{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-09-01T00:53:35.617Z","years_from_j2000":26.665,"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":"corot-9","name":"CoRoT-9","class":"g3_v_yellow_star","category":"star","object_type":"G3 V yellow star","mag":13.637,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":1346.9606086946071,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":280.7866461,"dec_deg":6.2040783,"epoch_ra_deg":281.114588,"epoch_dec_deg":6.230192,"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/corot-9","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18431+0612","companions":[{"measured":2014,"magnitude":20.6,"components":"AB","discoverer_code":"CRT   9","separation_arcsec":4.4,"position_angle_deg":271},{"measured":2015,"magnitude":18.7,"components":"AC","discoverer_code":"CRT   9","separation_arcsec":4.6,"position_angle_deg":258},{"measured":2014,"magnitude":20.7,"components":"AD","discoverer_code":"CRT   9","separation_arcsec":5.6,"position_angle_deg":38},{"measured":2015,"magnitude":19.3,"components":"AF","discoverer_code":"CRT   9","separation_arcsec":11.1,"position_angle_deg":304},{"measured":2016,"magnitude":17.4,"components":"AE","discoverer_code":"CRT   9","separation_arcsec":12,"position_angle_deg":47},{"measured":2014,"magnitude":19.3,"components":"AG","discoverer_code":"CRT   9","separation_arcsec":12.9,"position_angle_deg":175},{"measured":2014,"magnitude":20.8,"components":"AH","discoverer_code":"CRT   9","separation_arcsec":13.1,"position_angle_deg":218},{"measured":2014,"magnitude":19.7,"components":"AI","discoverer_code":"CRT   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9","separation_arcsec":17.4,"position_angle_deg":116},{"measured":2015,"magnitude":19.6,"components":"A,Wc","discoverer_code":"CRT   9","separation_arcsec":18.3,"position_angle_deg":16},{"measured":2014,"magnitude":20.8,"components":"A,Wd","discoverer_code":"CRT   9","separation_arcsec":18.4,"position_angle_deg":341},{"measured":2015,"magnitude":18.8,"components":"AV","discoverer_code":"CRT   9","separation_arcsec":18.5,"position_angle_deg":71},{"measured":2014,"magnitude":18.6,"components":"A,Wf","discoverer_code":"CRT   9","separation_arcsec":18.5,"position_angle_deg":71},{"measured":2014,"magnitude":21.2,"components":"A,We","discoverer_code":"CRT   9","separation_arcsec":18.6,"position_angle_deg":293},{"measured":2015,"magnitude":20,"components":"A,Wg","discoverer_code":"CRT   9","separation_arcsec":20,"position_angle_deg":134}],"mass_solar":0.96,"radius_solar":0.96,"spectral_type":"G3 V","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"stars_in_system":2,"metallicity_fe_h":-0.02,"planets_in_system":1,"surface_gravity_log_g":4.35,"surface_temperature_k":5625,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","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":"2026-08-30T09:56:50.739Z","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."}