{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T17:29:28.528Z","years_from_j2000":26.673,"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-219571","name":"γ Tuc","class":"f4v_yellow_white_main_sequence_star","category":"star","object_type":"F4V yellow-white main-sequence star","mag":3.99,"mag_band":"V","abs_mag":2.176,"abs_mag_band":"V","distance_ly":75.2031806356604,"distance_method":"parallax","ra_deg":349.35747,"dec_deg":-58.235734,"epoch_ra_deg":349.748328,"epoch_dec_deg":-58.088544,"epoch_moved_arcsec":2.318,"pm_ra_mas_yr":-34.93,"pm_dec_mas_yr":79.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Tucana","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-219571","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23174-5814","companions":[{"measured":2016,"magnitude":12,"components":null,"discoverer_code":"GAT  31","separation_arcsec":4.7,"position_angle_deg":110}],"spectral_type":"F4V","uncertainties":{"metallicity_fe_h":[0.045,0.045]},"color_index_bv":0.41,"luminosity_solar":11.738159324832205,"metallicity_fe_h":-0.315,"radial_velocity_km_s":18.4,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":3.87,"surface_temperature_k":6561,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-34.93,"proper_motion_dec_mas_yr":79.59,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Gamma Tuc"},{"catalog":"Gliese","designation":"GJ 9818"},{"catalog":"HD","designation":"HD 219571"},{"catalog":"HIP","designation":"HIP 114996"},{"catalog":"HR","designation":"HR 8848"}],"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."}