{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:29:07.118Z","years_from_j2000":26.671,"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-221503","name":"HD 221503","class":"k6v_orange_dwarf","category":"star","object_type":"K6V orange dwarf","mag":8.59,"mag_band":"V","abs_mag":7.687,"abs_mag_band":"V","distance_ly":49.43258676312735,"distance_method":"parallax","ra_deg":353.20579499999997,"dec_deg":-16.845641,"epoch_ra_deg":353.558361,"epoch_dec_deg":-16.699034,"epoch_moved_arcsec":10.847,"pm_ra_mas_yr":343.55,"pm_dec_mas_yr":-217.65,"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-221503","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23328-1651","age_years":10337473000,"companions":[{"measured":2010,"magnitude":10.39,"components":"A,BC","discoverer_code":"LDS 816","separation_arcsec":338.2,"position_angle_deg":353}],"mass_solar":0.675,"radius_solar":0.739,"spectral_type":"K6V","color_index_bv":1.29,"luminosity_solar":0.07331620890272109,"metallicity_fe_h":0.28,"radial_velocity_km_s":0.5,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_gravity_log_g":4.484,"surface_temperature_k":4036,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":343.55,"proper_motion_dec_mas_yr":-217.65,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.1357},"designations":[{"catalog":"Gliese","designation":"Gl 898"},{"catalog":"HD","designation":"HD 221503"},{"catalog":"HIP","designation":"HIP 116215"}],"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."}