{"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":"2026-09-04T11:12:36.368Z","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-59890","name":"HD 59890","class":"g2iab_b_yellow_supergiant","category":"star","object_type":"G2Iab/b yellow supergiant","mag":4.65,"mag_band":"V","abs_mag":-3.668,"abs_mag_band":"V","distance_ly":1503.0248046501802,"distance_method":"parallax","ra_deg":112.67751000000001,"dec_deg":-30.962281,"epoch_ra_deg":112.938193,"epoch_dec_deg":-31.01812,"epoch_moved_arcsec":0.314,"pm_ra_mas_yr":-11.74,"pm_dec_mas_yr":0.84,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Puppis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-59890","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G2Iab/b","uncertainties":{"metallicity_fe_h":[0.125,0.125]},"color_index_bv":0.904,"luminosity_solar":2553.877135779325,"metallicity_fe_h":-0.045,"radial_velocity_km_s":14,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":1.52,"surface_temperature_k":5368,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-11.74,"proper_motion_dec_mas_yr":0.84,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 59890"},{"catalog":"HIP","designation":"HIP 36514"},{"catalog":"HR","designation":"HR 2881"}],"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."}