{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:34:13.885Z","years_from_j2000":26.665,"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-37393","name":"HD 37393","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":7.33,"mag_band":"V","abs_mag":4.574,"abs_mag_band":"V","distance_ly":116.06992245081292,"distance_method":"parallax","ra_deg":86.623185,"dec_deg":74.610116,"epoch_ra_deg":87.5131,"epoch_dec_deg":74.618688,"epoch_moved_arcsec":6.272,"pm_ra_mas_yr":142.51,"pm_dec_mas_yr":-187.13,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Camelopardalis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-37393","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05465+7437","companions":[{"measured":2018,"magnitude":10.3,"components":"AB","discoverer_code":"YSC 148","separation_arcsec":0.1,"position_angle_deg":222},{"measured":2015,"magnitude":11,"components":"AC","discoverer_code":"RAO  37","separation_arcsec":10.9,"position_angle_deg":69}],"spectral_type":"G0","uncertainties":{"metallicity_fe_h":[0.12,0.12]},"color_index_bv":0.702,"luminosity_solar":1.2894366199598706,"metallicity_fe_h":-0.09,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.47,"surface_temperature_k":5581,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":142.51,"proper_motion_dec_mas_yr":-187.13,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 37393"},{"catalog":"HIP","designation":"HIP 27246"}],"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."}