{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T20:25:29.575Z","years_from_j2000":26.665,"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-124154","name":"HD 124154","class":"b3_5iii_blue_white_giant","category":"star","object_type":"B3/5III blue-white giant","mag":8.51,"mag_band":"V","abs_mag":-1.205,"abs_mag_band":"V","distance_ly":2861.020914384833,"distance_method":"parallax","ra_deg":213.545985,"dec_deg":-64.20097,"epoch_ra_deg":214.058395,"epoch_dec_deg":-64.326479,"epoch_moved_arcsec":0.115,"pm_ra_mas_yr":-2.77,"pm_dec_mas_yr":-3.31,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-124154","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14142-6412","companions":[{"measured":2015,"magnitude":9.79,"components":null,"discoverer_code":"RSS 323","separation_arcsec":49.4,"position_angle_deg":103}],"mass_solar":4.896,"radius_solar":7.661,"spectral_type":"B3/5III","color_index_bv":0.23,"luminosity_solar":264.24087573219475,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","surface_gravity_log_g":2.974,"surface_temperature_k":7669,"proper_motion_ra_mas_yr":-2.77,"proper_motion_dec_mas_yr":-3.31,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":1044.9403},"designations":[{"catalog":"HD","designation":"HD 124154"},{"catalog":"HIP","designation":"HIP 69543"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}