{"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":"2026-08-31T18:09:05.211Z","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":"hd-220413","name":"HD 220413","class":"a5iv_white_subgiant","category":"star","object_type":"A5IV white subgiant","mag":8.34,"mag_band":"V","abs_mag":2.022,"abs_mag_band":"V","distance_ly":598.4519435300992,"distance_method":"parallax","ra_deg":350.929725,"dec_deg":-28.583282,"epoch_ra_deg":351.287625,"epoch_dec_deg":-28.435988,"epoch_moved_arcsec":0.429,"pm_ra_mas_yr":16.05,"pm_dec_mas_yr":-0.96,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-220413","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23237-2835","companions":[{"measured":2018,"magnitude":9.59,"components":null,"discoverer_code":"HDS3330","separation_arcsec":0.3,"position_angle_deg":226}],"spectral_type":"A5IV","color_index_bv":0.231,"luminosity_solar":13.526953590130388,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","proper_motion_ra_mas_yr":16.05,"proper_motion_dec_mas_yr":-0.96},"designations":[{"catalog":"HD","designation":"HD 220413"},{"catalog":"HIP","designation":"HIP 115490"}],"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."}