{"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":"2026-09-03T09:39:50.083Z","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-209965","name":"HD 209965","class":"f7v_yellow_white_main_sequence_star","category":"star","object_type":"F7V yellow-white main-sequence star","mag":7.44,"mag_band":"V","abs_mag":2.961,"abs_mag_band":"V","distance_ly":256.6139671727348,"distance_method":"parallax","ra_deg":331.77774,"dec_deg":0.570281,"epoch_ra_deg":332.121632,"epoch_dec_deg":0.701475,"epoch_moved_arcsec":2.648,"pm_ra_mas_yr":87.68,"pm_dec_mas_yr":46.56,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-209965","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22071+0034","age_years":6739781400,"companions":[{"measured":2023,"magnitude":8.41,"components":null,"discoverer_code":"STF2862","separation_arcsec":2.5,"position_angle_deg":96}],"mass_solar":1.124,"radius_solar":1.698,"spectral_type":"F7V","color_index_bv":0.564,"luminosity_solar":5.696393733411837,"metallicity_fe_h":-0.13,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.092,"surface_temperature_k":5887,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":87.68,"proper_motion_dec_mas_yr":46.56,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.1061},"designations":[{"catalog":"HD","designation":"HD 209965"},{"catalog":"HIP","designation":"HIP 109186"}],"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."}