{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T21:13:35.558Z","years_from_j2000":26.668,"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-471","name":"HD 471","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":7.78,"mag_band":"V","abs_mag":4.225,"abs_mag_band":"V","distance_ly":167.68971388290873,"distance_method":"parallax","ra_deg":2.3155650000000003,"dec_deg":25.281961,"epoch_ra_deg":2.662974,"epoch_dec_deg":25.430299,"epoch_moved_arcsec":6.09,"pm_ra_mas_yr":174.95,"pm_dec_mas_yr":-146.75,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-471","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00093+2517","companions":[{"measured":2021,"magnitude":11.46,"components":"AB","discoverer_code":"GIC   2","separation_arcsec":29.8,"position_angle_deg":237},{"measured":2018,"magnitude":12.4,"components":"AC","discoverer_code":"FYM 132","separation_arcsec":62.5,"position_angle_deg":162}],"spectral_type":"G0","color_index_bv":0.68,"luminosity_solar":1.7782794100389228,"radial_velocity_km_s":-5.1,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_temperature_k":5678,"proper_motion_ra_mas_yr":174.95,"proper_motion_dec_mas_yr":-146.75,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 471"},{"catalog":"HIP","designation":"HIP 754"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}