{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T09:42:10.477Z","years_from_j2000":26.675,"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-145483","name":"12 Sco","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":5.67,"mag_band":"V","abs_mag":0.827,"abs_mag_band":"V","distance_ly":303.4014257125794,"distance_method":"parallax","ra_deg":243.06684,"dec_deg":-28.417305,"epoch_ra_deg":243.482542,"epoch_dec_deg":-28.48689,"epoch_moved_arcsec":1.252,"pm_ra_mas_yr":-22.99,"pm_dec_mas_yr":-40.9,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-145483","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16123-2825","companions":[{"measured":1999,"magnitude":7.94,"components":"Aa,Ab","discoverer_code":"HUB  16","separation_arcsec":0.2,"position_angle_deg":39},{"measured":2016,"magnitude":8.13,"components":"AB","discoverer_code":"HJ 4839","separation_arcsec":3.8,"position_angle_deg":69}],"spectral_type":"B9V","color_index_bv":0.012,"luminosity_solar":40.66305463404283,"radial_velocity_km_s":-3,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_temperature_k":10715,"proper_motion_ra_mas_yr":-22.99,"proper_motion_dec_mas_yr":-40.9,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"12 Sco"},{"catalog":"HD","designation":"HD 145483"},{"catalog":"HIP","designation":"HIP 79399"},{"catalog":"HR","designation":"HR 6029"}],"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."}