{"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":"2026-09-03T10:12:11.288Z","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-83509","name":"HD 83509","class":"f7v_yellow_white_main_sequence_star","category":"star","object_type":"F7V yellow-white main-sequence star","mag":7.02,"mag_band":"V","abs_mag":3.24,"abs_mag_band":"V","distance_ly":185.94990484575834,"distance_method":"parallax","ra_deg":144.821775,"dec_deg":13.312566,"epoch_ra_deg":145.18594,"epoch_dec_deg":13.19151,"epoch_moved_arcsec":1.834,"pm_ra_mas_yr":-67.76,"pm_dec_mas_yr":11.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-83509","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09393+1319","age_years":3239295700,"companions":[{"measured":2016,"magnitude":15.05,"components":"AB","discoverer_code":"TOK 270","separation_arcsec":50.5,"position_angle_deg":131}],"mass_solar":1.362,"radius_solar":1.981,"spectral_type":"F7V","color_index_bv":0.475,"luminosity_solar":4.405548635065531,"metallicity_fe_h":-0.54,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.829,"surface_temperature_k":6112,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-67.76,"proper_motion_dec_mas_yr":11.59,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":4.8332},"designations":[{"catalog":"HD","designation":"HD 83509"},{"catalog":"HIP","designation":"HIP 47388"}],"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."}