{"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":"2026-09-01T23:06:06.184Z","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-2471","name":"HD 2471","class":"a5_white_star","category":"star","object_type":"A5 white star","mag":8.12,"mag_band":"V","abs_mag":1.21,"abs_mag_band":"V","distance_ly":785.9191278449958,"distance_method":"parallax","ra_deg":7.1703149999999996,"dec_deg":37.304109,"epoch_ra_deg":7.527211,"epoch_dec_deg":37.452589,"epoch_moved_arcsec":0.238,"pm_ra_mas_yr":5.06,"pm_dec_mas_yr":-7.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-2471","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00287+3718","companions":[{"measured":2020,"magnitude":8.92,"components":"AB","discoverer_code":"A  1504","separation_arcsec":0.6,"position_angle_deg":46},{"measured":2016,"magnitude":13.5,"components":"AB,C","discoverer_code":"A  1504","separation_arcsec":7.7,"position_angle_deg":100}],"spectral_type":"A5","color_index_bv":0.228,"luminosity_solar":28.575905433749465,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","proper_motion_ra_mas_yr":5.06,"proper_motion_dec_mas_yr":-7.33},"designations":[{"catalog":"HD","designation":"HD 2471"},{"catalog":"HIP","designation":"HIP 2252"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}