{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:58:12.671Z","years_from_j2000":26.654,"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-5453","name":"HD 5453","class":"f5v_yellow_white_main_sequence_star","category":"star","object_type":"F5V yellow-white main-sequence star","mag":7.74,"mag_band":"V","abs_mag":3.492,"abs_mag_band":"V","distance_ly":230.662356510569,"distance_method":"parallax","ra_deg":14.055015,"dec_deg":-7.57729,"epoch_ra_deg":14.39559,"epoch_dec_deg":-7.432462,"epoch_moved_arcsec":4.711,"pm_ra_mas_yr":156.88,"pm_dec_mas_yr":-81.42,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-5453","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00562-0735","age_years":2944769900,"companions":[{"measured":2016,"magnitude":15,"components":"AB","discoverer_code":"NSN  62","separation_arcsec":16.4,"position_angle_deg":313}],"mass_solar":1.278,"radius_solar":1.548,"spectral_type":"F5V","color_index_bv":0.47,"luminosity_solar":3.4930113756355423,"radial_velocity_km_s":6,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.149,"surface_temperature_k":6366,"proper_motion_ra_mas_yr":156.88,"proper_motion_dec_mas_yr":-81.42,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.5113},"designations":[{"catalog":"HD","designation":"HD 5453"},{"catalog":"HIP","designation":"HIP 4385"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}