{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T23:56:13.103Z","years_from_j2000":26.687,"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-12427","name":"HD 12427","class":"f5_yellow_white_star","category":"star","object_type":"F5 yellow-white star","mag":8.38,"mag_band":"V","abs_mag":0.892,"abs_mag_band":"V","distance_ly":1025.648957812468,"distance_method":"parallax","ra_deg":30.52476,"dec_deg":12.181307,"epoch_ra_deg":30.88521,"epoch_dec_deg":12.311026,"epoch_moved_arcsec":0.347,"pm_ra_mas_yr":-1,"pm_dec_mas_yr":-12.98,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-12427","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02021+1211","age_years":1090053300,"companions":[{"measured":2016,"magnitude":10.52,"components":null,"discoverer_code":"A  2216","separation_arcsec":1.7,"position_angle_deg":143}],"mass_solar":2.01,"radius_solar":4.362,"spectral_type":"F5","color_index_bv":0.466,"luminosity_solar":38.30010812264485,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.366,"surface_temperature_k":6424,"proper_motion_ra_mas_yr":-1,"proper_motion_dec_mas_yr":-12.98,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":25.2042},"designations":[{"catalog":"HD","designation":"HD 12427"},{"catalog":"HIP","designation":"HIP 9490"}],"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."}