{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T04:11:50.981Z","years_from_j2000":26.671,"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-41","name":"HAT-P-41","class":"star","category":"star","object_type":null,"mag":11.365,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":1135.6275837530432,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.3226523,"dec_deg":4.6724124,"epoch_ra_deg":297.655685,"epoch_dec_deg":4.739372,"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":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hat-p-41","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19493+0440","companions":[{"measured":2014,"magnitude":15.3,"components":"AC","discoverer_code":"HTP  41","separation_arcsec":1,"position_angle_deg":190},{"measured":2016,"magnitude":15.1,"components":"AB","discoverer_code":"WOL   7","separation_arcsec":3.6,"position_angle_deg":184},{"measured":2014,"magnitude":22.9,"components":"AD","discoverer_code":"HTP  41","separation_arcsec":5.7,"position_angle_deg":72},{"measured":2016,"magnitude":18.9,"components":"AF","discoverer_code":"HTP  41","separation_arcsec":7.8,"position_angle_deg":231},{"measured":2015,"magnitude":21.8,"components":"AE","discoverer_code":"HTP  41","separation_arcsec":7.9,"position_angle_deg":39},{"measured":2016,"magnitude":20.7,"components":"AG","discoverer_code":"HTP  41","separation_arcsec":10.1,"position_angle_deg":56},{"measured":2014,"magnitude":21,"components":"AH","discoverer_code":"HTP  41","separation_arcsec":12.7,"position_angle_deg":163},{"measured":2016,"magnitude":20.6,"components":"AI","discoverer_code":"HTP  41","separation_arcsec":15.3,"position_angle_deg":285},{"measured":2016,"magnitude":19.7,"components":"AJ","discoverer_code":"HTP  41","separation_arcsec":17,"position_angle_deg":219},{"measured":2016,"magnitude":21.3,"components":"AT","discoverer_code":"HTP  41","separation_arcsec":18.3,"position_angle_deg":138},{"measured":2016,"magnitude":20.8,"components":"AK","discoverer_code":"HTP  41","separation_arcsec":19,"position_angle_deg":329},{"measured":2016,"magnitude":20.1,"components":"AL","discoverer_code":"HTP  41","separation_arcsec":19.4,"position_angle_deg":210},{"measured":2016,"magnitude":17.7,"components":"AM","discoverer_code":"HTP  41","separation_arcsec":20.1,"position_angle_deg":246},{"measured":2016,"magnitude":20.1,"components":"AU","discoverer_code":"HTP  41","separation_arcsec":20.4,"position_angle_deg":201},{"measured":2016,"magnitude":20.1,"components":"AV","discoverer_code":"HTP  41","separation_arcsec":20.7,"position_angle_deg":246},{"measured":2016,"magnitude":16.1,"components":"AN","discoverer_code":"HTP  41","separation_arcsec":22.8,"position_angle_deg":226},{"measured":2016,"magnitude":19.4,"components":"A,Wa","discoverer_code":"HTP  41","separation_arcsec":23.2,"position_angle_deg":149},{"measured":2016,"magnitude":18.2,"components":"A,Wb","discoverer_code":"HTP  41","separation_arcsec":23.5,"position_angle_deg":221},{"measured":2016,"magnitude":19.1,"components":"AO","discoverer_code":"HTP  41","separation_arcsec":24.8,"position_angle_deg":124},{"measured":2016,"magnitude":18.4,"components":"AP","discoverer_code":"HTP  41","separation_arcsec":25.8,"position_angle_deg":334},{"measured":2016,"magnitude":19.5,"components":"AQ","discoverer_code":"HTP  41","separation_arcsec":28,"position_angle_deg":50},{"measured":2016,"magnitude":19.4,"components":"A,Wc","discoverer_code":"HTP  41","separation_arcsec":28.9,"position_angle_deg":226},{"measured":2015,"magnitude":18.7,"components":"AR","discoverer_code":"HTP  41","separation_arcsec":29,"position_angle_deg":28},{"measured":2015,"magnitude":14.8,"components":"AS","discoverer_code":"HTP  41","separation_arcsec":30.2,"position_angle_deg":332}],"mass_solar":2.56,"radius_solar":2.05,"uncertainties":{"metallicity_fe_h":[0.055,0.055]},"stars_in_system":2,"metallicity_fe_h":0.185,"planets_in_system":1,"surface_gravity_log_g":4.27,"surface_temperature_k":6390,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","stellar_parameters_method":"NASA Exoplanet Archive composite parameters"},"designations":[],"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."}