{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:09:18.119Z","years_from_j2000":26.664,"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-4271","name":"HD 4271","class":"f7_8v_yellow_white_main_sequence_star","category":"star","object_type":"F7/8V yellow-white main-sequence star","mag":7.01,"mag_band":"V","abs_mag":3.926,"abs_mag_band":"V","distance_ly":134.94263509101455,"distance_method":"parallax","ra_deg":11.295660000000002,"dec_deg":0.25328,"epoch_ra_deg":11.641738,"epoch_dec_deg":0.399825,"epoch_moved_arcsec":7.168,"pm_ra_mas_yr":263.71,"pm_dec_mas_yr":-52.28,"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-4271","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00452+0015","companions":[{"measured":1928,"magnitude":7.8,"components":"Aa,Ab","discoverer_code":"OCC  61","separation_arcsec":0.1,"position_angle_deg":-1},{"measured":2015,"magnitude":13.85,"components":"AB","discoverer_code":"LDS 836","separation_arcsec":55.4,"position_angle_deg":45}],"spectral_type":"F7/8V","uncertainties":{"metallicity_fe_h":[0.041,0.041]},"color_index_bv":0.537,"luminosity_solar":2.3420706947938243,"metallicity_fe_h":0.02,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.28,"surface_temperature_k":6173,"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":263.71,"proper_motion_dec_mas_yr":-52.28,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 4271"},{"catalog":"HIP","designation":"HIP 3540"}],"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."}