{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T17:09:01.815Z","years_from_j2000":26.667,"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","name":"HAT-P-45","class":"star","category":"star","object_type":null,"mag":12.783,"mag_band":"V","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":274.726059,"epoch_dec_deg":-3.37151,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hat-p-45","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18175-0323","companions":[{"measured":2015,"magnitude":21.6,"components":"A,Wa","discoverer_code":"HTP  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45","separation_arcsec":12.7,"position_angle_deg":216},{"measured":2015,"magnitude":18.1,"components":"A,Xa","discoverer_code":"HTP  45","separation_arcsec":13.3,"position_angle_deg":221},{"measured":2014,"magnitude":21.3,"components":"AV","discoverer_code":"HTP  45","separation_arcsec":14,"position_angle_deg":243},{"measured":2015,"magnitude":21.1,"components":"AR","discoverer_code":"HTP  45","separation_arcsec":14.7,"position_angle_deg":267},{"measured":2015,"magnitude":20.1,"components":"AH","discoverer_code":"HTP  45","separation_arcsec":14.8,"position_angle_deg":175},{"measured":2014,"magnitude":21.9,"components":"A,Wg","discoverer_code":"HTP  45","separation_arcsec":15.8,"position_angle_deg":284},{"measured":2015,"magnitude":21,"components":"AS","discoverer_code":"HTP  45","separation_arcsec":15.9,"position_angle_deg":337},{"measured":2015,"magnitude":18,"components":"AB","discoverer_code":"HTP  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45","separation_arcsec":18.2,"position_angle_deg":270},{"measured":2015,"magnitude":20.4,"components":"AL","discoverer_code":"HTP  45","separation_arcsec":19.1,"position_angle_deg":305},{"measured":2015,"magnitude":21.5,"components":"A,Xc","discoverer_code":"HTP  45","separation_arcsec":21.4,"position_angle_deg":44},{"measured":2015,"magnitude":20.6,"components":"A,Xd","discoverer_code":"HTP  45","separation_arcsec":23.8,"position_angle_deg":51},{"measured":2015,"magnitude":19.9,"components":"A,Xe","discoverer_code":"HTP  45","separation_arcsec":24.3,"position_angle_deg":249},{"measured":2015,"magnitude":20.5,"components":"A,Xf","discoverer_code":"HTP  45","separation_arcsec":24.8,"position_angle_deg":311},{"measured":2015,"magnitude":19,"components":"A,Xg","discoverer_code":"HTP  45","separation_arcsec":25.5,"position_angle_deg":41},{"measured":2015,"magnitude":19.4,"components":"A,Xh","discoverer_code":"HTP  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Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-08-30T09:56:50.739Z","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."}