{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T00:44:21.698Z","years_from_j2000":26.679,"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":"hd-209426","name":"HD 209426","class":"g6v_yellow_main_sequence_star","category":"star","object_type":"G6V yellow main-sequence star","mag":8.33,"mag_band":"V","abs_mag":4.848,"abs_mag_band":"V","distance_ly":162.1055905400204,"distance_method":"parallax","ra_deg":330.970635,"dec_deg":-24.846322,"epoch_ra_deg":331.350775,"epoch_dec_deg":-24.716374,"epoch_moved_arcsec":5.657,"pm_ra_mas_yr":211.94,"pm_dec_mas_yr":6.94,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-209426","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22039-2451","companions":[{"measured":2021,"magnitude":11.68,"components":"AB","discoverer_code":"SEE 465","separation_arcsec":3.4,"position_angle_deg":170},{"measured":2011,"magnitude":9.11,"components":"AD","discoverer_code":"LDS4939","separation_arcsec":97.7,"position_angle_deg":346},{"measured":2015,"magnitude":12.61,"components":"AC","discoverer_code":"LDS6378","separation_arcsec":122.9,"position_angle_deg":148}],"mass_solar":0.873,"radius_solar":1.083,"spectral_type":"G6V","color_index_bv":0.3,"luminosity_solar":1.0018437657240258,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":4.294,"surface_temperature_k":5385,"proper_motion_ra_mas_yr":211.94,"proper_motion_dec_mas_yr":6.94,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.8278},"designations":[{"catalog":"HD","designation":"HD 209426"},{"catalog":"HIP","designation":"HIP 108923"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}