{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T22:37:29.033Z","years_from_j2000":26.665,"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-52145","name":"HD 52145","class":"k1iii_orange_giant","category":"star","object_type":"K1III orange giant","mag":7.42,"mag_band":"V","abs_mag":1.56,"abs_mag_band":"V","distance_ly":484.6305431472656,"distance_method":"parallax","ra_deg":105.772875,"dec_deg":54.174069,"epoch_ra_deg":106.31619,"epoch_dec_deg":54.135058,"epoch_moved_arcsec":0.816,"pm_ra_mas_yr":-29.27,"pm_dec_mas_yr":8.97,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-52145","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"07031+5410","age_years":413494320,"companions":[{"measured":2022,"magnitude":9.4,"components":"AB","discoverer_code":"STF1001","separation_arcsec":9,"position_angle_deg":67},{"measured":2019,"magnitude":9.2,"components":"A,BC","discoverer_code":"WNO  18","separation_arcsec":9.3,"position_angle_deg":63},{"measured":2022,"magnitude":9.31,"components":"AC","discoverer_code":"STF1001","separation_arcsec":9.8,"position_angle_deg":59}],"mass_solar":2.901,"radius_solar":10.496,"spectral_type":"K1III","color_index_bv":0.949,"luminosity_solar":20.701413487910415,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1960AJ.....65...60S, quality C)","surface_gravity_log_g":2.621,"surface_temperature_k":4878,"proper_motion_ra_mas_yr":-29.27,"proper_motion_dec_mas_yr":8.97,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":59.2191},"designations":[{"catalog":"HD","designation":"HD 52145"},{"catalog":"HIP","designation":"HIP 33985"}],"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."}