{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T13:01:05.550Z","years_from_j2000":26.675,"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-221445","name":"HD 221445","class":"f7_f8vv_yellow_white_star","category":"star","object_type":"F7+F8VV yellow-white star","mag":6.8,"mag_band":"V","abs_mag":2.376,"abs_mag_band":"V","distance_ly":250.11986753601676,"distance_method":"parallax","ra_deg":353.052915,"dec_deg":7.084887,"epoch_ra_deg":353.394342,"epoch_dec_deg":7.232693,"epoch_moved_arcsec":1.537,"pm_ra_mas_yr":-23.08,"pm_dec_mas_yr":-52.79,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-221445","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23322+0705","companions":[{"measured":2024,"magnitude":7.92,"components":null,"discoverer_code":"HU  298","separation_arcsec":0.2,"position_angle_deg":291}],"spectral_type":"F7+F8VV","uncertainties":{"metallicity_fe_h":[0.012,0.012]},"color_index_bv":0.505,"luminosity_solar":9.763375665826418,"metallicity_fe_h":-0.14,"radial_velocity_km_s":-12.2,"spectral_type_source":"SIMBAD (quality E)","surface_gravity_log_g":4.4,"surface_temperature_k":6409,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-23.08,"proper_motion_dec_mas_yr":-52.79,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 221445"},{"catalog":"HIP","designation":"HIP 116164"}],"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."}