{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T20:23:18.060Z","years_from_j2000":26.654,"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-109483","name":"HD 109483","class":"g4_8_yellow_star","category":"star","object_type":"G4.8 yellow star","mag":9.04,"mag_band":"V","abs_mag":4.023,"abs_mag_band":"V","distance_ly":328.78682890302895,"distance_method":"parallax","ra_deg":188.726235,"dec_deg":27.455629,"epoch_ra_deg":189.059316,"epoch_dec_deg":27.307557,"epoch_moved_arcsec":0.355,"pm_ra_mas_yr":-9.86,"pm_dec_mas_yr":-8.96,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-109483","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12349+2727","companions":[{"measured":2014,"magnitude":9.9,"components":"Aa,Ab","discoverer_code":"GII 189","separation_arcsec":0.1,"position_angle_deg":130},{"measured":2014,"magnitude":12.1,"components":"AB","discoverer_code":"YSC  99","separation_arcsec":0.4,"position_angle_deg":277}],"spectral_type":"G4.8","color_index_bv":0.57,"luminosity_solar":2.141903990722123,"radial_velocity_km_s":-2.4,"spectral_type_source":"SIMBAD (2007AJ....134.2340K, quality D)","proper_motion_ra_mas_yr":-9.86,"proper_motion_dec_mas_yr":-8.96},"designations":[{"catalog":"HD","designation":"HD 109483"},{"catalog":"HIP","designation":"HIP 61402"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}