{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T12:33:15.598Z","years_from_j2000":26.672,"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-56587","name":"HD 56587","class":"a3m_white_star","category":"star","object_type":"A3m white star","mag":8.88,"mag_band":"V","abs_mag":0.726,"abs_mag_band":"V","distance_ly":1393.830584798014,"distance_method":"parallax","ra_deg":109.71435,"dec_deg":29.100883,"epoch_ra_deg":110.136987,"epoch_dec_deg":29.052017,"epoch_moved_arcsec":0.28,"pm_ra_mas_yr":0.23,"pm_dec_mas_yr":-10.49,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-56587","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":800714100,"mass_solar":2.25,"radius_solar":3.955,"spectral_type":"A3m","color_index_bv":0.33,"luminosity_solar":44.62723707622523,"variable_mag_max":8.858,"variable_mag_min":9.228,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1987ATsir1515....2B, quality D)","surface_gravity_log_g":3.554,"surface_temperature_k":7203,"proper_motion_ra_mas_yr":0.23,"proper_motion_dec_mas_yr":-10.49,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":42.4295},"designations":[{"catalog":"HD","designation":"HD 56587"},{"catalog":"HIP","designation":"HIP 35428"}],"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."}