{"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":"2026-09-07T11:45:25.846Z","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":"hat-p-45-b","name":"HAT-P-45 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":974.0334064132825,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":274.3732697,"dec_deg":-3.3810594,"epoch_ra_deg":274.726332,"epoch_dec_deg":-3.371488,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-45","semi_major_axis_km":6761823.755639999,"periapsis_km":null,"mass_kg":1.6930618131759137e+27,"mass_msun":0.000851465,"constellation":"Serpens","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hat-p-45-b","radius_km":101947.55040000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-45","host_v_mag":12.783,"eccentricity":0.049,"uncertainties":{"mass_kg":[1.8790828979218793e+26,2.6003416113150443e+26],"radius_km":[6218.6475,12513.8322],"distance_ly":[18.920331471348288,19.670491140096793],"eccentricity":[0.063,0.063],"host_mass_solar":[0.058,0.058],"inclination_deg":[0.9,0.9],"host_radius_solar":[0.072,0.155],"host_temperature_k":[100,100],"semi_major_axis_km":[104718.50949,104718.50949],"orbital_period_days":[0.000021,0.000021],"argument_of_periastron_deg":[98,98]},"host_mass_solar":1.259,"inclination_deg":87.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.319,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":6330,"orbital_period_days":3.128992,"transit_midpoint_bjd":2455729.98612,"equilibrium_temperature_k":1652,"argument_of_periastron_deg":146},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-45 b"},{"catalog":"Host star","designation":"HAT-P-45"}],"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."}