{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T21:10:06.018Z","years_from_j2000":26.67,"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-16218","name":"HD 16218","class":"b_a_blue_white_star","category":"star","object_type":"B/A blue-white star","mag":6.66,"mag_band":"V","abs_mag":1.17,"abs_mag_band":"V","distance_ly":408.71732007731583,"distance_method":"parallax","ra_deg":39.74298,"dec_deg":62.591508,"epoch_ra_deg":40.270036,"epoch_dec_deg":62.707305,"epoch_moved_arcsec":1.267,"pm_ra_mas_yr":40.93,"pm_dec_mas_yr":-24.11,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-16218","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02390+6235","companions":[{"measured":2018,"magnitude":7.56,"components":null,"discoverer_code":"STTA 28","separation_arcsec":67.9,"position_angle_deg":148}],"spectral_type":"B/A","color_index_bv":-0.015,"luminosity_solar":29.648313895243422,"radial_velocity_km_s":1.7,"spectral_type_source":"SIMBAD (1978A&AS...32...25R, quality D)","proper_motion_ra_mas_yr":40.93,"proper_motion_dec_mas_yr":-24.11},"designations":[{"catalog":"HD","designation":"HD 16218"},{"catalog":"HIP","designation":"HIP 12346"}],"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."}