{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T09:47:23.524Z","years_from_j2000":26.669,"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-489","name":"HD 489","class":"g3v_yellow_main_sequence_star","category":"star","object_type":"G3V yellow main-sequence star","mag":7.94,"mag_band":"V","abs_mag":3.774,"abs_mag_band":"V","distance_ly":222.1773983442679,"distance_method":"parallax","ra_deg":2.3672700000000004,"dec_deg":19.115793,"epoch_ra_deg":2.714954,"epoch_dec_deg":19.265503,"epoch_moved_arcsec":7.452,"pm_ra_mas_yr":276.8,"pm_dec_mas_yr":38.24,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-489","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00095+1907","companions":[{"measured":2018,"magnitude":9.98,"components":null,"discoverer_code":"COU 247","separation_arcsec":0.3,"position_angle_deg":205}],"spectral_type":"G3V","uncertainties":{"metallicity_fe_h":[0.067,0.067]},"color_index_bv":0.66,"luminosity_solar":2.694014941063668,"metallicity_fe_h":-0.01,"radial_velocity_km_s":-29,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":3.99,"surface_temperature_k":5698,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":276.8,"proper_motion_dec_mas_yr":38.24,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 489"},{"catalog":"HIP","designation":"HIP 768"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}