.7],"host_radius_solar":[0.028,0.041],"host_temperature_k":[29,29],"semi_major_axis_km":[44879.361209999995,44879.361209999995],"orbital_period_days":[0.0000017,0.0000017]},"host_mass_solar":1.298,"inclination_deg":88.01,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.735,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":6457,"orbital_period_days":4.007232,"transit_midpoint_bjd":2457751.46354,"eccentricity_upper_limit":0.101,"equilibrium_temperature_k":1766},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-64 b"},{"catalog":"Host star","designation":"HAT-P-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."}