{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T19:28:28.852Z","years_from_j2000":26.67,"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-58972","name":"4 γ CMi","class":"k3_iiife_0_5_orange_giant","category":"star","object_type":"K3-IIIFe-0.5 orange giant","mag":4.33,"mag_band":"V","abs_mag":-0.616,"abs_mag_band":"V","distance_ly":318.2014236642321,"distance_method":"parallax","ra_deg":112.040805,"dec_deg":8.92553,"epoch_ra_deg":112.406183,"epoch_dec_deg":8.871206,"epoch_moved_arcsec":1.607,"pm_ra_mas_yr":-59.29,"pm_dec_mas_yr":10.76,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-58972","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"07282+0856","companions":[{"measured":2016,"magnitude":13.3,"components":"AB","discoverer_code":"LAM   4","separation_arcsec":26.9,"position_angle_deg":232},{"measured":2016,"magnitude":14.1,"components":"AE","discoverer_code":"DAL  54","separation_arcsec":31.2,"position_angle_deg":359},{"measured":2016,"magnitude":12.27,"components":"AC","discoverer_code":"LAM   4","separation_arcsec":114,"position_angle_deg":261},{"measured":2006,"magnitude":10.75,"components":"AD","discoverer_code":"WAL  52","separation_arcsec":138.2,"position_angle_deg":290},{"measured":2016,"magnitude":13.6,"components":"AF","discoverer_code":"DAL  54","separation_arcsec":153.1,"position_angle_deg":292},{"measured":2016,"magnitude":14.45,"components":"AH","discoverer_code":"DAL  54","separation_arcsec":171.6,"position_angle_deg":198}],"spectral_type":"K3-IIIFe-0.5","color_index_bv":1.425,"luminosity_solar":153.6031068385027,"metallicity_fe_h":-0.37,"radial_velocity_km_s":47,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":1.82,"surface_temperature_k":4000,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-59.29,"proper_motion_dec_mas_yr":10.76,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"4 Gamma CMi"},{"catalog":"HD","designation":"HD 58972"},{"catalog":"HIP","designation":"HIP 36284"},{"catalog":"HR","designation":"HR 2854"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}