{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T05:58:25.219Z","years_from_j2000":26.666,"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":"procyon","name":"Procyon","class":"f5iv_v_dqz_yellow_white_subgiant","category":"star","object_type":"F5IV-V+DQZ yellow-white subgiant","mag":0.4,"mag_band":"V","abs_mag":2.671,"abs_mag_band":"V","distance_ly":11.461787425721798,"distance_method":"parallax","ra_deg":114.825495,"dec_deg":5.224993,"epoch_ra_deg":115.176529,"epoch_dec_deg":5.15627,"epoch_moved_arcsec":33.559,"pm_ra_mas_yr":-716.57,"pm_dec_mas_yr":-1034.58,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Minor","discovered":"Antiquity","featured":true,"url":"https://spacecatalog.org/object/procyon","radius_km":null,"radius_kind":null,"data_quality":null,"description":"One of our nearest stellar neighbours, and like Sirius, a bright star partnered with the white dwarf remains of a companion that aged faster.","properties":{"wds_id":"07393+0514","companions":[{"measured":2014,"magnitude":10.8,"components":"AB","discoverer_code":"SHB   1","separation_arcsec":3.8,"position_angle_deg":286},{"measured":2012,"magnitude":12,"components":"AD","discoverer_code":"DIC   1","separation_arcsec":116.7,"position_angle_deg":326},{"measured":2012,"magnitude":13.6,"components":"AF","discoverer_code":"SLE 439","separation_arcsec":172.3,"position_angle_deg":333},{"measured":2012,"magnitude":11.7,"components":"AC","discoverer_code":"LAM   6","separation_arcsec":180.2,"position_angle_deg":22},{"measured":2012,"magnitude":8.85,"components":"AG","discoverer_code":"SMR  11","separation_arcsec":355.7,"position_angle_deg":314},{"measured":2009,"magnitude":9.22,"components":"AE","discoverer_code":"D    29","separation_arcsec":467.4,"position_angle_deg":67}],"spectral_type":"F5IV-V+DQZ","uncertainties":{"metallicity_fe_h":[0.151,0.151]},"color_index_bv":0.432,"luminosity_solar":7.4404636619191935,"metallicity_fe_h":-0.015,"radial_velocity_km_s":-4,"spectral_type_source":"SIMBAD (2013yCat....1.2023S, quality C)","surface_gravity_log_g":4,"surface_temperature_k":6586,"metallicity_fe_h_source":"Median of 44 spectroscopic determinations in 51 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-716.57,"proper_motion_dec_mas_yr":-1034.58,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"10 Alpha CMi"},{"catalog":"Common name","designation":"Procyon"},{"catalog":"Gliese","designation":"Gl 280A"},{"catalog":"HD","designation":"HD 61421"},{"catalog":"HIP","designation":"HIP 37279"},{"catalog":"HR","designation":"HR 2943"}],"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."}