{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T07:24:13.075Z","years_from_j2000":26.672,"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-40483","name":"HD 40483","class":"f6v_yellow_white_main_sequence_star","category":"star","object_type":"F6V yellow-white main-sequence star","mag":6.65,"mag_band":"V","abs_mag":2.979,"abs_mag_band":"V","distance_ly":176.87427747941223,"distance_method":"parallax","ra_deg":89.22894000000001,"dec_deg":-44.008972,"epoch_ra_deg":89.429273,"epoch_dec_deg":-44.004389,"epoch_moved_arcsec":2.552,"pm_ra_mas_yr":62.64,"pm_dec_mas_yr":72.32,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pictor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-40483","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":3069700000,"mass_solar":1.389,"radius_solar":2.045,"spectral_type":"F6V","uncertainties":{"metallicity_fe_h":[0.06,0.06]},"color_index_bv":0.521,"luminosity_solar":5.602733947937967,"metallicity_fe_h":-0.06,"radial_velocity_km_s":18.8,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":3.974,"surface_temperature_k":6128,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":62.64,"proper_motion_dec_mas_yr":72.32,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":5.2711},"designations":[{"catalog":"HD","designation":"HD 40483"},{"catalog":"HIP","designation":"HIP 28150"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}