{"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":"2026-09-04T16:27:48.278Z","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-58526","name":"HD 58526","class":"g3ib_yellow_supergiant","category":"star","object_type":"G3Ib yellow supergiant","mag":5.98,"mag_band":"V","abs_mag":-1.871,"abs_mag_band":"V","distance_ly":1212.4772017834177,"distance_method":"parallax","ra_deg":111.463335,"dec_deg":-5.774961,"epoch_ra_deg":111.793191,"epoch_dec_deg":-5.827964,"epoch_moved_arcsec":0.178,"pm_ra_mas_yr":-6.02,"pm_dec_mas_yr":-2.92,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-58526","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G3Ib","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":0.901,"luminosity_solar":487.97772728648596,"metallicity_fe_h":0.08,"radial_velocity_km_s":14,"spectral_type_source":"SIMBAD (2019MNRAS.489.1533L, quality C)","surface_gravity_log_g":1.96,"surface_temperature_k":5378,"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":-6.02,"proper_motion_dec_mas_yr":-2.92,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 58526"},{"catalog":"HIP","designation":"HIP 36055"},{"catalog":"HR","designation":"HR 2833"}],"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."}