{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T18:57:13.751Z","years_from_j2000":26.67,"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-212593","name":"4 Lac","class":"b9iab_ib_blue_white_supergiant","category":"star","object_type":"B9Iab-Ib blue-white supergiant","mag":4.55,"mag_band":"V","abs_mag":-4.643,"abs_mag_band":"V","distance_ly":2249.3544190551625,"distance_method":"parallax","ra_deg":336.12913499999996,"dec_deg":49.476392,"epoch_ra_deg":336.400069,"epoch_dec_deg":49.612274,"epoch_moved_arcsec":0.163,"pm_ra_mas_yr":-5.12,"pm_dec_mas_yr":-3.37,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lacerta","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-212593","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"B9Iab-Ib","color_index_bv":0.092,"luminosity_solar":6269.024974761646,"radial_velocity_km_s":-26,"spectral_type_source":"SIMBAD (2024A&A...690A.176N, quality C)","surface_gravity_log_g":2.1,"surface_temperature_k":9621,"proper_motion_ra_mas_yr":-5.12,"proper_motion_dec_mas_yr":-3.37,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"4 Lac"},{"catalog":"HD","designation":"HD 212593"},{"catalog":"HIP","designation":"HIP 110609"},{"catalog":"HR","designation":"HR 8541"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}