{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T04:45:07.695Z","years_from_j2000":26.671,"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-94574","name":"HD 94574","class":"f4v_yellow_white_main_sequence_star","category":"star","object_type":"F4V yellow-white main-sequence star","mag":8.61,"mag_band":"V","abs_mag":2.807,"abs_mag_band":"V","distance_ly":472.00633439136135,"distance_method":"parallax","ra_deg":164.21101499999997,"dec_deg":70.010716,"epoch_ra_deg":164.67061,"epoch_dec_deg":69.867146,"epoch_moved_arcsec":0.749,"pm_ra_mas_yr":-14.18,"pm_dec_mas_yr":-24.26,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-94574","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1762962500,"mass_solar":1.46,"radius_solar":1.769,"spectral_type":"F4V","color_index_bv":0.402,"luminosity_solar":6.564475019516994,"radial_velocity_km_s":-11,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":4.033,"surface_temperature_k":6780,"proper_motion_ra_mas_yr":-14.18,"proper_motion_dec_mas_yr":-24.26,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.9753},"designations":[{"catalog":"HD","designation":"HD 94574"},{"catalog":"HIP","designation":"HIP 53514"}],"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."}