{"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":"2026-09-02T19:28:50.393Z","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-150258","name":"HD 150258","class":"f7iv_v_yellow_white_subgiant","category":"star","object_type":"F7IV/V yellow-white subgiant","mag":6.72,"mag_band":"V","abs_mag":2.623,"abs_mag_band":"V","distance_ly":215.14285758967316,"distance_method":"parallax","ra_deg":250.00745999999998,"dec_deg":-6.081258,"epoch_ra_deg":250.366234,"epoch_dec_deg":-6.134821,"epoch_moved_arcsec":2.741,"pm_ra_mas_yr":-28.79,"pm_dec_mas_yr":-98.66,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-150258","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16400-0605","companions":[{"measured":2016,"magnitude":14.93,"components":"AB","discoverer_code":"TOK 305","separation_arcsec":179.2,"position_angle_deg":40}],"spectral_type":"F7IV/V","uncertainties":{"metallicity_fe_h":[0.055,0.055]},"color_index_bv":0.548,"luminosity_solar":7.776783344557054,"metallicity_fe_h":-0.045,"radial_velocity_km_s":-6.8,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":3.82,"surface_temperature_k":6118,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-28.79,"proper_motion_dec_mas_yr":-98.66,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 150258"},{"catalog":"HIP","designation":"HIP 81608"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}