{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:53:33.263Z","years_from_j2000":26.667,"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-43318","name":"HD 43318","class":"f5v_yellow_white_main_sequence_star","category":"star","object_type":"F5V yellow-white main-sequence star","mag":5.62,"mag_band":"V","abs_mag":2.768,"abs_mag_band":"V","distance_ly":121.29266452719112,"distance_method":"parallax","ra_deg":93.89277,"dec_deg":-0.512189,"epoch_ra_deg":94.234238,"epoch_dec_deg":-0.522088,"epoch_moved_arcsec":7.188,"pm_ra_mas_yr":-158.04,"pm_dec_mas_yr":-218.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-43318","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":2779204000,"mass_solar":1.444,"radius_solar":2.21,"spectral_type":"F5V","uncertainties":{"metallicity_fe_h":[0.048,0.048]},"color_index_bv":0.506,"luminosity_solar":6.80455924994638,"metallicity_fe_h":-0.18,"radial_velocity_km_s":-37,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":3.922,"surface_temperature_k":6148,"metallicity_fe_h_source":"Median of 12 spectroscopic determinations in 13 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-158.04,"proper_motion_dec_mas_yr":-218.33,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.2325},"designations":[{"catalog":"HD","designation":"HD 43318"},{"catalog":"HIP","designation":"HIP 29716"},{"catalog":"HR","designation":"HR 2233"}],"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."}