{"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":"2026-09-02T14:52:58.912Z","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-111990","name":"HD 111990","class":"b1_5i_blue_white_supergiant","category":"star","object_type":"B1.5I+ blue-white supergiant","mag":6.78,"mag_band":"V","abs_mag":-3.177,"abs_mag_band":"V","distance_ly":3197.6116869374905,"distance_method":"parallax","ra_deg":193.499175,"dec_deg":-60.33542,"epoch_ra_deg":193.901514,"epoch_dec_deg":-60.481199,"epoch_moved_arcsec":0.137,"pm_ra_mas_yr":-4.94,"pm_dec_mas_yr":-1.46,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Crux","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-111990","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12540-6020","companions":[{"measured":2019,"magnitude":13.2,"components":null,"discoverer_code":"B   805","separation_arcsec":4.6,"position_angle_deg":258}],"spectral_type":"B1.5I+","uncertainties":{"metallicity_fe_h":[0.18,0.18]},"color_index_bv":0.226,"luminosity_solar":1624.800335227319,"metallicity_fe_h":0.02,"radial_velocity_km_s":-6,"spectral_type_source":"SIMBAD (2020A&A...641A..35S, quality C)","surface_gravity_log_g":2.5,"surface_temperature_k":17700,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-4.94,"proper_motion_dec_mas_yr":-1.46,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 111990"},{"catalog":"HIP","designation":"HIP 62953"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}